Search

Your search keyword '"Lucien, Saviot"' showing total 60 results
Start Over Author "Lucien, Saviot" Topic 0210 nano-technology
60 results on '"Lucien, Saviot"'

1. Free Vibrations of Anisotropic Nano-Objects with Rounded or Sharp Corners

Author

Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), and Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
General Chemical Engineering, Rayleigh-Ritz variational method, 02 engineering and technology, 01 natural sciences, Article, 0103 physical sciences, Rayleigh–Ritz variational method, General Materials Science, 010306 general physics, Anisotropy, QD1-999, Physics, Superellipsoid, Plane (geometry), nanoparticle, Isotropy, Mathematical analysis, Regular polygon, 021001 nanoscience & nanotechnology, Vibration, Chemistry, Variational method, acoustic vibrations, nanowire, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Superellipse, 0210 nano-technology
Abstract

International audience; An extension of the Rayleigh–Ritz variational method to objects with superquadric and superellipsoid shapes and cylinders with cross-sections delimited by a superellipse is presented. It enables the quick calculation of the frequencies and displacements for shapes commonly observed in nano-objects. Original smooth shape variations between objects with plane, convex, and concave faces are presented. The validity of frequently used isotropic approximations for experimentally relevant vibrations is discussed. This extension is expected to facilitate the assignment of features observed with vibrational spectroscopies, in particular in the case of single-nanoparticle measurements.

Published
2021
Full Text
View/download PDF

2. Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

Author

Amira El-Sayed Mahmoud, Nadine Millot, Karim Omri, M. Echabaane, Lucien Saviot, Julien Boudon, Rafik Ben Chaabane, Université de Monastir - University of Monastir (UM), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Centre for Research on Microelectronics and Nanotechnology of Sousse | Centre de recherche en microélectronique et nanotechnologies [Sousse] (CRMN), and Université de Gabès

Subjects
Blood Glucose, Materials science, Pharmaceutical Science, Biosensing Techniques, 02 engineering and technology, 010402 general chemistry, Electrochemistry, 01 natural sciences, Article, Analytical Chemistry, lcsh:QD241-441, symbols.namesake, lcsh:Organic chemistry, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Drug Discovery, non-enzymatic sensor, Humans, Physical and Theoretical Chemistry, Fourier transform infrared spectroscopy, glucose, Electrodes, Detection limit, Cu doping, Organic Chemistry, Electrochemical Techniques, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dielectric spectroscopy, Electrochemical gas sensor, electrochemistry, Chemistry (miscellaneous), symbols, ZnO, Molecular Medicine, nanoparticles, Differential pulse voltammetry, Zinc Oxide, Cyclic voltammetry, 0210 nano-technology, Raman spectroscopy, Oxidation-Reduction, Copper, Nuclear chemistry
Abstract

Copper-doped zinc oxide nanoparticles (NPs) CuxZn1−xO (x = 0, 0.01, 0.02, 0.03, and 0.04) were synthesized via a sol-gel process and used as an active electrode material to fabricate a non-enzymatic electrochemical sensor for the detection of glucose. Their structure, composition, and chemical properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and Raman spectroscopies, and zeta potential measurements. The electrochemical characterization of the sensors was studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Cu doping was shown to improve the electrocatalytic activity for the oxidation of glucose, which resulted from the accelerated electron transfer and greatly improved electrochemical conductivity. The experimental conditions for the detection of glucose were optimized: a linear dependence between the glucose concentration and current intensity was established in the range from 1 nM to 100 μM with a limit of detection of 0.7 nM. The proposed sensor exhibited high selectivity for glucose in the presence of various interfering species. The developed sensor was also successfully tested for the detection of glucose in human serum samples.

Published
2021

3. Ligand-dependent nano-mechanical properties of CdSe nanoplatelets: calibrating nanobalances for ligand affinity monitoring

Author

Adrien Girard, Benoit Mahler, Lucien Saviot, Jérémie Margueritat, Alain Mermet, Quentin Martinet, Justine Baronnier, Tristan Albaret, Benjamin Abécassis, Luminescence (LUMINESCENCE), Institut Lumière Matière [Villeurbanne] (ILM), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Modélisation de la matière condensée et des interfaces (MMCI), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and ANR-17-EURE-0002,EIPHI,Ingénierie et Innovation par les sciences physiques, les savoir-faire technologiques et l'interdisciplinarité(2017)

Subjects
Chemical Physics (physics.chem-ph), [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Cadmium selenide, Ligand, FOS: Physical sciences, 02 engineering and technology, Crystal structure, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Colloid, chemistry.chemical_compound, symbols.namesake, chemistry, Chemical physics, Physics - Chemical Physics, Monolayer, Nano, symbols, General Materials Science, 0210 nano-technology, Raman scattering, Metallic bonding
Abstract

The influence of ligands on the low frequency vibration of different thicknesses cadmium selenide colloidal nanoplatelets is investigated using resonant low frequency Raman scattering. The strong vibration frequency shifts induced by ligand modifications as well as the sharp spectral linewidths make low frequency Raman scattering a tool of choice to follow ligand exchange as well as the nano-mechanical properties of the NPLs, as evidenced by a carboxylate to thiolate exchange study. Apart from their molecular weight, the nature of the ligands, such as the sulfur to metal bond of thiols, induces a modification of the NPLs as a whole, increasing the thickness by one monolayer. Moreover, as the weight of the ligands increases, the discrepancy between the massload model and the experimental measurements increase. These effects are all the more important when the number of layers is small and can only be explained by a modification of the longitudinal sound velocity. This modification takes its origin in a change of lattice structure of the NPLs, that reflects on its elastic properties. These nanobalances are finally used to characterize ligands affinity with the surface using binary thiols mixtures, illustrating the potential of low frequency Raman scattering to finely characterize nanocrystals surfaces., Comment: Nanoscale, Royal Society of Chemistry, 2021

Published
2021

4. In vivo protein corona on nanoparticles: does the control of all material parameters orient the biological behavior?

Author

Julien Boudon, Lionel Maurizi, Nadine Millot, Lucien Saviot, Nimisha Singh, Célia Marets, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), and Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Chemistry, General Engineering, Nanoparticle, Bioengineering, Protein Corona, Nanotechnology, 02 engineering and technology, General Chemistry, In vitro incubation, 010402 general chemistry, 021001 nanoscience & nanotechnology, Biological effect, 01 natural sciences, Atomic and Molecular Physics, and Optics, In vitro, 0104 chemical sciences, In vivo, [SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], Nanomedicine, General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 0210 nano-technology
Abstract

International audience; Nanomaterials have a huge potential in research fields from nanomedicine to medical devices. However, surface modifications of nanoparticles (NPs) and thus of their physicochemical properties failed to predict their biological behavior. This requires investigating the "missing link" at the nano-bio interface. The protein corona (PC), the set of proteins binding to the NPs surface, plays a critical role in particle recognition by the innate immune system. Still, in vitro incubation offers a limited understanding of biological interactions and fails to explain the in vivo fate. To date, several reports explained the impact of PC in vitro but its applications in the clinical field have been very limited. Furthermore, PC is often considered as a biological barrier reducing the targeting efficiency of nano vehicles. But the protein binding can actually be controlled by altering PC both in vitro and in vivo. Analyzing PC in vivo could accordingly provide a deep understanding of its biological effect and speed up the transfer to clinical applications. This review demonstrates the need for clarifications on the effect of PC in vivo and the control of its behavior by changing its physicochemical properties. It unfolds the recent in vivo developments to understand mechanisms and challenges at the nano-bio interface. Finally, it reports recent advances in the in vivo PC to overcome and control the limitations of the in vitro PC by employing PC as a boosting resource to prolong the NPs half-life, to improve their formulations and thereby to increase its use for biomedical applications.

Published
2021

5. Inelastic light scattering by long narrow gold nanocrystals: when size, shape, crystallinity and assembly matter

Author

Nicolas Goubet, Sandra Casale, Xiang Zhen Xu, Hervé Portalès, Alain Mermet, Jérémie Margueritat, Lucien Saviot, Mostapha Ariane, De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Réactivité de Surface (LRS), Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), SATT SAYENS [Dijon], Spectroscopies optiques des matériaux verres, amorphes et à nanoparticules (SOPRANO), Institut Lumière Matière [Villeurbanne] (ILM), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Luminescence (LUMINESCENCE), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), and ANR-17-EURE-0002,EIPHI,Ingénierie et Innovation par les sciences physiques, les savoir-faire technologiques et l'interdisciplinarité(2017)

Subjects
Raman scattering, Materials science, General Physics and Astronomy, Physics::Optics, 02 engineering and technology, anisotropy, 010402 general chemistry, 01 natural sciences, Molecular physics, Light scattering, Spectral line, Crystallinity, symbols.namesake, Condensed Matter::Materials Science, Physics::Atomic and Molecular Clusters, General Materials Science, Elasticity (economics), Anisotropy, plasmonic coupling, General Engineering, 021001 nanoscience & nanotechnology, eigenvibrations, 0104 chemical sciences, Nanocrystal, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanorod, gold nanocrystals, 0210 nano-technology, nanorods, nanobipyramids
Abstract

International audience; We report the synthesis of long narrow gold nanocrystals and the study of their vibrational dynamics using inelastic light scattering measurements. Rich experimental spectra are obtained for monodomain gold nanorods and pentagonal twinned bipyramids. Their assignment involves diameter-dependent non-totally symmetric vibrations which are modeled in the framework of continuum elasticity by taking into account simultaneously the size, shape and crystallinity of the nanocrystals. Light scattering by vibrations with angular momenta larger than 2 is reported. It is shown to increase with the ratio of the nanocrystals diameter to the interparticle separation. It originates from the plasmonic coupling due to the self-assembly of the nanocrystals after deposition.

Published
2020

6. Versatile and robust synthesis process for the fine control of the chemical composition and core-crystallinity of spherical core-shell Au@Ag nanoparticles

Author

Jérémie Margueritat, Nicolas Goubet, Patricia Beaunier, Lucien Saviot, Hervé Portalès, Suyeon Lee, Michael Walls, Alexa Courty, Benoît Tremblay, De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Réactivité de Surface (LRS), Luminescence (LUMINESCENCE), Institut Lumière Matière [Villeurbanne] (ILM), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), and Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Dispersity, Nanoparticle, Bioengineering, 02 engineering and technology, Discrete dipole approximation, 010402 general chemistry, 01 natural sciences, symbols.namesake, chemistry.chemical_compound, Crystallinity, Oleylamine, [CHIM]Chemical Sciences, General Materials Science, Electrical and Electronic Engineering, High-resolution transmission electron microscopy, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Chemical engineering, Mechanics of Materials, symbols, Crystallite, 0210 nano-technology, Raman spectroscopy
Abstract

Au nanoparticles (NPs) characterized by distinct surface chemistry (including dodecanethiol or oleylamine as capping agent), different sizes (∼5 and ∼10 nm) and crystallinities (polycrystalline or single crystalline), were chosen as seeds to demonstrate the versatility and robustness of our two-step core–shell Au@Ag NP synthesis process. The central component of this strategy is to solubilize the shell precursor (AgNO3) in oleylamine and to induce the growth of the shell on selected seeds under heating. The shell thickness is thus controlled by the temperature, the annealing time, the (shell precursor)/(seed) concentration ratio, seed size and crystallinity. The shell thickness is thus shown to increase with the reactant concentration and to grow faster on polycrystalline seeds. The crystalline structure and chemical composition were characterized by HRTEM, STEM-HAADF, EELS and Raman spectroscopy. The plasmonic response of Au@Ag core–shell NPs as a function of core size and shell thickness was assessed by spectrophotometry and simulated by calculations based on the discrete dipole approximation (DDA) method. Finally, the nearly monodisperse core–shell Au@Ag NPs were shown to form micrometer-scale facetted 3D fcc-ordered superlattices (SLs) after solvent evaporation and deposition on a solid substrate. These SLs are promising candidates for applications as a tunable surface-enhanced Raman scattering platform.

Published
2020

7. Phonons in Hybrid Lamellar Supercrystals

Author

Nicola Pinna, Gianvito Caputo, and Lucien Saviot

Subjects
Materials science, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Colloid, symbols.namesake, chemistry.chemical_compound, Optics, Phase (matter), Lamellar structure, Physical and Theoretical Chemistry, business.industry, Yttrium, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Characterization (materials science), General Energy, chemistry, Chemical engineering, Benzyl alcohol, symbols, 0210 nano-technology, Raman spectroscopy, business, Raman scattering
Abstract

Phonons in hybrid lamellar supercrystals are investigated by Raman scattering. Special attention is paid to low-frequency vibrations as a mean to shed some light onto the structure at the nanometer scale. In particular, little is known about the structure of the organic capping agents in supercrystals made of colloidal nanopoarticles. This is due to the fact that characterization tools such as electron microscopy and X-ray diffraction are mostly sensitive to the inorganic phase due to its larger electronic density. Raman scattering does not suffer from this limitation. In this class of materials, synthesized following the “benzyl alcohol route”, the inorganic layers are kept together by π–π conjugated interactions. Low-frequency Raman spectra have been measured for yttrium and neodymium oxide-based lamellar organic–inorganic supercrystals synthesized with three benzyl alcohol derivatives. The spectra strongly depend on the nature of both the inorganic and organic phase despite the resulting lamellar struc...

Published
2017

8. Protein–nanoparticle interaction in bioconjugated silver nanoparticles: A transmission electron microscopy and surface enhanced Raman spectroscopy study

Author

Valérie Potin, M.C. Marco de Lucas, S. Reymond-Laruinaz, and Lucien Saviot

Subjects
inorganic chemicals, Materials science, Analytical chemistry, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, 010402 general chemistry, Photochemistry, 01 natural sciences, Silver nanoparticle, symbols.namesake, health care economics and organizations, Electron energy loss spectroscopy, technology, industry, and agriculture, Surfaces and Interfaces, General Chemistry, Surface-enhanced Raman spectroscopy, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Surfaces, Coatings and Films, Transmission electron microscopy, Chemisorption, symbols, Nanomedicine, 0210 nano-technology, Raman spectroscopy
Abstract

Understanding the mechanisms of interaction between proteins and noble metal nanoparticles (NPs) is crucial to extend the use of NPs in biological applications and nanomedicine. We report the synthesis of Ag-NPs:protein bioconjugates synthesized in total absence of citrates or other stabilizing agents in order to study the NP-protein interaction. Four common proteins (lysozyme, bovine serum albumin, cytochrome-C and hemoglobin) were used in this work. Transmission electron microscopy (TEM) and surface enhanced Raman spectroscopy (SERS) were mainly used to study these bioconjugated NPs. TEM images showed Ag NPs with sizes in the 5–40 nm range. The presence of a protein layer surrounding the Ag NPs was also observed by TEM. Moreover, the composition at different points of single bioconjugated NPs was probed by electron energy loss spectroscopy (EELS). The thickness of the protein layer varies in the 3–15 nm range and the Ag NPs are a few nanometers away. This allowed to obtain an enhancement of the Raman signal of the proteins in the analysis of water suspensions of bioconjugates. SERS results showed a broadening of the Raman bands of the proteins which we attribute to the contribution of different configurations of the proteins adsorbed on the Ag NPs surface. Moreover, the assignment of an intense and sharp peak in the low-frequency range to Ag–N vibrations points to the chemisorption of the proteins on the Ag-NPs surface.

Published
2016

9. Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

Author

Elisa Torresani, Javier E. Garay, Büsra Bor, Eugene A. Olevsky, Malte Blankenburg, Gerold A. Schneider, Diletta Giuntini, Kyle Chan, Berta Domènech, Martin Müller, Meir Shachar, Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Universitat Autònoma de Barcelona (UAB), and University of Alberta

Subjects
Materials science, Iron oxide, Nanoparticle, Spark plasma sintering, Bioengineering, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Phase (matter), General Materials Science, ddc:530, Ceramic, Composite material, Physik [530], Elastic modulus, ComputingMilieux_MISCELLANEOUS, 530: Physik, General Engineering, General Chemistry, 021001 nanoscience & nanotechnology, equipment and supplies, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, chemistry, visual_art, ddc:540, visual_art.visual_art_medium, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Iron oxide nanoparticles, Superparamagnetism
Abstract

Nanoscale advances 1(8), 3139 - 3150 (2019). doi:10.1039/C9NA00222G, Nanostructured iron-oxide based materials with tailored mechanical and magnetic behavior are produced inbulk form. By applying ultra-fast heating routines via spark plasma sintering (SPS) to supercrystalline pellets,materials with an enhanced combination of elastic modulus, hardness and saturation magnetization areachieved. Supercrystallinity – namely the arrangement of the constituent nanoparticles into periodicstructures – is achieved through self-assembly of the organically-functionalized iron oxide nanoparticles.The optimization of the following SPS regime allows the control of organics' removal, necking, iron oxidephase transformations and nano-grain size retention, and thus the fine-tuning of both mechanicalproperties and magnetic response, up until the production of bulk mm-size superparamagnetic materials., Published by Royal Society of Chemistry, Cambridge

Published
2019

10. Loading of Cisplatin into Mesoporous Silica Nanoparticles: Effect of Surface Functionalization

Author

Mathieu Varache, Lucien Saviot, Frédéric Bouyer, Igor Bezverkhyy, Rémi Chassagnon, Guy Weber, Florence Baras, Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), and Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Surface Properties, Polymers, Surfactants, chemistry.chemical_element, Nanoparticle, Antineoplastic Agents, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Nanomaterials, chemistry.chemical_compound, Electrochemistry, [CHIM]Chemical Sciences, General Materials Science, Colloids, Particle Size, Spectroscopy, ComputingMilieux_MISCELLANEOUS, Molecular Structure, Surfaces and Interfaces, Mesoporous silica, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Silicon Dioxide, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, chemistry, Proteins, mesoporous silica nanomaterials, co-condensation approach, post-synthesis grafting, cisplatin, Drug delivery, Triethoxysilane, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Surface modification, Nanoparticles, Emulsions, Cisplatin, 0210 nano-technology, Platinum, Ethylene glycol, Porosity, Nuclear chemistry
Abstract

Cisplatin (cis-diaminedichloroplatinum(II), CDDP) plays a crucial role in the treatment of various malignant tumors. However, its clinical efficacy and applicability are restricted by issues of toxicity and resistance. Here, for drug delivery purposes, the outer surface of MCM-41 mesoporous silica nanoparticles (MSNs) was functionalized with poly(ethylene glycol) (Mw = 10 000 g/mol) or low-molecular-weight (Mw = 1800 g/mol) branched polyethyleneimine (PEI). Given the strong affinity of sulfur for platinum, thiol-functionalized MSNs were synthesized for comparison by co-condensation with (3-mercaptopropyl)triethoxysilane. CDDP loading was performed either by adsorption or impregnation in aqueous media without the use of dimethyl sulfoxide as a solubilizer. CDDP loading capacities obtained by impregnation were higher than those obtained by adsorption and varied from 3.9 to 16.1 wt %, depending on the functional group. Loaded nanomaterials were characterized by scanning electron microscopy, scanning transmission electron microscopy–high-angle annular dark-field, and Raman spectroscopy. Depending on the functional groups, platinum-based species were either dispersed in the nanomaterials as nanocrystals or uniformly distributed as molecular species. The spectral signature of CDDP was strongly modified when platinum species were homogeneously distributed within the nanomaterials. Preliminary drug release studies performed at 37 °C showed that the behavior of CDDP-loaded MSNs strongly depends on the nature of the present functional groups. Among the functionalization routes investigated in this paper, PEI-based functionalization showed the most promising results for further applications in controlled drug release with the absence of burst release and a sustained release over 72 h.

Published
2019

11. The mass load effect on the resonant acoustic frequencies of colloidal semiconductor nanoplatelets

Author

Mickael D. Tessier, Silvia Pedetti, Benoit Mahler, Jérémie Margueritat, Lucien Saviot, Hélène Gehan, Adrien Girard, Benoit Dubertret, Alain Mermet, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Raman frequencies, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Nanostructure, Materials science, business.industry, Analytical chemistry, 02 engineering and technology, Low frequency, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Molecular physics, Spectral line, 0104 chemical sciences, symbols.namesake, Colloid, Semiconductor, Eigen frequency, symbols, General Materials Science, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS, Raman scattering
Abstract

Resonant acoustic modes of ultrathin CdS and CdSe colloidal nanoplatelets (NPLs) with varying thicknesses were probed using low frequency Raman scattering. The spectra are dominated by an intense band ascribed to the thickness breathing mode of the 2D nanostructures. The measured Raman frequencies show strong deviations with respect to the values expected for simple bare plates, all the more so as the thickness is reduced. The deviation is shown to arise from the additional mass of the organic ligands that are bound to the free surfaces of the nanoplatelets. The calculated eigen frequencies of vibrating platelets weighed down by the mass of the organic ligands are in very good agreement with the observed experimental behaviours. This finding opens up a new possibility of nanomechanical sensing such as nanobalances.

Published
2016

12. Vibrations of single-crystal gold nanorods and nanowires

Author

Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), and Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Materials science, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanowire, FOS: Physical sciences, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Standing wave, symbols.namesake, Condensed Matter::Materials Science, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanorod, Elasticity (economics), 010306 general physics, 0210 nano-technology, Anisotropy, Raman spectroscopy, Single crystal, Raman scattering
Abstract

International audience; The vibrations of gold nanowires and nanorods are investigated numerically in the framework of continuum elasticity using the Rayleigh-Ritz variational method. Special attention is paid to identify the vibrations relevant in Raman scattering experiments. A comprehensive description of the vibrations of nanorods is proposed by determining their symmetry, comparing with standing waves in the corresponding nanowires and estimating their Raman intensity. The role of experimentally relevant parameters such as the anisotropic cubic lattice structure, the presence of faceted lateral surfaces and the shape of the ends of the nanorods is evaluated. Elastic anisotropy is shown to play a significant role contrarily to the presence of facets. Localized vibrations are found for nanorods with flat ends. Their evolution as the shape of the ends is changed to half-spheres is discussed.

Published
2018

13. Acoustic Vibrations of Core–Shell Nanospheres: Probing the Mechanical Contact at the Metal–Dielectric Interface

Author

Serge Ravaine, H. Baida, Jean Oberlé, P. Langot, Pascal Massé, Mona Tréguer-Delapierre, Noelia Vilar-Vidal, Benoît Dacosta Fernandes, Lucien Saviot, Julien Burgin, Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Paul Pascal (CRPP), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Project Nano-Trans no. # 20111101010, ANR-11-NANB-0001,DIRAN,Diagnostic d'Infections par spectroscopie Raman Amplifiée par Nanoparticules(2011), Laboratoire Ondes et Matière d'Aquitaine ( LOMA ), Université de Bordeaux ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Recherche Paul Pascal ( CRPP ), Institut de Chimie de la Matière Condensée de Bordeaux ( ICMCB ), Université de Bordeaux ( UB ) -Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] ( LICB ), Université de Technologie de Belfort-Montbeliard ( UTBM ) -Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), and ANR-11-NANB-0001/11-NANB-0001,DIRAN,Diagnostic d’Infections par spectroscopie Raman Amplifiée par Nanoparticules ( 2011 )

Subjects
Materials science, Overtone, Shell (structure), Nanoparticle, Physics::Optics, 02 engineering and technology, Dielectric, 010402 general chemistry, 01 natural sciences, Thermal conductivity, Physical and Theoretical Chemistry, Composite material, Spectroscopy, Nanoscopic scale, Acoustic vibrations, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Core (optical fiber), [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, General Energy, [ CHIM.MATE ] Chemical Sciences/Material chemistry, [ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistry, Nanoparticles, 0210 nano-technology
Abstract

International audience; The acoustic vibrations of metal−dielectric core−shell nanoparticles (Ag@SiO2 and Au@SiO2) are investigated using ultrafast pump−probe spectroscopy. The experimental results are in good agreement with calculations of the period of the breathing vibration of the core−shell particles. The transition from one overtone of the breathing mode to the next one as the size of the silica shell increases is observed for slightly thinner SiO2 shells than previously reported. Our results confirm that this optical technique permits the determination of the quality of the mechanical contact at the metal dielectric interface. This is of major importance for many applications, in particular because it modifiessignificantly the thermal conductivity at the nanoscale. Moreover, we observed that for two different synthesis routes, poor contact core−shell samples could sneak in among good sample series based on the same metallic core particles. This confirms the suitability of this all optical and noninvasive technique to obtain information hardly reachable by other means such as electron microscopy or absorption spectroscopy.

Published
2018

14. Contact laws between nanoparticles: the elasticity of a nanopowder

Author

Frédéric Demoisson, Alain Mermet, Denis Machon, Lucien Saviot, Julien Ramade, Adrien Girard, Jérémie Margueritat, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), and Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Nanoparticle, 02 engineering and technology, Elasticity (physics), 021001 nanoscience & nanotechnology, 01 natural sciences, Light scattering, Brillouin zone, Contact surfaces, Law, 0103 physical sciences, General Materials Science, Angstrom, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, Material properties, Nanoscopic scale, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; Studies of the mechanical contact between nanometer-scale particles provide fundamental insights into the mechanical properties of materials and the validity of contact laws at the nanoscale which are still under debate for contact surfaces approaching atomic dimensions. Using in situ Brillouin light scattering under high pressure, we show that effective medium theories successfully predict the macroscopic sound velocities in nanopowders if one takes into account the cementation of the contacts Our measurements suggest the relevance of the continuum approach and effective medium theories to describe the contact between nanoparticles of diameters as small as 4 nm, i.e. with radii of contact of a few angstroms. In particular, we demonstrate that the mechanical properties of nanopowders strongly depend on the surface state of the nanoparticles. The presence of molecular adsorbates modifies significantly the contact laws.

Published
2018

15. Environmental effects on the natural vibrations of nanoplatelets: a high pressure study

Author

Erwann Jeanneau, Benoit Mahler, Adrien Girard, Jérémie Margueritat, Alain Mermet, Lucien Saviot, Silvia Pedetti, Mickael D. Tessier, Hélène Gehan, Ruben Vera, Denis Machon, Benoit Dubertret, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Terahertz radiation, Analytical chemistry, 02 engineering and technology, Dissipation, Low frequency, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Core (optical fiber), Vibration, symbols.namesake, Colloid, Quality (physics), 13. Climate action, Chemical physics, symbols, General Materials Science, 0210 nano-technology, Raman spectroscopy
Abstract

International audience; Resonant acoustic modes from ultrathin CdS colloidal nanoplatelets (NPLs) are probed under high pressure using low frequency Raman spectroscopy. In particular we focus on the characterization of the recently evidenced mass load effect that is responsible for a significant downshift of the NPL breathing frequency due to the inert mass of organic ligands. We show that a key parameter in the observation of the mass effect is whether the surrounding medium is able to support THz acoustic wave propagation, at a frequency close to that of the inorganic vibrating core. At low pressures, surface organic molecules show a single particle-like behavior and a strong mass effect is observed. Upon pressure loading the ligands are compacted together with the surrounding medium and slowly turned into a solid medium that supports THz acoustic phonons. We observe a continuous transition towards a fully embedded NPL with a frequency close to that of a freely vibrating slab and a progressive loss of the mass effect. The quality factor of the detected vibration significantly decreases as a result of the appearance of a "phonon-like" behavior of the environment at the origin of damping and energy dissipation. Resonant acoustic modes arise from a structure when the phonon wavelength becomes comparable to the confinement dimension. These modes have been investigated in the past few years for various geometries of nanomaterials such as spherical metallic, 1,2 semiconducting 3,4 and dielectric NPs. 5 Low frequency Raman experiments have essentially focused on nano-objects embedded in solid environments such as glassy matrices, which aroused theoretical studies to understand the coupling with the matrix. 6,7 This coupling essentially results in a damping of the modes i.e., a broadening of the Raman peaks without significant shifting of the resonance frequency as compared to a free vibration. The damping mainly originates from energy dissipation in the matrix due to the emission of THz acoustic waves. Inorganic materials can accommodate acoustic phonons with relatively high frequencies. For instance in inorganic glass, 8 metallic, 9 CdS and CdSe systems, the maximum of acoustic phonon frequency reaches several THz at the maximum of the dispersion relations. For this reason, experimental Raman spectra of embedded NPs (position and width of the resonances) have been so far well explained by core-shell 10 or core-matrix 11 models. However, the recent finding of a mass load effect from CdS and CdSe NPLs loaded with oleic acids at their surfaces suggests that the sound propagation within the organic molecules should be neglected. This is the basis of the mass loaded model where only the inertial mass of the ligands is taken into account to explain the lowering of the NPL breathing frequencies. 12 The discovery of this effect with two-dimensional nano-objects was recently extended to QDs explaining the temperature dependence of acoustic vibrations of CdSe and CdSe-CdS core-shell nanocrystals 13 and the modulation of QD acoustic vibration frequencies through the choice of surface ligands. 14 It can also provide insights into more complex geometries such as nanorod heterostructures. 15 Resonant acoustic modes in finite size structures arise when the phonon wavelength matches the confinement dimension. In the case of nanomaterials with a 3D confinement , such as nanoparticles, breathing acoustic modes with an angular momentum ℓ = 0 have been extensively studied in particular because they are Raman active. The breathing motion of a free sphere involves a radial displacement of the surface with a frequency given by ν 3D ' 0:9=D ffiffiffiffiffiffiffiffiffiffiffiffi C 11 =ρ p where D, C 11 and ρ are the sphere diameter, elastic constant and density, respectively. 1D confinement geometries such as

Published
2017

16. Inelastic Light Scattering Contribution to the Study of the Onset of Sintering of a Nanopowder

Author

Laurent David, Adrien Girard, Frédéric Demoisson, Jérémie Margueritat, Guillaume Sudre, Alain Mermet, S. Le Gallet, Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Matériaux Polymères (IMP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Matériaux Polymères - Site Université Claude Bernard Lyon 1 ( IMP ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Jean Monnet [Saint-Étienne] ( UJM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'étude des microstructures ( LEM - ONERA - CNRS ), ONERA-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de physique des solides ( LPS ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS )

Subjects
Materials science, Sintering, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Light scattering, Spectral line, symbols.namesake, Optics, Condensed Matter::Superconductivity, Physics::Chemical Physics, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, Quasielastic scattering, Condensed matter physics, Scattering, business.industry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, [ CHIM.POLY ] Chemical Sciences/Polymers, General Energy, [CHIM.POLY]Chemical Sciences/Polymers, [ CHIM.MATE ] Chemical Sciences/Material chemistry, symbols, Experimental methods, 0210 nano-technology, business, Raman spectroscopy
Abstract

International audience; The onset of the sintering of 5 nm ZrO2 and TiO2 nanoparticles is investigated by various methods including inelastic light scattering. A special attention is paid to low-frequency Raman spectra where scattering from confined acoustic vibrations and quasielastic scattering manifest. Significant changes are observed between samples sintered at different temperatures or applied forces. A detailed analysis of the spectra enables to follow the variation of the size of the nanoparticles, the surface area, and the formation of internanoparticles necks in the sintered materials. Finally, low-frequency scattering is shown to be more sensitive to the onset of sintering than most other experimental methods.

Published
2017

17. Direct Writing on Copper Ion Doped Silica Films by Electrogeneration of Metallic Microstructures

Author

Lucien Saviot, Jackie Vigneron, Arnaud Etcheberry, Hélène Cattey, Guillaume Herlem, Tijani Gharbi, Mathieu Frégnaux, Ahmed Kandory, Nanomédecine, imagerie, thérapeutique - UFC (EA 4662) (NIT / NANOMEDECINE), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon] (ICMUB), Université de Bourgogne (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut Lavoisier de Versailles (ILV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Scientific Research and Cultural Bureau/Embassy of the Republic of Iraq in Paris, France Campus France French RENATECH network Iraqi Ministry of Higher Education, Nanomédecine, imagerie, thérapeutique - UFC ( NIT / NANOMEDECINE ), Université Bourgogne Franche-Comté ( UBFC ) -Université de Franche-Comté ( UFC ), Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon] ( ICMUB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Institut Lavoisier de Versailles ( ILV ), and Université de Versailles Saint-Quentin-en-Yvelines ( UVSQ ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Working electrode, Materials science, Inorganic chemistry, chemistry.chemical_element, Ultramicroelectrode, 02 engineering and technology, 010402 general chemistry, Electrochemistry, sol-gel process, [ CHIM ] Chemical Sciences, 01 natural sciences, Dip-coating, glasses, deposition, colored coatings, law.invention, Colloid, law, colloids, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Thin film, methyl viologen, scanning electrochemical microscope, particles, Electrolysis, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Copper, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, chemistry, [ CHIM.MATE ] Chemical Sciences/Material chemistry, coating films, nanoparticles, 0210 nano-technology
Abstract

International audience; A facile and rapid localized electrochemical reduction of colloid copper particles is proposed using the scanning electrochemical,microscope (SECM), technique. In this purpose, thin films of composite silica :glass containing copper salts were prepared by the sol-gel method via the dip coating technique. Acid-catalyzed tetraethylorthosilane (TEOS) solutions charged with copper nitrate were used as precursors. This one-pot experiment can be performed in mild conditions. The localized generation of copper metallic nanostructures on silica film has been performed by electroreduction of methyl viologen on an ultramicroelectrode (UME). The UME generates reducing species, which in turn diffuse:toward the silica matrix and reduce the metal ions. The diameter of the working electrode and the electrolysis period Were taken into account to study the size of the generated dotted micropatterns. The compositions of the modified silica films were characterized by X-ray diffraction (XRD), scanning,electronic microscopy (SEM), optical microscopy,, and vibrational (IR-ATR and Raman) and X-ray photoelectron spectroscopies (XPS).

Published
2017

18. Temperature rise during laser-induced self-organization of nanoparticle gratings revealed by Raman microspectroscopy and electron microscopy

Author

Jan Siegel, Guy Vitrant, Matthieu Bugnet, Mario Garcia-Lechuga, Nathalie Destouches, Lucien Saviot, M. Marco-De-Lucas, Z. Liu, Yaya Lefkir, Stéphanie Reynaud, Thierry Epicier, N. Destouches, Y. Lefkir, T. Epicier, Javier Solis, G. Vitrant, Laboratoire Hubert Curien [Saint Etienne] ( LHC ), Université Jean Monnet [Saint-Étienne] ( UJM ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation ( IMEP-LAHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Institut National Polytechnique de Grenoble ( INPG ) -Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Université Grenoble Alpes ( UGA ), Matériaux, ingénierie et science [Villeurbanne] ( MATEIS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
[PHYS]Physics [physics], Materials science, [ PHYS ] Physics [physics], Nanoparticle, Nanotechnology, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, 0104 chemical sciences, law.invention, Raman microspectroscopy, law, [ CHIM.MATE ] Chemical Sciences/Material chemistry, Electron microscope, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

19. Mechanical Coupling in Gold Nanoparticles Supermolecules Revealed by Plasmon-Enhanced Ultralow Frequency Raman Spectroscopy

Author

Adrien Girard, Hélène Gehan, Aurélien Crut, Jérémie Margueritat, Lucien Saviot, Alain Mermet, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), FRAMA 2013 (FédéRation André Marie Ampère), ANR-13-JS10-0002,NANOVIP,NANO-objet unique pour l'étude de l'interaction Vibration acoustique/Plasmon : vers la spectroscopie Basse Fréquence exaltée de surface(2013), Institut Lumière Matière [Villeurbanne] ( ILM ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), and ANR-13-JS10-0002,NANOVIP,NANO-objet unique pour l'étude de l'interaction Vibration acoustique/Plasmon : vers la spectroscopie Basse Fréquence exaltée de surface ( 2013 )

Subjects
Materials science, Frequency band, Lamb, Analytical chemistry, Nanoparticle, Physics::Optics, Bioengineering, 02 engineering and technology, gold NPs dimer, mechanical properties, 010402 general chemistry, 01 natural sciences, Molecular physics, Vibration, symbols.namesake, General Materials Science, Physics::Atomic Physics, Surface plasmon resonance, Raman, Plasmon, chemistry.chemical_classification, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], [ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics], Scattering, Mechanical Engineering, Brillouin, General Chemistry, Polymer, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, chemistry, Colloidal gold, symbols, 0210 nano-technology, Raman spectroscopy
Abstract

International audience; Acoustic vibrations of assemblies of gold nanoparticles were investigated using ultralow frequency micro-Raman scattering and finite element simulations. When exciting the assemblies resonantly with the surface plasmon resonance of electromagnetically coupled nano-particles, Raman spectra present an ultralow frequency band whose frequency lies below the lowest Raman active Lamb mode of single nanoparticles that was observed. This feature was ascribed to a Raman vibration mode of gold nanoparticle " supermolecules " , that is, nanoparticles mechanically coupled by surrounding polymer molecules. Its measured frequency is inversely proportional to the nanoparticle diameter and sensitive to the elastic properties of the interstitial polymer. The latter dependence as well as finite element simulations suggest that this mode corresponds to the out-of-phase semirigid translation (l = 1 Lamb mode) of each nanoparticle of a dimer inside the matrix, activated by the mechanical coupling between the nanoparticles. These observations were permitted only thanks to the resonant excitation with the coupling plasmon excitation, leading to an enhancement up to 10^4 of the scattering by these vibrations. This enhanced ultralow frequency Raman scattering thus opens a new route to probe the local elastic properties of the surrounding medium.

Published
2016

20. Raman characterization of Pb2Na1−xLaxNb5−xFexO15 and Pb0.5(5−x)LaxNb5−xFexO15 (0≤x≤1) solid solutions

Author

A. Boukhari, M. Bouziane, Mhamed Taibi, Lucien Saviot, Laboratoire de Chimie du Solide Appliqué, Université Mohammed V de Rabat [Agdal], Laboratoire de physico-Chimie des Matériaux, Associé à l'AUF (LAF 502), Rabat, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Université Mohammed 5 Agdal, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), and Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
010302 applied physics, Materials science, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Atmospheric temperature range, Tungsten, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Ferroelectricity, Spectral line, Electronic, Optical and Magnetic Materials, symbols.namesake, chemistry, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, Electrical and Electronic Engineering, 0210 nano-technology, Spectroscopy, Raman spectroscopy, Raman scattering, Solid solution
Abstract

The ferroelectric compounds Pb 2 Na 1− x La x Nb 5− x Fe x O 15 and Pb 0.5(5− x ) La x Nb 5− x Fe x O 15 (0≤ x ≤1) with the tungsten bronze type structure have been investigated using Raman spectroscopy. The evolution of the spectra as a function of composition at room temperature is reported. In the frequency range 200–1000 cm −1 three main A 1 phonons around 240 ( υ 1 ), 630 ( υ 2 ) and 816 ( υ 3 ) cm −1 were observed. The broadening of the Raman lines for high values of x originates from a significant structural disorder. This is in good agreement with the relaxor character of these compositions. The lowest-frequency part of the spectra, below 180 cm −1 , reveals a structural change in the studied solid solutions. The behaviour of the Raman shift of the υ 1 mode confirms that in Pb 2 Na 1− x La x Nb 5− x Fe x O 15 , a clear anomaly occurs in the vicinity of x =0.4.

Published
2011

21. Dielectric Properties and Raman Spectroscopy in Ca-Substituted Na0.5Bi0.5TiO3 Ferroelectric Ceramics

Author

Roy Jean Roukos, Olivier Bidault, Ludivine Minier, Julien Pansiot, and Lucien Saviot

Subjects
010302 applied physics, Diffraction, Materials science, Ferroelectric ceramics, General Engineering, Analytical chemistry, 02 engineering and technology, Dielectric, 021001 nanoscience & nanotechnology, 01 natural sciences, Piezoelectricity, Ferroelectricity, symbols.namesake, Phase (matter), 0103 physical sciences, symbols, 0210 nano-technology, Raman spectroscopy, Perovskite (structure)
Abstract

Lead free Na0.5Bi0.5TiO3(NBT) and (Na0.5Bi0.5TiO3)1-x(CaTiO3)x (NBT-CT) piezoelectric ceramics with the perovskite structure were studied. The NBT and NBT-CT samples were synthesized using a solid-state reaction method and characterized with X-ray diffraction (XRD), Raman spectroscopy and dielectric measurements for several compositions (x = 0, 0.07, 0.15) at room temperature. The XRD analysis showed a stabilization of a rhombohedral phase at a low concentration of Ca (0 < x

Published
2011

22. Crystallinity Dependence of the Plasmon Resonant Raman Scattering by Anisotropic Gold Nanocrystals

Author

Eugène Duval, Nicolas Goubet, Peng Yang, Marie-Paule Pileni, Sergey Sirotkin, Alain Mermet, Lucien Saviot, Hervé Portalès, Laboratoire des Matériaux Mésoscopiques et Nanométriques (LMMN), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Matériaux Mésoscopiques et Nanométriques ( LMMN ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS )

Subjects
Materials science, Macromolecular Substances, Surface Properties, Molecular Conformation, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Analytical chemistry, General Physics and Astronomy, 02 engineering and technology, Spectrum Analysis, Raman, 010402 general chemistry, 01 natural sciences, Molecular physics, symbols.namesake, Crystallinity, Computer Science::Systems and Control, Condensed Matter::Superconductivity, Materials Testing, Physics::Atomic and Molecular Clusters, Nanotechnology, General Materials Science, Particle Size, Surface plasmon resonance, Anisotropy, Computer Science::Distributed, Parallel, and Cluster Computing, Plasmon, General Engineering, Surface Plasmon Resonance, 021001 nanoscience & nanotechnology, Nanostructures, 0104 chemical sciences, Refractometry, Nanocrystal, Transmission electron microscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, Gold, Crystallization, 0210 nano-technology, Raman scattering, Excitation
Abstract

International audience; Au nanocrystals (NCs) with different crystalline structures and related morphologies are unselectively synthesized using an organometallic route. The acoustic vibrations of these NCs are studied by plasmon mediated low-frequency Raman scattering (LFRS). A splitting of the quadrupolar vibration mode is pointed out in the LFRS spectrum. Comparison of the measured frequencies with calculations and careful examination of the NCs morphologies by transmission electron microscopy ascertain this splitting as being an effect of crystallinity. The excitation dependence of the LFRS spectra is interpreted by the shape-selection of the NCs via plasmon−vibration coupling. These results give new insights into the crystallinity influence on both the vibrations of the NCs and their coupling with plasmons and demonstrate the relevance of elastic anisotropy in monodomain NCs.

Published
2010

23. Probing atomic ordering and multiple twinning in metal nanocrystals through their vibrations

Author

Daniel B. Murray, Marie-Paule Pileni, Nicolas Goubet, Eugène Duval, Alain Mermet, Lucien Saviot, Hervé Portalès, Sergey V. Adichtchev, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Mathematics, Statistics and Physics Unit (MSP), University of British Columbia (UBC), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
Multidisciplinary, Condensed matter physics, Chemistry, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Vibration, Crystallinity, symbols.namesake, Nanocrystal, Physical Sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, Elastic anisotropy, 0210 nano-technology, Degeneracy (mathematics), Crystal twinning, Raman spectroscopy, Raman scattering
Abstract

International audience; Control of nanocrystal (NC) crystallinity currently raises great interest because of its potential benefits in both physics modeling and technological applications. Advances in methods for synthesizing perfect single-crystalline NCs are recent, so that the effect of crystallinity on NC properties has received only limited study and still needs to be properly investigated. Here, we report that crystallinity of gold NCs dramatically modifies their vibrations. Using low-frequency Raman scattering, we clearly demonstrate that single-domain NCs vibrate differently than their multiply twinned counterparts, through the splitting of the quadrupolar vibrations, which is only observed for the former. Using the resonant ultrasound approach, we calculate the vibrational frequencies of a gold sphere and show that elastic anisotropy induces a lift of degeneracy of the quadrupolar mode in good agreement with our experimental measurements. These findings open up challenging perspectives on using Raman spectroscopy to characterize nanocrystallinity.

Published
2008

24. Damping by Bulk and Shear Viscosity of Confined Acoustic Phonons for Nanostructures in Aqueous Solution

Author

Lucien Saviot, Caleb H. Netting, Daniel B. Murray, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit (MSP), and University of British Columbia (UBC)

Subjects
Materials science, Aqueous solution, Intrinsic viscosity, Isotropy, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 02 engineering and technology, Volume viscosity, 021001 nanoscience & nanotechnology, 01 natural sciences, Viscoelasticity, Surfaces, Coatings and Films, Physics::Fluid Dynamics, Viscosity, Chemical physics, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Materials Chemistry, Compressibility, Newtonian fluid, Physical and Theoretical Chemistry, 010306 general physics, 0210 nano-technology
Abstract

International audience; A nanoparticle in aqueous solution is modeled as a homogeneous elastic isotropic continuum sphere in contact with an infinite viscous compressible Newtonian fluid. The frequencies and damping of the confined vibrational modes of the sphere are calculated for the material parameters of a CdSe nanoparticle in water and a poly(methyl methacrylate) nanosphere in water. Although the effects of viscosity are found to be negligible for macroscopic objects, for nanoscale objects, both the frequency and damping of the vibrational modes are significantly affected by the viscosity of the liquid. Furthermore, both shear viscosity and bulk viscosity play an important role. A model of the spherical satellite tobacco mosaic virus consisting of outer solid layers with a water core is also investigated, and the viscosity of the water core is found to significantly damp the free vibrational modes. The same approach can be applied for nonspherical geometries and also to viscoelastic nanoparticles.

Published
2007

25. Nanovectorization of TRAIL with single wall carbon nanotubes enhances tumor cell killing

Author

Al Batoul, Zakaria, Fabien, Picaud, Thibault, Rattier, Marc, Pudlo, Florent, Dufour, Lucien, Saviot, Rémi, Chassagnon, Jeannine, Lherminier, Tijani, Gharbi, Olivier, Micheau, Guillaume, Herlem, Nanomédecine, imagerie, thérapeutique - UFC (EA 4662) (NIT / NANOMEDECINE), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université de Franche-Comté (UFC), Lipides - Nutrition - Cancer (U866) (LNC), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Ecole Nationale Supérieure de Biologie Appliquée à la Nutrition et à l'Alimentation de Dijon (ENSBANA), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Agroécologie [Dijon], Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, ANR-11-LABX-0021-01-LipSTIC Labex, Conseil Regional de Bourgogne, ANR (SphingoDR), ANR (HSPathies), Université de Bourgogne, PRES Bourgogne Franche-Comté, CHU Jean Minjoz, Conseil Regional de Franche-Comte, ANR-13-BSV1-0029,HSPathies,Role de la proteine HSP70 dans la régulation normale et pathologique de l'érythropoièse(2013), ANR-10-BLAN-1241,SphingoDR,Sensibilisation de cellules cancéreuses résistantes aux ligands des récepteurs de mort par modulation des sphingolipides de la membrane plasmique.(2010), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Bourgogne (UB)-Ecole Nationale Supérieure de Biologie Appliquée à la Nutrition et à l'Alimentation de Dijon (ENSBANA)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Nanomédecine, imagerie, thérapeutique - UFC ( NIT / NANOMEDECINE ), Université Bourgogne Franche-Comté ( UBFC ) -Université de Franche-Comté ( UFC ), Lipides - Nutrition - Cancer (U866) ( LNC ), Université de Bourgogne ( UB ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Ecole Nationale Supérieure de Biologie Appliquée à la Nutrition et à l'Alimentation de Dijon ( ENSBANA ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, ANR-13-BSV1-0029,HSPathies,Role de la proteine HSP70 dans la régulation normale et pathologique de l'érythropoièse ( 2013 ), ANR-10-BLAN-1241,SphingoDR,Sensibilisation de cellules cancéreuses résistantes aux ligands des récepteurs de mort par modulation des sphingolipides de la membrane plasmique. ( 2010 ), Nanomédecine, imagerie, thérapeutique - UFC (UR 4662) (NIT / NANOMEDECINE), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Micheau, Olivier, Blanc 2013 - Role de la proteine HSP70 dans la régulation normale et pathologique de l'érythropoièse - - HSPathies2013 - ANR-13-BSV1-0029 - Blanc 2013 - VALID, and BLANC - Sensibilisation de cellules cancéreuses résistantes aux ligands des récepteurs de mort par modulation des sphingolipides de la membrane plasmique. - - SphingoDR2010 - ANR-10-BLAN-1241 - BLANC - VALID

Subjects
Materials science, [SDV.BIO]Life Sciences [q-bio]/Biotechnology, Stereochemistry, Carbon nanotubes, Bioengineering, TRAIL, 02 engineering and technology, TNF-Related Apoptosis-Inducing Ligand, 03 medical and health sciences, Microscopy, Electron, Transmission, Cell Line, Tumor, Neoplasms, [SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology, Humans, [CHIM]Chemical Sciences, General Materials Science, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Receptor, [ SDV.BBM ] Life Sciences [q-bio]/Biochemistry, Molecular Biology, ComputingMilieux_MISCELLANEOUS, 030304 developmental biology, Receptor Aggregation, 0303 health sciences, Nanotubes, Carbon, Mechanical Engineering, nanovector, [ SDV.BIO ] Life Sciences [q-bio]/Biotechnology, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, nanomedicine, Transmembrane protein, [SDV.BIO] Life Sciences [q-bio]/Biotechnology, Receptors, TNF-Related Apoptosis-Inducing Ligand, Cell culture, Apoptosis, Cancer cell, Cancer research, cancer therapy, death receptor, Tumor necrosis factor alpha, Nanocarriers, 0210 nano-technology
Abstract

International audience; Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL or Apo2L) is a member of the tumor necrosis factor (TNF) superfamily. This type II transmembrane protein is able to bound specifically to cancer cell receptors (i.e., TRAIL-R1 (or DR4) and TRAIL-R2 (or DR5)) and to induce apoptosis without being toxic for healthy cells. Because membrane-bound TRAIL induces stronger receptor aggregation and apoptosis than soluble TRAIL, we proposed here to vectorize TRAIL using single-walled carbon nanotubes (SWCNTs) to mimic membrane TRAIL. Owing to their exceptional and revolutional properties, carbon nanotubes, especially SWCNTs, are used in a wide range of physical or, now, medical applications. Indeed due to their high mechanical resistance, their high flexibility and their hydrophobicity, SWCNTs are known to rapidly diffuse in an aqueous medium such as blood, opening the way of development of new drug nanovectors (or nanocarriers). Our TRAIL-based SWCNTs nanovectors proved to be more efficient than TRAIL alone death receptors in triggering cancer cell killing. These NPTs increased TRAIL pro-apoptotic potential by nearly 20-fold in different Human tumor cell lines including colorectal, nonsmall cell lung cancer, or hepatocarcinomas. We provide thus a proof-of-concept that TRAIL nanovector derivatives based on SWCNT may be useful to future nanomedicine therapies.

Published
2015

26. Resonant Raman scattering by breathing modes of metal nanoparticles

Author

Fabrice Vallée, Shinji Hayashi, Minoru Fujii, Lucien Saviot, N. Del Fatti, Hervé Portalès, Eugène Duval, Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Sustainability Governance Project, Creative Research Initiative, Centre de physique moléculaire optique et hertzienne (CPMOH), Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1, Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Centre de physique moléculaire optique et hertzienne ( CPMOH ), Centre National de la Recherche Scientifique ( CNRS ) -Université Sciences et Technologies - Bordeaux 1, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon

Subjects
[PHYS]Physics [physics], [ PHYS ] Physics [physics], Materials science, Analytical chemistry, General Physics and Astronomy, Nanoprobe, Nanoparticle, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Molecular physics, Spectral line, symbols.namesake, X-ray Raman scattering, Molecular vibration, 0103 physical sciences, symbols, Coherent anti-Stokes Raman spectroscopy, Physical and Theoretical Chemistry, 010306 general physics, 0210 nano-technology, Raman spectroscopy, ComputingMilieux_MISCELLANEOUS, Raman scattering
Abstract

International audience; Low-frequency Raman scattering experiments have been performed on metal nanoparticles embedded in two different thermally treated matrices. In addition to the well-known Raman scattering by the nanoparticle quadrupolar vibrational mode, the spectra measured in the $3–40 cm^{−1}$ frequency range exhibit several new bands. They are ascribed to resonant scattering by the nanoparticle breathing mode and its harmonics, in very good agreement with time-resolved measurements.

Published
2001

27. THz nanocrystal acoustic vibrations from ZrO2 3D supercrystals

Author

Nicola Pinna, Gianvito Caputo, Lucien Saviot, Daniel B. Murray, M.C. Marco de Lucas, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Humboldt Universität zu Berlin, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), and Humboldt-Universität zu Berlin

Subjects
Materials science, Annealing (metallurgy), Phonon, Terahertz radiation, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanotechnology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, symbols.namesake, Materials Chemistry, Cubic zirconia, business.industry, General Chemistry, 021001 nanoscience & nanotechnology, 3. Good health, 0104 chemical sciences, Nanocrystal, Transmission electron microscopy, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business, Raman spectroscopy, Powder diffraction
Abstract

International audience; We report sharp low-frequency Raman spectral features of supercrystals synthesized via the "benzyl alcohol route" and consisting of either yttrium-stabilized or pure zirconia (ZrO2) nanocrystals. In situ formed benzoate species control the nanocrystal growth and act as organic glue leading to the assembly of the nanocrystals in highly ordered 3D supercrystals. We attribute some Raman peaks to THz acoustic vibrations of individual nanocrystals which are only weakly coupled due to the strong acoustic mismatch between the capping ligands and the nanocrystals. Peak positions are consistent with nanocrystal sizes estimated from transmission electron microscopy and X-ray powder diffraction studies. Narrow size distribution, together with uniform morphological and structural features of the nanocrystals, leads to sharp Raman peaks in the THz spectral region. After removing the ligands by annealing, the acoustic vibrations of the nanocrystals couple resulting in an increase of their frequency. These findings suggest that 3D supercrystals of zirconia nanocrystals can be used for manipulating THz phonons.

Published
2013

28. Nanostructure and low-frequency vibrations in plasticized poly(methyl methacrylate)

Author

S. Etienne, L. David, Vladimir A. Bershtein, Marcin Kozanecki, Lucien Saviot, Eugène Duval, V. A. Ryzhov, Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire de Recherche sur la Réactivité des Solides (LRRS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Nanostructure, Astrophysics::High Energy Astrophysical Phenomena, Physics::Medical Physics, Analytical chemistry, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, symbols.namesake, chemistry.chemical_compound, 0103 physical sciences, Methyl methacrylate, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Scattering, Small-angle X-ray scattering, Plasticizer, 021001 nanoscience & nanotechnology, Poly(methyl methacrylate), Condensed Matter::Soft Condensed Matter, chemistry, visual_art, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, visual_art.visual_art_medium, 0210 nano-technology, Raman scattering, Intensity (heat transfer)
Abstract

The small-angle X-ray scattering (SAXS) and the low-frequency Raman scattering (LFRS) of pure and plasticized poly(methyl methacrylate) (PMMA) samples are compared. A correlation peak in SAXS appears in plasticized PMMA at about 0.15 A−1, which does not exist in pure PMMA. An increase of the boson peak intensity with the amount of plasticizer is observed. These observations allow to sustain the relation between the boson peak and inhomogeneous nanostructure in glasses.

Published
1998

29. Poisson ratio and excess low-frequency vibrational states in glasses

Author

Thierry Deschamps, Lucien Saviot, Eugène Duval, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut Lumière Matière [Villeurbanne] ( ILM ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), and Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Materials science, Hydrostatic pressure, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Physics and Astronomy, FOS: Physical sciences, 02 engineering and technology, Low frequency, 01 natural sciences, Condensed Matter::Disordered Systems and Neural Networks, symbols.namesake, Fragility, Normal mode, 0103 physical sciences, PACS numbers: 63.50.Lm, 62.20.dj, 62.65.+k, 81.05.Kf, Physical and Theoretical Chemistry, 010306 general physics, Debye, Condensed Matter - Materials Science, Condensed matter physics, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Poisson's ratio, Condensed Matter::Soft Condensed Matter, Sphere packing, Volume (thermodynamics), symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract

In glass, starting from a dependence of the Angell's fragility on the Poisson ratio [V. N. Novikov and A. P. Sokolov, Nature 431, 961 (2004)], and a dependence of the Poisson ratio on the atomic packing density [G. N. Greaves, A. L. Greer, R. S. Lakes, and T. Rouxel, Nature Mater. 10, 823 (2011)], we propose that the heterogeneities are predominantly density fluctuations in strong glasses (lower Poisson ratio) and shear elasticity fluctuations in fragile glasses (higher Poisson ratio). Because the excess of low-frequency vibration modes in comparison with the Debye regime (boson peak) is strongly connected to these fluctuations, we propose that they are breathing-like (with change of volume) in strong glasses and shear-like (without change of volume) in fragile glasses. As a verification, it is confirmed that the excess modes in the strong silica glass are predominantly breathing-like. Moreover, it is shown that the excess breathing-like modes in a strong polymeric glass are replaced by shear-like modes under hydrostatic pressure as the glass becomes more compact.

Published
2013

30. One-step microstructuring of TiO2 and Ag-TiO2 films by continuous wave laser processing in the UV and visible ranges

Author

Aziz Boukenter, E. Gamet, Lucien Saviot, Thierry Epicier, Nathalie Destouches, N. Crespo-Monteiro, Stéphanie Reynaud, Laurence Bois, Laboratoire Hubert Curien [Saint Etienne] ( LHC ), Université Jean Monnet [Saint-Étienne] ( UJM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Matériaux, ingénierie et science [Villeurbanne] ( MATEIS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Laboratoire des Multimatériaux et Interfaces ( LMI ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Multimatériaux et Interfaces (LMI), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel ( LKB (Jussieu) ), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris ( FRDPENS ), Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Paris ( ENS Paris ) -Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Paris ( ENS Paris ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Anatase, RAMAN-SCATTERING, Materials science, MULTICOLOR PHOTOCHROMISM, Nanoparticle, GLASS, 02 engineering and technology, SILVER NANOPARTICLES, 010402 general chemistry, 01 natural sciences, Silver nanoparticle, law.invention, [SPI]Engineering Sciences [physics], symbols.namesake, THIN-FILMS, Optics, law, Physical and Theoretical Chemistry, Crystallization, ComputingMilieux_MISCELLANEOUS, TITANIUM-DIOXIDE, [ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, INDUCED CRYSTALLIZATION, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Amorphous solid, General Energy, Carbon film, symbols, Optoelectronics, 0210 nano-technology, business, Raman spectroscopy, Visible spectrum
Abstract

International audience; The transformation of three kinds of mesoporous films of amorphous TiO2 under exposure to continuous wave (CW) lasers emitting at UV and visible wavelengths is investigated. Silver-free films, films impregnated with a silver salt, and films loaded with silver nanoparticles are considered. The silver containing films had previously been shown to exhibit a photochromic behavior. Intensity thresholds leading to laser-induced crystallization are evaluated using a combination of Raman spectroscopy, atomic force microscopy, and high-resolution electron microscopy. Crystallization in the anatase and rutile phases as well as ablation of the films are shown at 244 nm wavelength for increasing intensity, whatever the nature of the films. However, under visible light exposure, crystallization only occurs in the silver containing films. The oxidized-silver containing films, that are shown to be as transparent as the silver-free films in the visible range, appear to crystallize under visible light. The temperature rise occurring during visible light exposure and due to the plasmon-induced nanoparticle heating is measured. Finally, such a CW laser-induced crystallization is proven to be an accurate technique to produce permanent patterns with submicrometer widths and nanometer depths that can be tuned to within only a few nanometers. The patterns resist to temperature rises of 1000 degrees C.

Published
2012

31. Quasi-free nanoparticle vibrations in a highly-compressed ZrO2 nanopowder

Author

Daniel B. Murray, Denis Machon, Sergey V. Adichtchev, Frédéric Demoisson, M.C. Marco de Lucas, Jérémie Margueritat, Alain Mermet, Lucien Saviot, Mostapha Ariane, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit, University of British Columbia Okanagan (MATHEMATICS, STATISTICS AND PHYSICS UNIT, UNIVERSITY OF BRITISH COLUMBIA OKANAGAN), University of British Columbia (UBC), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique de la Matière Condensée et Nanostructures ( LPMCN ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Mathematics, Statistics and Physics Unit, University of British Columbia Okanagan ( MATHEMATICS, STATISTICS AND PHYSICS UNIT, UNIVERSITY OF BRITISH COLUMBIA OKANAGAN ), and University of British Columbia ( UBC )

Subjects
Imagination, Materials science, Chemical substance, Terahertz radiation, media_common.quotation_subject, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanoparticle, Nanotechnology, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Vibration, General Energy, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physical and Theoretical Chemistry, 010306 general physics, 0210 nano-technology, Science, technology and society, ComputingMilieux_MISCELLANEOUS, media_common
Abstract

Several-nanometer-size mechanical oscillators, or nanoresonators, may complement electronic and optical technologies in future terahertz devices, but they can be useful only if they can be made to ...

Published
2012

32. Number of observable features in the acoustic-Raman spectra of nanocrystals

Author

Nicolas Combe, Lucien Saviot, Adnen Mlayah, Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre d'élaboration de matériaux et d'études structurales ( CEMES ), Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), and Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Materials science, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Molecular physics, Spectral line, symbols.namesake, Condensed Matter::Materials Science, Optics, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Limit (mathematics), 010306 general physics, Range (particle radiation), Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Observable, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Nanocrystal, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], symbols, 0210 nano-technology, business, Raman spectroscopy
Abstract

Low-frequency Raman scattering spectra are presented for gold nanocrystals with diameters 3.5 and 13 nm. The frequencies of the Raman peaks but also their number are shown to vary with the nanocrystal size. These results are analyzed using both the continuous elastic medium approximation and an atomistic approach. We show that the number of atoms in the nanocrystal determines an upper limit of the number of observable Raman features. The frequency range in which the continuous elastic medium approximation is valid is defined by comparison with the calculations based on the atomistic approach., 5 pages, 7 figures

Published
2012

33. Growth of glass-embedded Cu nanoparticles: A low-frequency Raman scattering study

Author

Alain Mermet, E. Bernstein, Sergey Sirotkin, Emmanuel Cottancin, Lucien Saviot, Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Spectrométrie Ionique et Moléculaire ( LASIM ), École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire de Spectrométrie Ionique et Moléculaire (LASIM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), and Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Analytical chemistry, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, METAL NANOPARTICLES, 01 natural sciences, Annealing (glass), symbols.namesake, Crystallinity, Condensed Matter::Materials Science, CUPROUS-OXIDE, 0103 physical sciences, SILICA, 010306 general physics, Doping, COPPER NANOPARTICLES, OPTICAL-PROPERTIES, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Copper, Electronic, Optical and Magnetic Materials, NANOCRYSTALS, chemistry, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], symbols, 0210 nano-technology, Glass transition, Raman spectroscopy, MATRIX, Raman scattering
Abstract

International audience; Several populations of Cu spherical nanoparticles grown in a silicate glass at different temperatures with respect to the glass transition temperature were studied using high-resolution, low-frequency Raman scattering and optical absorption. The analysis of the spectra shows that the annealing of the doped glass at temperatures close to T-g leads to the formation of metallic copper nanoparticles with high crystallinity, whereas lower-temperature and higher-temperature annealings result in the formation of poorer nanoparticle assemblies in terms of size distribution and/or nanocrystallinity. It is also shown that in the case where the optical data do not unambiguously reveal the presence of metallic Cu nanoparticles, the Raman probe enables us to probe their presence as a result of the resonance process.

Published
2012

34. One step continuous hydrothermal synthesis of very fine stabilized superparamagnetic nanoparticles of magnetite

Author

Nadine Millot, Lionel Maurizi, Frédéric Bouyer, Lucien Saviot, Frédéric Demoisson, Jérémy Paris, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), and Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB )

Subjects
Materials science, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanoparticle, One-Step, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Catalysis, Hydrothermal circulation, Ion, Metal, Magnetics, chemistry.chemical_compound, Microscopy, Electron, Transmission, Materials Chemistry, Hydrothermal synthesis, Magnetite, Metals and Alloys, General Chemistry, 021001 nanoscience & nanotechnology, Ferrosoferric Oxide, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Chemical engineering, visual_art, Ceramics and Composites, visual_art.visual_art_medium, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanoparticles, Crystallite, 0210 nano-technology
Abstract

International audience; Stable suspensions of citrated SPIO nanoparticles were synthesised in one step using a hydrothermal continuous process. Citrates control the crystallite size and the oxidation degree of metallic ions despite the very short reaction time (4 s). Magnetite particles, Fe2.94O4, with an average size of 4 nm and good monodispersity were obtained.

Published
2011

35. Acoustic vibrations of monoclinic zirconia nanocrystals

Author

Mostapha Ariane, Frédéric Demoisson, Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), and Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Materials science, Condensed matter physics, Isotropy, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 02 engineering and technology, Crystal structure, 021001 nanoscience & nanotechnology, 01 natural sciences, Spectral line, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Crystallography, symbols.namesake, General Energy, 0103 physical sciences, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Cubic zirconia, Physical and Theoretical Chemistry, Elasticity (economics), 0210 nano-technology, Anisotropy, Raman spectroscopy, Monoclinic crystal system
Abstract

International audience; Polarized low-frequency Raman spectra originating from confined acoustic vibrations are reported for monoclinic ZrO2 nanoparticles with a narrow size distribution synthesized from a continuous supercritical water process. The monoclinic lattice structure is taken into account for the interpretation of the spectra by comparing with isotropic and anisotropic continuum elasticity calculations for monodomain nanocrystals. The various mechanisms leading to the broadening of the Raman peaks are discussed. We demonstrate that an accurate determination of the size distribution of the nanoparticles is possible using the Raman peak due to the fundamental breathing vibration which is hardly broadened by the elastic anisotropy and the shape distribution.

Published
2011

36. Experimental investigation of the grain size dependence of the hydrolysis of LiH powder

Author

Frédéric Bernard, J.L. Houzelot, C. Maupoix, Sophie Charton, E. Sciora, Lucien Saviot, G. Gaillard, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Génie Chimique (LSGC), Institut National Polytechnique de Lorraine (INPL)-Centre National de la Recherche Scientifique (CNRS), VALDUC (DAM/VALDUC), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire des Sciences du Génie Chimique ( LSGC ), Centre National de la Recherche Scientifique ( CNRS ), VALDUC ( DAM/VALDUC ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), and Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB)

Subjects
General Chemical Engineering, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Partial pressure, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Chemical reaction, 0104 chemical sciences, chemistry.chemical_compound, Hydrolysis, chemistry, Lithium hydride, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Hydroxide, Gravimetric analysis, Lithium, Particle size, 0210 nano-technology
Abstract

International audience; The hydrolysis reaction of LiH powder has been investigated in order to determine the products, rates and mechanisms of this reaction and the influence of the experimental parameters. Raman spectroscopy, X-ray diffraction and gravimetric analysis were used. It was shown that the product of hydrolysis was the hydroxide of lithium (LiOH) for low partial pressure of water (≈50 Pa) and LiOH*H2O for a higher partial pressure of water (>2000 Pa). Moreover, data obtained using gravimetric analysis inside a glove box containing a controlled partial pressure of water (500 ppmv/50 Pa at 25 °C) were used to determine the rate of the reaction versus particle size. The experimental results were consistent with the shrinking core model showing that initially, the conversion rate is controlled by the chemical reaction.

Published
2011

37. Acousto-Plasmonic and Surface-Enhanced Raman Scattering Properties of Coupled Gold Nanospheres/Nanodisk Trimers

Author

Sukant K. Tripathy, Siew Lang Teo, Lucien Saviot, Ming-Yong Han, Enyi Ye, Adnen Mlayah, Renaud Marty, Christian Girard, Arnaud Arbouet, Vivian Kaixin Lin, Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales ( CEMES ), Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB)

Subjects
Light, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Optics, Bioengineering, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Molecular physics, symbols.namesake, Optics, Materials Testing, Physics::Atomic and Molecular Clusters, Scattering, Radiation, General Materials Science, Computer Simulation, Surface plasmon resonance, Particle Size, Plasmon, Chemistry, business.industry, Mechanical Engineering, Surface plasmon, Resonance, General Chemistry, Acoustics, Surface Plasmon Resonance, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Nanostructures, Models, Chemical, Molecular vibration, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Gold, 0210 nano-technology, business, Raman spectroscopy, Raman scattering, Localized surface plasmon
Abstract

International audience; This work is devoted to the fundamental understanding of the interaction between acoustic vibrations and surface plasmons in metallic nano-objects. The acoustoplasmonic properties of coupled spherical gold nanoparticles and nanodisk trimers are investigated experimentally by optical transmission measurements and resonant Raman scattering experiments. For excitation close to resonance with the localized surface plasmons of the nanodisk trimers, we are able to detect several intense Raman bands generated by the spherical gold nanoparticles. On the basis of both vibrational dynamics calculations and Raman selection rules, the measured Raman bands are assigned to fundamental and overtones of the quadrupolar and breathing vibration modes of the spherical gold nanoparticles. Simulations of the electric near-field intensity maps performed at the Raman probe wavelengths showed strong localization of the optical energy in the vicinity of the nanodisk trimers, thus corroborating the role of the interaction between the acoustic vibrations of the spherical nanoparticles and the surface plasmons of the nanodisk trimers. Acoustic phonons surface enhanced Raman scattering is here demonstrated for the first time for such coupled plasmonic systems. This work paves the way to surface plasmon engineering for sensing the vibrational properties of nanoparticles.

Published
2011

38. Vibrations of weakly coupled nanoparticles

Author

Lucien Saviot, Daniel B. Murray, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit (MSP), and University of British Columbia (UBC)

Subjects
Dimer, FOS: Physical sciences, Nanoparticle, 02 engineering and technology, 01 natural sciences, Molecular physics, Light scattering, chemistry.chemical_compound, Quantum mechanics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Elasticity (economics), 010306 general physics, Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Numerical analysis, Isotropy, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Condensed Matter - Other Condensed Matter, Vibration, chemistry, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], SPHERES, 0210 nano-technology, Other Condensed Matter (cond-mat.other)
Abstract

The vibrations of a coupled pair of isotropic silver spheres are investigated and compared with the vibrations of the single isolated spheres. Situations of both strong coupling and also weak coupling are investigated using continuum elasticity and perturbation theory. The numerical calculation of the eigenmodes of such dimers is augmented with a symmetry analysis. This checks the convergence and applicability of the numerical method and shows how the eigenmodes of the dimer are constructed from those of the isolated spheres. The frequencies of the lowest frequency vibrations of such dimers are shown to be very sensitive to the strength of the coupling between the spheres. Some of these modes can be detected by inelastic light scattering and time-resolved optical measurements which provides a convenient way to study the nature of the mechanical coupling in dimers of micro and nanoparticles., expanded version, 8 pages, 5 figures, 2 tables

Published
2010

39. Simple model for the vibrations of embedded elastically cubic nanocrystals

Author

Lucien Saviot, Alain Mermet, M.C. Marco de Lucas, Eugène Duval, Sergey Sirotkin, Daniel B. Murray, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit (MSP), University of British Columbia (UBC), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), ANR-09-NANO-0023,FeNoPtic,Fibres optiques silice dopées par des Nanostructures métalliques exploitant la résonance de modes Plasmons localisés pour exalter les amplifications (Raman et Terres rares) et les effets non linéaires(2009), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), ANR : fenoptic,fenoptic, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon

Subjects
Work (thermodynamics), Materials science, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Spectral line, Matrix (mathematics), symbols.namesake, Optics, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 010306 general physics, Anisotropy, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Isotropy, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Vibration, Molecular vibration, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], symbols, 0210 nano-technology, business, Raman scattering
Abstract

The purpose of this work is to calculate the vibrational modes of an elastically anisotropic sphere embedded in an isotropic matrix. This has important application to understanding the spectra of low-frequency Raman scattering from nanoparticles embedded in a glass matrix. First some low frequency vibrational modes of a free cubically elastic sphere are found to be nearly independent of one combination of elastic constants. This is then exploited to obtain an isotropic approximation for these modes which enables to take into account the surrounding isotropic matrix. This method is then used to quantatively explain recent spectra of gold and copper nanocrystals in glasses., Comment: 6 pages, 5 figures

Published
2010
Full Text
View/download PDF

40. Effect of Reaction Parameters on Composition and Morphology of Titanate Nanomaterials

Author

Olivier Heintz, Nadine Millot, Rémi Chassagnon, Lucien Saviot, Anne-Laure Papa, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), and Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nanotube, Materials science, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Titanate, Grain size, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Nanomaterials, symbols.namesake, General Energy, X-ray photoelectron spectroscopy, Chemical engineering, Transmission electron microscopy, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physical and Theoretical Chemistry, 0210 nano-technology, Raman spectroscopy, Chemical composition
Abstract

International audience; In the present article, we report the synthesis of titanate nanotubes and nanoribbons with controlled morphology, structure, and chemical composition depending on the main parameters of the synthesis. Hydrothermal processing time, grain size of the precursor, type of agitation, and acid treatment were investigated, and the principal controversies mentioned in the literature such as nanotube crystallographic structure, their chemical composition, and acid treatment impact are discussed. These controversies may be due to the heterogeneities present in all the samples and are rarely considered in the literature. These nanostructures were characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy. A careful desummation of the first XRD peaks revealed the presence of both nanosheets and nanotubes and allowed an estimation of their proportions. In addition, the titanate nanotube section is observed to be not perfectly circular but rather elliptic. Moreover, the first acid treatment effect is shown to remove any trace of sodium and structural water. The second effect of acid washing is a morphological evolution.

Published
2009

41. Acoustic modes in metallic nanoparticles: atomistic versus elasticity modeling

Author

Lucien Saviot, Nicolas Combe, Centre d'élaboration de matériaux et d'études structurales ( CEMES ), Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB)

Subjects
Materials science, Nanostructure, PACS: 63.22.-m, 63.22.Kn, 81.05Bx, FOS: Physical sciences, Nanotechnology, 02 engineering and technology, 01 natural sciences, Normal mode, 0103 physical sciences, Atom, Physics::Atomic and Molecular Clusters, Elasticity (economics), 010306 general physics, Anisotropy, Scaling, Stiffness matrix, [PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], Condensed Matter - Materials Science, Condensed matter physics, Linear elasticity, [SPI.MECA.VIBR]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Condensed Matter Physics, [ SPI.MECA.VIBR ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], Electronic, Optical and Magnetic Materials, [ PHYS.MECA.VIBR ] Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], 0210 nano-technology
Abstract

The validity of the linear elasticity theory is examined at the nanometer scale by investigating the vibrational properties of silver and gold nanoparticles whose diameters range from about 1.5 to 4 nm. Comparing the vibration modes calculated by elasticity theory and atomistic simulation based on the Embedded Atom Method, we first show that the anisotropy of the stiffness tensor in elastic calculation is essential to ensure a good agreement between elastic and atomistic models. Second, we illustrate the reduction of the number of vibration modes due to the diminution of the number of atoms when reducing the nanoparticles size. Finally, we exhibit a breakdown of the frequency-spectra scaling of the vibration modes and attribute it to surface effects. Some critical sizes under which such effects are expected, depending on the material and the considered vibration modes are given., Accepted to Phys. Rev. B

Published
2009

42. High-order vibration modes of bimetallic Ag-Au nanoparticles embedded in glass

Author

B. Stephanidis, Guillaume Bachelier, Sergey V. Adichtchev, Sergey Sirotkin, Lucien Saviot, A. Mermet, Samuel Etienne, and Eugène Duval

Subjects
Materials science, business.industry, Scattering, 02 engineering and technology, Low frequency, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Molecular physics, Electronic, Optical and Magnetic Materials, symbols.namesake, Optics, X-ray Raman scattering, Normal mode, Harmonics, 0103 physical sciences, symbols, Physics::Atomic Physics, Coherent anti-Stokes Raman spectroscopy, 010306 general physics, 0210 nano-technology, business, Raman spectroscopy, Raman scattering
Abstract

High resolution low frequency Raman scattering measurements from embedded AgAu nanoparticles unveil efficient scattering by harmonics of both the quadrupolar and the spherical modes. Comparing the experimental data with theoretical calculations that account for both the embedding medium and the resonant Raman process enables a very complete description of the observed multiple components in terms of harmonics of both the quadrupolar and spherical modes, with a dominating Raman response from the former ones. It is found that only selected harmonics of the quadrupolar mode contribute significantly to the Raman spectra in agreement with earlier theoretical predictions.

Published
2009

43. Acousto-plasmonic hot spots in metallic nano-objects

Author

Carmen N. Afonso, Arnaud Arbouet, P. Langot, Adnen Mlayah, José Gonzalo, Jérémie Margueritat, Javier Aizpurua, Lucien Saviot, Nicolas Large, Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laser Processing Group, Instituto de Optica, Centre de physique moléculaire optique et hertzienne (CPMOH), Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université Sciences et Technologies - Bordeaux 1 (UB)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales ( CEMES ), Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de physique moléculaire optique et hertzienne ( CPMOH ), and Centre National de la Recherche Scientifique ( CNRS ) -Université Sciences et Technologies - Bordeaux 1

Subjects
[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Optics, Bioengineering, 02 engineering and technology, 01 natural sciences, symbols.namesake, Optics, Normal mode, 0103 physical sciences, Physics::Atomic and Molecular Clusters, General Materials Science, 010306 general physics, Plasmon, Chemistry, business.industry, Mechanical Engineering, Surface plasmon, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Molecular vibration, Femtosecond, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, business, Raman spectroscopy, Raman scattering, Localized surface plasmon
Abstract

We investigate the acousto-plasmonic dynamics of metallic nano-objects by means of resonant Raman scattering and time-resolved femtosecond transient absorption. We observe an unexpectedly strong acoustic vibration band in the Raman scattering of sliver nanocolumns, usually not found in isolated nano-objects. The frequency and the polarization of this unexpected Raman band allow us to assign it to breathing-like acoustic vibration modes. On the basis of full electromagnetic near-field calculations coupled to the elasticity theory, we introduce a new concept of >acousto-plasmonic hot spots> which arise here because of the indented shape of the nanocolumns. These hot spots combine both highly localized surface plasmons and strong shape deformation by the acoustic vibrations at specific sites of the nano-objects. We show that the coupling between breathing-like acoustic vibrations and surface plasmons at the >acousto-plasmonic hot spots> is strongly enhanced, turning almost silent vibration modes into efficient Raman scatterers. © 2009 American Chemical Society., This work was partially supported by C’Nano GSO program (France), by MAT2009-14282-C02- 01, MCINN (Spain), by Spanish CSIC intramural project 200860I039, and by an “Integrated Action” between France and Spain (HF2008-0038).

Published
2009

44. Acoustic vibrations of anisotropic nanoparticles

Author

Daniel B. Murray, Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit (MSP), and University of British Columbia (UBC)

Subjects
Materials science, Condensed Matter - Mesoscale and Nanoscale Physics, Isotropy, FOS: Physical sciences, Nanoparticle, Anisotropic nanoparticles, 02 engineering and technology, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Vibration, Tetragonal crystal system, Classical mechanics, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Irreducible representation, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Homogeneous space, Elasticity (economics), 010306 general physics, 0210 nano-technology
Abstract

Acoustic vibrations of nanoparticles made of materials with anisotropic elasticity and nanoparticles with non-spherical shapes are theoretically investigated using a homogeneous continuum model. Cubic, hexagonal and tetragonal symmetries of the elasticity are discussed, as are spheroidal, cuboctahedral and truncated cuboctahedral shapes. Tools are described to classify the different vibrations and for example help identify the modes having a significant low-frequency Raman scattering cross-section. Continuous evolutions of the modes starting from those of an isotropic sphere coupled with the determination of the irreducible representation of the branches permit some qualitative statements to be made about the nature of various modes. For spherical nanoparticles, a more accurate picture is obtained through projections onto the vibrations of an isotropic sphere., Comment: 11 pages, 9 tables, 6 figures

Published
2009

45. Surface enhanced Raman scattering of silver sensitized cobalt nanoparticles in metal–dielectric nanocomposites

Author

José Gonzalo, Y Zhou, Boris Luk'yanchuk, Lucien Saviot, G. Van Tendeloo, Jérémie Margueritat, Carmen N. Afonso, Daniel B. Murray, U. Hörmann, Minghui Hong, Adnen Mlayah, Laser Processing Group, Instituto de Optica, Centre d'élaboration de matériaux et d'études structurales ( CEMES ), Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Mathematics, Statistics and Physics Unit (MSP), University of British Columbia (UBC), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB)

Subjects
inorganic chemicals, Materials science, Analytical chemistry, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], chemistry.chemical_element, Nanoparticle, Nanoprobe, Bioengineering, 02 engineering and technology, 01 natural sciences, Silver nanoparticle, symbols.namesake, 0103 physical sciences, General Materials Science, Electrical and Electronic Engineering, 010306 general physics, Nanocomposite, Mechanical Engineering, Physics, Surface plasmon, General Chemistry, 021001 nanoscience & nanotechnology, chemistry, Chemical engineering, Mechanics of Materials, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Raman spectroscopy, Cobalt, Raman scattering
Abstract

We report the preparation of a new type of nanocomposite containing cobalt and silver nanoparticles organized in parallel layers with a well controlled separation. This arrangement allows the observation of an enhanced low-frequency Raman signal at the vibration frequency of cobalt nanoparticles excited through the surface plasmons of silver nanoparticles. Numerical simulations of the electric field confirm the emergence of hot spots when the separation between silver and cobalt nanoparticles is small enough. © IOP Publishing Ltd., This work was partially supported by MAT2005-06508-C02- 01, MEC (Spain), and by EU Network HPRN-CT-2002- 00328. JM acknowledges an I3P fellowship from CSIC and the European Social Fund and financial support from the CSIC for a stay in DSI (Singapore).

Published
2008

46. Inelastic neutron scattering due to acoustic vibrations confined in nanoparticles: theory and experiment

Author

D. Aymes, Anne-Laure Papa, Daniel B. Murray, Nadine Millot, Lucien Saviot, Catherine Pighini, Stéphane Rols, Caleb H. Netting, Alain Mermet, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Institut Laue-Langevin ( ILL ), ILL, Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit (MSP), University of British Columbia (UBC), Institut Laue-Langevin (ILL), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
Condensed Matter - Materials Science, Quasielastic scattering, Materials science, Phonon scattering, Scattering, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Physics::Optics, 02 engineering and technology, Neutron scattering, Inelastic scattering, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Inelastic neutron scattering, 3. Good health, Electronic, Optical and Magnetic Materials, X-ray Raman scattering, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Scattering theory, Atomic physics, 010306 general physics, 0210 nano-technology
Abstract

The inelastic scattering of neutrons by nanoparticles due to acoustic vibrational modes (energy below 10 meV) confined in nanoparticles is calculated using the Zemach-Glauber formalism. Such vibrational modes are commonly observed by light scattering techniques (Brillouin or low-frequency Raman scattering). We also report high resolution inelastic neutron scattering measurements for anatase TiO2 nanoparticles in a loose powder. Factors enabling the observation of such vibrations are discussed. These include a narrow nanoparticle size distribution which minimizes inhomogeneous broadening of the spectrum and the presence of hydrogen atoms oscillating with the nanoparticle surfaces which enhances the number of scattered neutrons., Comment: 3 figures, 1 table

Published
2008

47. Millimeter wave absorption by confined acoustic modes in CdSe/CdTe core-shell quantum dots

Author

Tzu-Ming Liu, Meng Ju Yang, Chung Chiu Kuo, Yu-Chieh Wen, Pi-Tai Chou, Ja-Yu Lu, Chi-Kuang Sun, Daniel B. Murray, Chih-Wei Lai, Lucien Saviot, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ), Mathematics, Statistics and Physics Unit, University of British Columbia ( UBC ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), and University of British Columbia (UBC)

Subjects
History, Photon, Materials science, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Optics, 02 engineering and technology, 01 natural sciences, Education, Core shell, Condensed Matter::Materials Science, 0103 physical sciences, 010306 general physics, Absorption (electromagnetic radiation), business.industry, Condensed Matter::Other, 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Cadmium telluride photovoltaics, Computer Science Applications, Dipole, Quantum dot, Absorption band, Extremely high frequency, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business
Abstract

International audience; Taking advantage of the specific core-shell charge separation structure in the CdSe/CdTe core-shell Type-II quantum dots (QDs), we experimentally observed the resonant-enhanced dipolar interaction between millimeter-wave (MMW) photons and their corresponding (l = 1) confined acoustic phonons. With proper choice of size, the absorption band can be tuned to desired frequency of MMW imaging. Exploiting this characteristic absorption, in a fiber-scanned MMW imaging system, we demonstrated the feasibility of CdSe/CdTe QDs as the contrast agents of MMW imaging.

Published
2007

48. Polarizability calculation of vibrating nanoparticles for intensity of low wavenumber Raman scattering

Author

Lucien Saviot, Caleb H. Netting, Daniel B. Murray, Robin D. Mercer, Mathematics, Statistics and Physics Unit, University of British Columbia Okanagan (MATHEMATICS, STATISTICS AND PHYSICS UNIT, UNIVERSITY OF BRITISH COLUMBIA OKANAGAN), University of British Columbia (UBC), Laboratoire de Recherche sur la Réactivité des Solides (LRRS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit, University of British Columbia Okanagan ( MATHEMATICS, STATISTICS AND PHYSICS UNIT, UNIVERSITY OF BRITISH COLUMBIA OKANAGAN ), University of British Columbia ( UBC ), Laboratoire de Recherche sur la Réactivité des Solides ( LRRS ), and Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Permittivity, Materials science, Raman intensity, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], FOS: Physical sciences, Physics::Optics, 02 engineering and technology, Dielectric, 01 natural sciences, Molecular physics, symbols.namesake, Polarizability, Electric field, 0103 physical sciences, General Materials Science, 010306 general physics, Spectroscopy, Condensed Matter - Materials Science, Numerical analysis, nanoparticle, dipole moment, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, permittivity, polarizability, Dipole, Moment (physics), symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Raman scattering
Abstract

A new numerical method is introduced for calculating the polarizability of an arbitrary dielectric object with position dependent complex permittivity. Three separate numerical approaches are provided to calculate the dipole moment of a nanoparticle embedded in a dielectric matrix in the presence of an applied electric field. Numerical tests confirm the accuracy of this method when applied to several cases for which an exact solution is available. This method is especially well suited for the calculation of absolute Raman scattering intensities due to acoustic phonons in metallic and dielectric nanoparticles embedded in transparent matrices., Comment: Submitted to the Journal of Raman Spectroscopy

Published
2007

49. Comment on 'Infrared and Raman selection rules for elastic vibrations of spherical nanoparticles'

Author

Eugène Duval, Lucien Saviot, Serguei Goupalov, Laboratoire de Recherche sur la Réactivité des Solides (LRRS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire de Recherche sur la Réactivité des Solides ( LRRS ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, business.industry, Infrared, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanoparticle, Infrared spectroscopy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Molecular physics, Electronic, Optical and Magnetic Materials, symbols.namesake, X-ray Raman scattering, Optics, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, Coherent anti-Stokes Raman spectroscopy, 010306 general physics, 0210 nano-technology, Raman spectroscopy, business, Selection (genetic algorithm), Raman scattering
Abstract

This Comment demonstrates again that selection rules established several years ago for the infrared absorption and the Raman scattering by vibrations of a spherical nanoparticle are correct and that the claimed errors about them are wrong.

Published
2006

50. Surface plasmons and vibrations of self-assembled silver nanocolumns

Author

Daniel B. Murray, Carmen N. Afonso, Adnen Mlayah, José Gonzalo, Lucien Saviot, Jérémie Margueritat, Laboratoire de physique des solides ( LPS ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Recherche sur la Réactivité des Solides ( LRRS ), and Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Models, Molecular, Light, Surface Properties, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Optics, Bioengineering, 02 engineering and technology, Vibration, 01 natural sciences, Molecular physics, Self assembled, symbols.namesake, Optics, Materials Testing, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Computer Simulation, General Materials Science, Particle Size, Surface plasmon resonance, 010306 general physics, Coupling, Nanotubes, Chemistry, business.industry, Mechanical Engineering, Surface plasmon, General Chemistry, Surface Plasmon Resonance, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Transverse plane, Models, Chemical, Molecular vibration, symbols, Crystallization, 0210 nano-technology, business, Raman scattering
Abstract

6 pags. ; 5 figs. 1 tab., Optical and vibrational properties of novel self-assembled silver nanocolumns are studied experimentally and theoretically. The split of the surface plasmon resonance into transverse and longitudinal modes verifies the one-dimensional character of the nanocolumns. In this work, we have identified the acoustic vibration modes of the nanocolumns using Raman scattering, as spheroid-like modes (l = 2, m = ±2) involving vibrations of the nanocolumns along their minor axes and the existence of surface plasmon-vibration coupling mechanisms., Acknowledgment. This work was partially supported by MAT2005-06508-C02-01, MEC (Spain), and by EU Network HPRN-CT-2002-00328. J.M. acknowledges an I3P fellowship from the CSIC and the European Social Fund. D.B.M. acknowledges support from NSERC.

Published
2006

Catalog

Books, media, physical & digital resources
See catalog results