Author: "Xiang Zhen Xu" / Search Limiters: Full Text - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Xiang Zhen Xu"' showing total 26 results

Start Over Author "Xiang Zhen Xu" Search Limiters Full Text

26 results on '"Xiang Zhen Xu"'

1. Double-crowned 2D semiconductor nanoplatelets with bicolor power-tunable emission

Author: Corentin Dabard, Victor Guilloux, Charlie Gréboval, Hong Po, Lina Makke, Ningyuan Fu, Xiang Zhen Xu, Mathieu G. Silly, Gilles Patriarche, Emmanuel Lhuillier, Thierry Barisien, Juan I. Climente, Benjamin T. Diroll, and Sandrine Ithurria
Subjects: Science
Abstract: Nanocrystals are desirable light sources for advanced display technologies. Here, the authors report on double-crowned 2D semiconductor nanoplatelets as light downconverters that offer both green and red emissions to achieve a wide color gamut.
Published: 2022
Full Text: View/download PDF

2. Multi-intervention integrated deworming strategy for sustained control of soil-transmitted helminths infections: a case study in Jiangsu Province, China

Author: Fan-Zhen Mao, Yu-Ying Chen, Xiang-Zhen Xu, Bi-Xian Ni, Xiao-Lin Jin, Yang Dai, and Jun Cao
Subjects: Soil-transmitted helminths, Multi-intervention, Control, Strategy, China, Infectious and parasitic diseases, RC109-216, Public aspects of medicine, RA1-1270
Abstract: Abstract Background Soil-transmitted helminths (STH) infections still present a global health problem. Mass drug administration (MDA) is a widely applied strategy to reduce morbidity and mortality caused by STH. Yet, this approach has some shortcomings. In this study, we analyzed the impact of a multi-intervention integrated deworming approach including MDA, health education (HE), and environmental sanitation improvements (ESI) for sustained STH control in Jiangsu Province of China that was applied from 1989 to 2019. Methods Data, including infection rate of STH, medications used, coverage of the medication, non-hazardous lavatory rate, and household piped-water access rate in rural areas, and actions related to HE and ESI were collected (from archives) and analyzed in this retrospective descriptive study. Pearson’s correlation analysis was applied to test correlations. Results There was a dramatic decline in the infection rate of STH from 1989 (59.32%) to 2019 (0.12%). From 1995 to 1999, MDA and HE were recommended in rural areas. A negative correlation was observed between infection rate and medication from 1994 to 1998 (r = - 0.882, P = 0.048). From 2000 to 2005, targeted MDA was given to high-risk populations with HE continuously promoting good sanitation behaviors. From 2006 to 2014, targeted MDA + HE and ESI were used to consolidate the control effect. ESI was strengthened from 2006, and a negative correlation was observed between the coverage rate of the non-hazardous lavatory and the infection rate from 2006 to 2019 (r = - 0.95, P
Published: 2021
Full Text: View/download PDF

3. Geochemical constraints on the multistage evolution of the Yilashan ophiolite, central Tibet

Author: Xiang zhen Xu, Fahui Xiong, Basem Zoheir, Jinyu Yan, Boyang Zhang, Ran Zhang, and Jingsui Yang
Subjects: Geochemistry and Petrology, Economic Geology, Geology
Published: 2023

4. Electroluminescence from HgTe Nanocrystals and Its Use for Active Imaging

Author: Xavier Marie, Sandrine Ithurria, Audrey Chu, Prachi Rastogi, Corentin Dabard, Adrien Khalili, Mathieu G. Silly, Emmanuel Lhuillier, Delphine Lagarde, Junling Qu, Simon Ferré, Charlie Gréboval, Xiang Zhen Xu, Hervé Cruguel, Cedric Robert, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et chimie des nano-objets (LPCNO), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), 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), 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), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), European Project: 756225,blackQD, European Project: 853049,ne2dem, Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), 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)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Infrared Rays, Infrared, Terahertz radiation, Bioengineering, 02 engineering and technology, Electroluminescence, HgTe, 7. Clean energy, electroluminescence, active imaging, law.invention, chemistry.chemical_compound, law, General Materials Science, Lead sulfide, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Absorption (electromagnetic radiation), Lighting, short wave infrared, narrow band gap nanocrystals, business.industry, Mechanical Engineering, Mercury telluride, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Indium tin oxide, chemistry, Nanoparticles, Optoelectronics, Gold, Zinc Oxide, 0210 nano-technology, business, Light-emitting diode
Abstract: International audience; Mercury telluride (HgTe) nanocrystals are among of the most versatile infrared (IR) materials with the absorption of first optical absorption which can be tuned from visible to the THz range. Therefore, they have been extensively considered as near IR emitters and as absorbers for low-cost IR detectors. However, the electroluminescence of HgTe remains poorly investigated in spite of its ability to go toward longer wavelengths compared to traditional lead sulfide (PbS). Here, we demonstrate a light emitting diode (LED) based on an indium tin oxide (ITO)/zinc oxide (ZnO)/ZnO-HgTe/PbS/gold stacked structure, where the emitting layer consists of a ZnO/HgTe bulk heterojunction which drives the charge balance in the system. This LED has low turn-on voltage, long lifetime, and high brightness. Finally, we conduct short wavelength infrared (SWIR) active imaging, where illumination is obtained from a HgTe NC-based LED, and demonstrate moisture detection.
Published: 2020

5. Optimized Cation Exchange for Mercury Chalcogenide 2D Nanoplatelets and Its Application for Alloys

Author: Corentin Dabard, Mariarosa Cavallo, Adrien Khalili, Emmanuel Lhuillier, Sandrine Ithurria, Xiang Zhen Xu, Hong Po, Nicolas Moghaddam, Mathieu G. Silly, Eva Izquierdo, Erwan Bossavit, Stefano Pierini, Charlie Gréboval, Audrey Chu, Josep Planelles, Philippe Hollander, Lina Makke, Tung Huu Dang, Juan I. Climente, Claire Abadie, 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), Universitat Jaume I, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-21-CE24-0012,BRIGHT,Diode électroluminescente infrarouge brillante par exaltation du couplage lumière-matière(2021), ANR-21-CE09-0029,MixDFerro,Heterostructures à dimensions mixtes sous contrôle ferroélectrique 2D(2021), ANR-20-ASTR-0008,NITquantum,Design et fabrication d'un plan focal dans le proche infrarouge à base de nanocrisrtaux(2020), European Project: 853049,ne2dem, and European Project: 756225,blackQD
Subjects: colloidal quantum-wells, spectroscopy, Materials science, Chalcogenide, General Chemical Engineering, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, semiconductors, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Materials Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], PBS nanoplatelets, core, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, band-structure, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Mercury (element), chemistry, Nanocrystal, barrier, 0210 nano-technology, narrow, CDSE nanoplatelets
Abstract: II–VI two-dimensional (2D) nanoplatelets (NPLs) exhibit the narrowest optical features among nanocrystals (NCs). This property remains true for Hg-based NPLs, despite a cation exchange procedure to obtain them from Cd-based NPLs, which leads to structural defects (poorly defined edges and voids) inducing inhomogeneous broadening. Here, we propose an optimized procedure for which a solvent, surface chemistry, and reaction conditions are rationally considered. The procedure is applied to the growth of alloyed HgSe1–xTex NPLs with various compositions. We report a bright photoluminescence for all compositions. Structural properties being now well defined, it is possible to study the electronic properties of these objects. To do so, we combine k·p modeling of quantum-confined structures with X-ray photoemission. In particular, we clarify the origin of the similarity between CdTe and HgTe NPLs absorption spectra despite their vastly differing bulk band structures. Finally, static- and time-resolved photoemission unveil a crossover from n- to p-type behavior in HgSe1–xTex NPLs while increasing the Te content. The project was supported by ERC starting grants Ne2DeM (grant no 853049) and blackQD (grant no 756225). The authors acknowledge the use of clean-room facilities at the “Centrale de Proximité Paris-Centre”. This work was supported by Region Ile-de-France in the framework of DIM Nano-K (grant dopQD). This work was also supported by French state funds managed by the ANR within the Investissements d’Avenir programme under reference ANR-11-IDEX-0004-02 and, more specifically, within the framework of the Cluster of Excellence MATISSE and by grants IPER-Nano2 (ANR-18CE30-0023-01), Copin (ANR-19-CE24-0022), Frontal (ANR-19-CE09-0017), Graskop (ANR-19-CE09-0026), NITQuantum (ANR-20-ASTR-0008-01), Bright (ANR-21-CE24-0012-02), and MixDferro (ANR-21-CE09-0029). A.C. thanks Agence Innovation Defense for Ph.D. funding. J.P. and J.I.C. acknowledge support from Prometeo Grant Q-Devices (Prometeo/2018/098).
Published: 2021

6. Multi-intervention integrated deworming strategy for sustained control of soil-transmitted helminths infections: a case study in Jiangsu Province, China

Author: Jun Cao, Xiang-Zhen Xu, Dai Yang, Yu-Ying Chen, Mao Fanzhen, Ni Bixian, and Xiao-Lin Jin
Subjects: medicine.medical_specialty, China, Sanitation, Psychological intervention, Strategy, Helminthiasis, Infectious and parasitic diseases, RC109-216, Multi-intervention, Deworming, Soil, Environmental health, Helminths, Control, medicine, Global health, Prevalence, Animals, Humans, Mass drug administration, Retrospective Studies, Anthelmintics, Case Study, business.industry, Public health, Public Health, Environmental and Occupational Health, Soil-transmitted helminths, General Medicine, Infectious Diseases, Cross-Sectional Studies, Health education, Public aspects of medicine, RA1-1270, Rural area, business
Abstract: Background Soil-transmitted helminths (STH) infections still present a global health problem. Mass drug administration (MDA) is a widely applied strategy to reduce morbidity and mortality caused by STH. Yet, this approach has some shortcomings. In this study, we analyzed the impact of a multi-intervention integrated deworming approach including MDA, health education (HE), and environmental sanitation improvements (ESI) for sustained STH control in Jiangsu Province of China that was applied from 1989 to 2019. Methods Data, including infection rate of STH, medications used, coverage of the medication, non-hazardous lavatory rate, and household piped-water access rate in rural areas, and actions related to HE and ESI were collected (from archives) and analyzed in this retrospective descriptive study. Pearson’s correlation analysis was applied to test correlations. Results There was a dramatic decline in the infection rate of STH from 1989 (59.32%) to 2019 (0.12%). From 1995 to 1999, MDA and HE were recommended in rural areas. A negative correlation was observed between infection rate and medication from 1994 to 1998 (r = - 0.882, P = 0.048). From 2000 to 2005, targeted MDA was given to high-risk populations with HE continuously promoting good sanitation behaviors. From 2006 to 2014, targeted MDA + HE and ESI were used to consolidate the control effect. ESI was strengthened from 2006, and a negative correlation was observed between the coverage rate of the non-hazardous lavatory and the infection rate from 2006 to 2019 (r = - 0.95, P Conclusions Multi-intervention integrated deworming strategy contributes to the reduction of STH infections. This approach is a valuable example of how different interventions can be integrated to promote durable STH control. Graphic abstract
Published: 2021

7. Seeded growth of HgTe nanocrystals for shape control and their use in narrow infrared electroluminescence

Author: Audrey Chu, Christophe Delerue, Emmanuel Lhuillier, Xiang Zhen Xu, Junling Qu, Charlie Gréboval, Corentin Dabard, Sandrine Ithurria, Prachi Rastogi, Adrien Khalili, Yoann Prado, Nanostructures et optique (INSP-E4), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Physico-chimie et dynamique des surfaces (INSP-E6), 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), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-20-ASTR-0008,NITquantum,Design et fabrication d'un plan focal dans le proche infrarouge à base de nanocrisrtaux(2020), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), European Project: 756225,blackQD, European Project: 853049,ne2dem, Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)
Subjects: Materials science, Photoluminescence, Infrared, business.industry, General Chemical Engineering, Near-infrared spectroscopy, Quantum yield, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Electroluminescence, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, Nanocrystal, law, Lattice (order), Materials Chemistry, Optoelectronics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology, business, Light-emitting diode
Abstract: International audience; HgTe colloidal nanocrystals (NCs) have become a promising building block for infrared optoelectronics. Despite their cubic zinc blende lattice, HgTe NCs tend to grow in a multipodic fashion, leading to poor shape and size control. Strategies to obtain HgTe NCs with well-controlled sizes and shapes remain limited and sometimes challenging to handle, increasing the need for a new growth process. Here, we explore a synthetic route via seeded growth. In this approach, the small HgTe seeds are nucleated in the first step, and they show narrow and bright photoluminescence with 75% quantum yield in the near infrared region. Once integrated into Light emitting diodes (LEDs), these seeds lead to devices with high radiance up to 20 WSr-1 m-2 and a long lifetime. Heating HgTe seeds formed at the early stage leads to the formation of sphere-shaped HgTe with tunable band edges from 2 to 4 µm. Last, the electronic transport tests conducted on sphere-shaped HgTe NC arrays reveals enhanced mobility and stronger temperature dependence than the multipodic shaped particles.
Published: 2021

8. 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

9. A nanoplatelet-based light emitting diode and its use for all-nanocrystal LiFi-like communication

Author: Audrey Chu, Emmanuel Lhuillier, Marion Dufour, Charlie Gréboval, Junling Qu, Julien Ramade, Sandrine Ithurria, Prachi Rastogi, Sang-Soo Chee, Xiang Zhen Xu, Clément Livache, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-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), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), European Project: 756225,blackQD, and European Project: 853049,ne2dem
Subjects: Materials science, Photodetector, 02 engineering and technology, nanocrystal- based communication, 010402 general chemistry, 01 natural sciences, 7. Clean energy, law.invention, efficiency droop, law, electronic transport, Solar cell, General Materials Science, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Diode, Liquid-crystal display, business.industry, nanoplatelets, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, light emitting diode, Quantum dot, Optoelectronics, Quantum efficiency, 0210 nano-technology, business, Luminescence, Light-emitting diode
Abstract: International audience; Since colloidal nanocrystals (NCs) were integrated as green and red sources for LCD displays, the next challenge for quantum dots has been their use in electrically driven light emitting diodes (LEDs). Among various colloidal nanocrystals, nanoplatelets (NPLs) appeared as promising candidates for light emitting devices because their two-dimensional shape allows a narrow luminescence spectrum, directional emission and high light extraction. To reach high quantum efficiency it is critical to grow core/shell structures. High temperature growth of the shells seems to be a better strategy than previously reported low temperature approaches to obtain bright NPLs. Here, we synthesize CdSe/CdZnS core/shell NPLs whose shell alloy content is tuned to optimize the hole injection in the LED structure. The obtained LED has exceptionally low turn-on voltage, long-term stability (>3100 h at 100 Cd.m-2), external quantum efficiency above 5% and luminance up to 35000 cd.m-2. We study the low-temperature performance of the LED and find that there is a delay of droop in terms of current density as temperature decreases. In the last part of the paper, we design a large LED (56 mm2 emitting area) and test its potential for LiFi-like communication. In such approach, the LED is not only a lightning source but also used to transmit a communication signal to a PbS quantum dot solar cell used as a broad band photodetector. Operating conditions compatible with both lighting and information transfer have been identified. This work paves the way toward an all nanocrystal-based communication setup.
Published: 2020

10. Near to Long-Wave Infrared Mercury Chalcogenide Nanocrystals from Liquid Mercury

Author: Sandrine Ithurria, Nicolas Goubet, Junling Qu, Sang-Soo Chee, Yimin Zhang, Charlie Gréboval, Prachi Rastogi, Xiang Zhen Xu, Emmanuel Lhuillier, Audrey Chu, Gregory Cabailh, Mayank Goyal, Maxime Thomas, De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et d'Etude des Matériaux (LPEM), ESPCI ParisTech-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Oxydes en basses dimensions (INSP-E9), ANR: copin, ANR: Iper-nano2,Iper-nano2, ANR: frontal, ANR-11-IDEX-0004-02/10-LABX-0067,MATISSE,MATerials, InterfaceS, Surfaces, Environment(2011), ANR: graskop,graskop, European Project: 756225,blackQD, Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-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), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), and ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019)
Subjects: Materials science, Long wave infrared, Infrared, Chalcogenide, Infrared spectroscopy, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, HgTe, nanocrystal, chemistry.chemical_compound, Colloid, Physical and Theoretical Chemistry, infarred, liquid mercury, business.industry, Photoconductivity, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Mercury (element), General Energy, chemistry, Nanocrystal, Optoelectronics, 0210 nano-technology, business
Abstract: International audience; HgTe nanocrystals are currently the most promising colloidal material for infrared detection, combining broadly tunable infrared absorption and photoconductive properties. Current synthesis leads to a limited amount of material and relies on a highly toxic water-soluble form of Hg. Here, we explore the possibility of using Hg thiolate as Hg source and demonstrate that the latter can be formed in situ from liquid Hg. The developed protocol allows large masses (7 g) and highly concentrated (100 g/L) synthesis, which is a step forward for the transfer of this material towards industry. The transport properties of the material have also been investigated and we observe a transition from p to n-type with size. We observe that the threshold of the p to n switch depends on the growth method which enables for a given size of nanocrystal the formation of p-n junction. This work has great potential to design infrared sensor with optimized charge dissociation.
Published: 2020

11. Pushing absorption of perovskite nanocrystals into the infrared

Author: Gilles Patriarche, Adrien Khalili, Lenart Dudy, Audrey Chu, Grégory Vincent, Sang-Soo Chee, Xiang Zhen Xu, Charlie Gréboval, Prachi Rastogi, Ulrich Nguétchuissi Noumbé, Mathieu G. Silly, Hervé Cruguel, Junling Qu, Aloyse Degiron, Mayank Goyal, Sandrine Ithurria, Bruno Gallas, Jean-Francois Dayen, Emmanuel Lhuillier, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), 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), Nanostructures et optique (INSP-E4), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), DOTA, ONERA, Université Paris Saclay [Palaiseau], ONERA-Université Paris-Saclay, ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), European Project: 756225,blackQD, lhuillier, emmanuel, APPEL À PROJETS GÉNÉRIQUE 2018 - Nanocristaux de perovskite inorganique pour la nanophotonique - - IPER-Nano22018 - ANR-18-CE30-0023 - AAPG2018 - VALID, Nanocristaux Colloïdaux Dopés Infrarouges - - FRONTAL2019 - ANR-19-CE09-0017 - AAPG2019 - VALID, Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge - - COPIN2019 - ANR-19-CE24-0022 - AAPG2019 - VALID, Sorbonne Universités à Paris pour l'Enseignement et la Recherche - - SUPER2011 - ANR-11-IDEX-0004 - IDEX - VALID, Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides - - GRaSkop2019 - ANR-19-CE09-0026 - AAPG2019 - VALID, ERC blackQD - blackQD - 756225 - INCOMING, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique
Subjects: Electron mobility, Materials science, Bioengineering, 02 engineering and technology, 7. Clean energy, nanocrystal, field effect transistor, plasmonic resonator, General Materials Science, Perovskites, Absorption (electromagnetic radiation), perovskite, Perovskite (structure), light matter-coupling, [CHIM.MATE] Chemical Sciences/Material chemistry, business.industry, Mechanical Engineering, Doping, short-wave infrared, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Formamidinium, Nanocrystal, infrared, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, resonator, 0210 nano-technology, business, Hybrid material, Formamidinium lead iodine, Dark current
Abstract: International audience; To date defect-tolerance electronic structure of Lead halide perovskite nanocrystals is limited to optical feature in the visible range. Here, we demonstrate that IR sensitization of formamidinium lead iodine (FAPI) nanocrystals array can be obtained by its doping with PbS nanocrystals. In this hybrid array, absorption comes from the PbS nanocrystals while transport is driven by the perovskite which reduces the dark current compared to pristine PbS. In addition, we fabricate a field-effect transistor using a high capacitance ionic glass made of hybrid FAPI/PbS nanocrystal arrays. We show that the hybrid material has an n-type nature with an electron mobility of 2 x 10-3 cm2 V-1s-1. However, the dark current reduction is mostly balanced by a loss of absorption. To overcome this limitation, we couple the FAPI/PbS hybrid to a guided mode resonator, that can enhance the infrared light absorption.
Published: 2020

12. Electronic properties of (Sb;Bi)2Te3 colloidal heterostructured nanoplates down to the single particle level

Author: Wasim J. Mir, Alexandre Assouline, Clément Livache, Bertille Martinez, Nicolas Goubet, Xiang Zhen Xu, Gilles Patriarche, Sandrine Ithurria, Hervé Aubin, and Emmanuel Lhuillier
Subjects: lcsh:R, lcsh:Medicine, lcsh:Q, lcsh:Science
Abstract: We investigate the potential use of colloidal nanoplates of Sb2Te3 by conducting transport on single particle with in mind their potential use as 3D topological insulator material. We develop a synthetic procedure for the growth of plates with large lateral extension and probe their infrared optical and transport properties. These two properties are used as probe for the determination of the bulk carrier density and agree on a value in the 2–3 × 1019 cm−3 range. Such value is compatible with the metallic side of the Mott criterion which is also confirmed by the weak thermal dependence of the conductance. By investigating the transport at the single particle level we demonstrate that the hole mobility in this system is around 40 cm2V−1s−1. For the bulk material mixing n-type Bi2Te3 with the p-type Sb2Te3 has been a successful way to control the carrier density. Here we apply this approach to the case of colloidally obtained nanoplates by growing a core-shell heterostructure of Sb2Te3/Bi2Te3 and demonstrates a reduction of the carrier density by a factor 2.5.
Published: 2017

13. Azobenzene as Light-Activable Carrier Density Switches in Nanocrystals

Author: Hervé Cruguel, Sandrine Ithurria, Xiang Zhen Xu, Nicolas Goubet, Charlie Gréboval, Junling Qu, Audrey Chu, Prachi Rastogi, Mathieu G. Silly, Clément Livache, Emmanuel Lhuillier, Rémi Plamont, Yoann Prado, Bertille Martinez, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), University of Twente [Netherlands], 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), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), 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), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), European Project: 756225,blackQD, Biomolecular Nanotechnology, and University of Twente
Subjects: Materials science, business.industry, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, n/a OA procedure, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Optical pumping, Dipole, General Energy, Nanocrystal, Impurity, Optoelectronics, Molecule, Physical and Theoretical Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology, business, Excitation, Cis–trans isomerism, Visible spectrum
Abstract: International audience; Control of carrier density in colloidal quantum dots is a major challenge for their integration into optoelectronic devices. Several chemical methods have been proposed to reach this goal including: introduction of impurities, non-stoichiometric compounds, introduction of redox molecules as ligands and surface gating obtained by tuning the dipole associated with surface ligands. None of these techniques allows post synthesis tunability. Alternatively, optical pumping requires high excitation power which may heat and finally damage the sample. Here, we propose a new procedure based on grafting of azobenzenes (AZBs) on the nanocrystal surface. The AZBs have two conformations (cis and trans), which are associated with strongly different dipole moments. The transition from one conformation to the other can be activated using UV or visible light at low intensities (
Published: 2019

14. Prevalence of intestinal helminth infections in Jiangsu Province, eastern China; a cross-sectional survey conducted in 2015

Author: Yang Dai, Cao Jun, Hai-tao Yang, Ming-Xue Shen, Jian-feng Liu, Xiaoting Wang, Xiang-Zhen Xu, and Xiao-Lin Jin
Subjects: 0301 basic medicine, Male, Rural Population, Urban Population, Cross-sectional study, Helminthiasis, Feces, Soil, 0302 clinical medicine, Risk Factors, Prevalence, 030212 general & internal medicine, Intestinal Diseases, Parasitic, Survey, Child, Intestinal parasitic infection, Clonorchis sinensis, Transmission (medicine), Middle Aged, Stratified sampling, Jiangsu province, Infectious Diseases, Ancylostoma duodenale, Child, Preschool, Female, Research Article, Adult, medicine.medical_specialty, China, Eastern China, Adolescent, 030106 microbiology, Biology, lcsh:Infectious and parasitic diseases, 03 medical and health sciences, Young Adult, Environmental health, Helminths, parasitic diseases, medicine, Animals, Humans, lcsh:RC109-216, Aged, Public health, Infant, biology.organism_classification, Cross-Sectional Studies
Abstract: Background Intestinal helminth infections are a serious public health problem in developing countries. Jiangsu, an eastern coastal province of China, has an environment conducive to the transmission of intestinal parasites, and suffered human infection rates of 71.75% in 1990. Due to comprehensive anti-transmission measures undertaken throughout the province in the 1990s, the prevalence had decreased to 9.28% in 2002. In order to assess the current epidemic situation for intestinal parasitic infections in Jiangsu province, a province-wide cross-sectional survey was carried out in 2015. Methods Surveys were conducted in two main settings; rural (for soil-transmitted parasites) and urban (for Clonorchis sinensis), selected through stratified random sampling. Human infection rates were evaluated through the detection of helminth eggs or cysts (oocysts or trophozoites) of intestinal protozoa in fecal samples by microscopy. Secondary intermediate and reservoir hosts were surveyed for C. sinensis infection. Questionnaires were completed by each participant to evaluate knowledge, attitude and practice of soil-transmitted parasite and C. sinensis avoidance. Results 115 out of 30153 participants (0.38%) had intestinal helminths or protozoa. There were eight species of helminth detected and the most common parasite was the hookworm Ancylostoma duodenale. In rural settings, there were significant differences in infection rates between participants of differing economic status. In urban settings, only four cases of C. sinensis infection were detected. However, secondary intermediate and reservoir hosts were found to harbor parasites. The questionnaire survey revealed that 38.42% participants were not aware of how humans become infected by hookworms. Knowledge and awareness of C. sinensis was similarly low, with 53.22% participants combining the use of chopping boards for raw and cooked food items when preparing meals. Conclusions The prevalence of intestinal parasitic infections in Jiangsu Province in eastern China has decreased from 71.57% in 1990 to 0.38% in 2015. Control measures should now focus on parasitic infections in the elderly and in children, health promotion and the development of alternative detection methods. Electronic supplementary material The online version of this article (10.1186/s12879-019-4264-0) contains supplementary material, which is available to authorized users.
Published: 2019

15. Polyoxometalate as Control Agent for the Doping in HgSe Self-Doped Nanocrystals

Author: Elisa Meriggio, Mathieu G. Silly, Emmanuel Lhuillier, Hervé Cruguel, Emmanuelle Lacaze, Clément Livache, Bertille Martinez, Florence Volatron, Gregory Cabailh, Sandrine Ithurria, Xiang Zhen Xu, Anna Proust, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Oxydes en basses dimensions (INSP-E9), 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), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Inorganique et Matériaux Moléculaires (CIM2), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), and European Project: 756225,blackQD
Subjects: Materials science, Physics::Optics, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, nanocrystal, Condensed Matter::Superconductivity, self doping, Physical and Theoretical Chemistry, Absorption (electromagnetic radiation), Astrophysics::Galaxy Astrophysics, Plasmon, POM, business.industry, Doping, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, Polyoxometalate, Optoelectronics, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, business, Doped nanocrystals
Abstract: International audience; Intraband and plasmonic transitions have appeared over the last years as an interesting tool to achieve optical absorption in the mid infrared. Tuning the doping magnitude has become a major challenge not only to tune the optical spectrum but also properties such as the dark current or the time response. Here we investigate the case of self-doped HgSe colloidal quantum dots (CQDs). Tuning of the doping was so far relying on band bending induced by a dipole design at the nanoparticle surface. With such a surface gating approach, it is difficult to conciliate both the massive tuning of the Fermi level with the preservation of transport properties of the CQD arrays. Here we propose a strategy to graft functionalized polyoxometalates (POMs) at the CQD surface and obtain simultaneously a massive tuning of the carrier density (≈5 electrons per nanoparticle) and conduction properties. We bring a consistent demonstration of the HgSe CQD doping decrease by a charge transfer to the POM. This method is highly promising for large tuning of carrier density in degenerately doped semiconductor nanoparticles.
Published: 2018

16. Wavefunction engineering in HgSe/HgTe colloidal heterostructures to enhance mid infrared photoconductive properties

Author: Nicolas Goubet, Sébastien Royer, Sandrine Ithurria, Bertille Martinez, Hervé Cruguel, Xiang Zhen Xu, Emmanuel Lhuillier, Clément Livache, Mathieu G. Silly, Gilles Patriarche, Benoit Dubertret, Abdelkarim Ouerghi, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-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), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-15-CE24-0016,H2DH,Hétérostructures bi-dimendionnelles hybrides pour l'optoélectronique(2015), ANR-15-CE09-0014,NanoDoSe,Dopage de Nanocristaux Semiconducteurs par chimie douce(2015), European Project: 756225,blackQD, Physico-chimie et dynamique des surfaces ( INSP-E6 ), Institut des Nanosciences de Paris ( INSP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique et d'Etude des Matériaux ( LPEM ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -ESPCI ParisTech-Centre National de la Recherche Scientifique ( CNRS ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Nanosciences et de Nanotechnologies [Marcoussis] ( C2N ), Université Paris-Sud - Paris 11 ( UP11 ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Synchrotron SOLEIL ( SSOLEIL ), Centre National de la Recherche Scientifique ( CNRS ), ANR-11-IDEX-0004-02/10-LABX-0067,MATISSE,MATerials, InterfaceS, Surfaces, Environment ( 2011 ), ANR : H2DH, ANR : nanodose, European Project : 756225,blackQD, and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, nanpocrystal, Infrared spectroscopy, Bioengineering, intraband transition, 02 engineering and technology, Photodetection, 010402 general chemistry, intraband, 7. Clean energy, 01 natural sciences, Condensed Matter::Materials Science, HgSe/HgTe heterostructures, Condensed Matter::Superconductivity, General Materials Science, heterostrcture, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Wave function, narrow band gap nanocrystals, [PHYS]Physics [physics], [ PHYS ] Physics [physics], business.industry, Mechanical Engineering, Photoconductivity, Doping, Heterojunction, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermal conduction, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, mid infrared, 0104 chemical sciences, Wavelength, [ CHIM.MATE ] Chemical Sciences/Material chemistry, infrared, Optoelectronics, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, business, [ PHYS.COND ] Physics [physics]/Condensed Matter [cond-mat]
Abstract: The use of intraband transition is an interesting alternative path for the design of optically active complex colloidal materials in the mid-infrared range. However, so far, the performance obtained for photodetection based on intraband transition remains much smaller than the one relying on interband transition in narrow-band-gap materials operating at the same wavelength. New strategies have to be developed to make intraband materials more effective. Here, we propose growing a heterostructure of HgSe/HgTe as a means of achieving enhanced intraband-based photoconduction. We first tackle the synthetic challenge of growing a heterostructure on soft (Hg-based) material. The electronic spectrum of the grown heterostructure is then investigated using a combination of numerical simulation, infrared spectroscopy, transport measurement, and photoemission. We report a type-II band alignment with reduced doping compared with a core-only object and boosted hole conduction. Finally, we probe the photoconductive properties of the heterostructure while resonantly exciting the intraband transition by using a high-power-density quantum cascade laser. Compared to the previous generation of material based on core-only HgSe, the heterostructures have a lower dark current, stronger temperature dependence, faster photoresponse (with a time response below 50 μs), and detectivity increased by a factor of 30.
Published: 2018

17. Intraband transition in self-doped narrow band gap colloidal quantum dots

Author: Hervé Aubin, Bertille Martinez, Xiang Zhen Xu, Hervé Cruguel, Adrien Robin, Sandrine Ithurria, Clément Livache, Sébastien Royer, Emmanuel Lhuillier, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-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 ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011)
Subjects: Materials science, Infrared, Mid-IR, self-doping, 02 engineering and technology, Photodetection, 010402 general chemistry, 01 natural sciences, Absorption, nanocrystal, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, Doping, Work function, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Absorption (electromagnetic radiation), narrow band gap, Condensed matter physics, business.industry, Quantum dots, mid-infrared, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Nanocrystals, Nanocrystal, Quantum dot, Optoelectronics, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, business, Order of magnitude
Abstract: International audience; In this article we discuss the infrared properties of self-doped nanocrystals and in particular the case of HgSe. HgSe colloidal quantum dots have recently been reported for their tunable optical features all over the mid infrared from 3 to 20 μm. Their optical absorption is a combination of interband absorption at high energy and intraband absorption at low energy. The latter results from the self-doped character of HgSe. The origin of this self-doping is also discussed. We demonstrated that the doping results from the combination of the narrow band gap and high work function of HgSe, which leads to a reduction of the CQD by the water in the environment. In addition, we demonstrated that the doping density can be tuned over an order of magnitude thanks to the control of the capping ligands.
Published: 2017

18. Infrared Photodetection Based on Colloidal Quantum-Dot Films with High Mobility and Optical Absorption up to THz

Author: Brice Nadal, Gilles Patriarche, Xiang Zhen Xu, Patrick Hease, Hervé Aubin, Benoit Dubertret, Nicolas Lequeux, Emmanuel Lhuillier, Sandrine Ithurria, Marion Scarafagio, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Nexdot, 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), Laboratoire de photonique et de nanostructures (LPN), and Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Infrared, Photodetector, mid-and far-infrared, Bioengineering, Nanotechnology, 02 engineering and technology, Photodetection, 010402 general chemistry, 01 natural sciences, colloidal quantum dot, General Materials Science, photoresponse, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Absorption (electromagnetic radiation), business.industry, Mechanical Engineering, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, HgSe, 0104 chemical sciences, Semiconductor, Quantum dot, Optoelectronics, transistor, Infrared detector, 0210 nano-technology, business, electrolyte gating, Molecular beam epitaxy
Abstract: International audience; Infrared thermal imaging devices rely on narrow band gap semiconductors grown by physical methods such as molecular beam epitaxy and chemical vapor deposition. These technologies are expensive, and infrared detectors remain limited to defense and scientific applications. Colloidal quantum dots (QDs) offer a low cost alternative to infrared detector by combining inexpensive synthesis and an ease of processing, but their performances are so far limited, in terms of both wavelength and sensitivity. Herein we propose a new generation of colloidal QD-based photodetectors, which demonstrate detectivity improved by 2 orders of magnitude, and optical absorption that can be continuously tuned between 3 and 20 μm. These photodetectors are based on the novel synthesis of n-doped HgSe colloidal QDs whose size can be tuned continuously between 5 and 40 nm, and on their assembly into solid nanocrystal films with mobilities that can reach up to 100 cm 2 V −1 s −1. These devices can be operated at room temperature with the same level of performance as the previous generation of devices when operated at liquid nitrogen temperature. HgSe QDs can be synthesized in large scale (>10 g per batch), and we show that HgSe films can be processed to form a large scale array of pixels. Taken together, these results pave the way for the development of the next generation mid-and far-infrared low-cost detectors and camera.
Published: 2016

19. Investigating the n- and p-Type Electrolytic Charging of Colloidal Nanoplatelets

Author: Thierry Douillard, Benoit Dubertret, Pierre-Louis Taberna, Emmanuel Lhuillier, Patrice Simon, Sandrine Ithurria, Armel Descamps-Mandine, Hervé Aubin, Xiang Zhen Xu, Rémi Castaing, Nexdot, 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), 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), Consortium Lyon Saint-Etienne de Microscopie (CLYM), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-École Centrale de Lyon (ECL), Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-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 interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National des Sciences Appliquées de Lyon - INSA (FRANCE), Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Claude Bernard-Lyon I - UCBL (FRANCE), Ecole supérieure de physique et de chimie industrielles ParisTech - ESPCI (FRANCE), Nexdot (FRANCE), PSL Research University (FRANCE), Laboratoire de Physique et d’Etude des Matériaux - LPEM (Paris, France), École normale supérieure de Lyon (ENS de Lyon)-École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), 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), 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), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
Subjects: Materials science, Matériaux, Transistor, Capacitance, Nanotechnology, Electrolyte, Gating, [CHIM.MATE]Chemical Sciences/Material chemistry, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Nanoplatelet, Colloid, General Energy, [CHIM.GENI]Chemical Sciences/Chemical engineering, Nanocrystal, law, Génie chimique, Electrolyte gating, Physical and Theoretical Chemistry
Abstract: International audience; We investigate the ion gel gating of 2D colloidal nanoplatelets. We propose a simple, versatile, and air-operable strategy to build electrolyte-gated transistors. We provide evidence that the charges are injected in the quantum states of the nanocrystals. The gating is made possible by the presence of large voids into the NPL films and is sensitive to the availability of the nanocrystals surface.
Published: 2015

20. Icariin derivative inhibits inflammation through suppression of p38 mitogen-activated protein kinase and nuclear factor-kappaB pathways

Author: Xiang-Zhen Xu, Shaorui Chen, Lian-Quan Gu, Yu-Hua Wang, Peiqing Liu, Suowen Xu, and Jianwen Chen
Subjects: MAPK/ERK pathway, Lipopolysaccharides, Cell Survival, p38 mitogen-activated protein kinases, Blotting, Western, Cell Culture Techniques, Pharmaceutical Science, Nitric Oxide Synthase Type II, p38 Mitogen-Activated Protein Kinases, Cell Line, chemistry.chemical_compound, Mice, Animals, Edema, Protein kinase A, Pharmacology, Cell Nucleus, Flavonoids, biology, Molecular Structure, Chemistry, Reverse Transcriptase Polymerase Chain Reaction, Macrophages, Anti-Inflammatory Agents, Non-Steroidal, NF-kappa B, Transcription Factor RelA, General Medicine, Flavones, Cell biology, Nitric oxide synthase, Protein Transport, Biochemistry, Cyclooxygenase 2, Mitogen-activated protein kinase, biology.protein, Phosphorylation, Tumor necrosis factor alpha, Icariin
Abstract: In this study we investigated the anti-inflammatory effects of an icariin derivative (3,5-dihydroxy-4'-methoxy-6'',6''-dimethy1-4'',5''-dihydropyrano[2'',3'':7,8]-flavone). We found that this icariin derivative inhibits tumor necrosis factor-alpha (TNF-alpha) production, inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) mRNA expression, and protein expression in lipopolysaccharide (LPS) stimulated RAW264.7 macrophages. It also alleviates paw edema induced by carrageenan in mice. To clarify the molecular mechanisms underlying these anti-inflammatory effects, we examined the effects of this compound on the phosphorylation of mitogen-activated protein kinase (MAPK), phosphorylation of inhibitory kappaBalpha (IkappaBalpha), and nuclear translocation of p65 subunit of nuclear factor (NF)-kappaB, and found it suppresses the activation of p38 MAPK and inhibits translocation of NF-kappaB p65 to the nucleus through decreasing the phosphorylation of IkappaBalpha. As a result of these properties, this icariin derivative can be considered as a potential drug for inflammatory diseases.
Published: 2010

21. Evaluation of foam cell formation in cultured macrophages: an improved method with Oil Red O staining and DiI-oxLDL uptake

Author: Si Gao, Xiang-Zhen Xu, Shaorui Chen, Jianwen Chen, Yan Huang, Suowen Xu, Peiqing Liu, Tian Lan, Kang Le, Yu Xie, Xiaoyan Shen, and Heqing Huang
Subjects: medicine.diagnostic_test, Clinical Biochemistry, Biomedical Engineering, Nile red, Bioengineering, Cell Biology, Biology, Molecular biology, Flow cytometry, Staining, chemistry.chemical_compound, Biochemistry, chemistry, In vivo, Lipid droplet, medicine, Technical Note, Oil Red O, lipids (amino acids, peptides, and proteins), Intracellular, Biotechnology, Foam cell
Abstract: Macrophage-derived foam cell formation elicited by oxidized low-density lipoprotein (oxLDL) is the hallmark of early atherogenesis. Detection of foam cell formation is conventionally practiced by Oil Red O (ORO) staining of lipid-laden macrophages. Other methods include 1,1′-dioctadecyl-3,3,3′3′-tetra-methylindocyanide percholorate (DiI)-labeled oxLDL (DiI-oxLDL) uptake and Nile Red staining. The purpose of the present study is to report an optimized method for assessing foam cell formation in cultured macrophages by ORO staining and DiI-oxLDL uptake. After incubation with oxLDL (50 μg/ml) for 24 h, the macrophages were fixed, stained with ORO for just 1 min, pronounced lipid droplets were clearly observed in more than 90% of the macrophages. To test the in vivo applicability of this method, lesions (or foam cells) of cryosections of aortic sinus or primary mouse peritoneal macrophages from ApoE deficient mice fed a high cholesterol diet were successfully stained. In another set of experiments, treatment of macrophages with DiI-oxLDL (10 μg/ml) for 4 h resulted in significant increase in oxLDL uptake in macrophages as demonstrated by confocol microscopy and flow cytometry. We conclude that the optimized ORO staining and fluorescent labeled oxLDL uptake techniques are very useful for assessing intracellular lipid accumulation in macrophages that are simpler and more rapid than currently used methods.
Published: 2010

22. Evidence suggesting superconductivity at 250 k in a sequentially deposited cuprate film

Author: Christophe Hatterer, C. F. Beuran, Michel Laguës, Xiao Ming Xie, Xiang Zhen Xu, Catherine Deville-Cavellin, Vincent Mairet, and Hassan Tebbji
Subjects: Superconductivity, Multidisciplinary, Materials science, Condensed matter physics, Transition temperature, Inorganic chemistry, Epitaxy, Magnetic susceptibility, Magnetization, Electrical resistivity and conductivity, Condensed Matter::Superconductivity, Diamagnetism, Condensed Matter::Strongly Correlated Electrons, Cuprate
Abstract: An artificial cuprate compound belonging to the BiSrCaCuO family with eight adjacent sequetially imposed layer epitaxy. This compound undergoes a five order of magnitude resistivity drop with an onset near 280 kelvin and an offset at 250 kelvin. It exhibits a diamagnetic variation of susceptibility and magnetization below 290 kelvin. Additional observed features, such as strongly nonlinear conductivity, suggests superconductivity as a plausible explanation of the properties of this compound.
Published: 1993

23. Terahertz HgTe Nanocrystals: Beyond Confinement

Author: Clément Livache, Hervé Portalès, Ricardo P. S. M. Lobo, Nicolas Goubet, Xiang Zhen Xu, Emmanuel Lhuillier, Benoit Dubertret, Bertille Martinez, Amardeep Jagtap, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-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), 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), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), and European Project: 756225,blackQD
Subjects: Infrared, Terahertz radiation, business.industry, Chemistry, Transistor, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Biochemistry, Catalysis, Cutoff frequency, 0104 chemical sciences, Shape control, law.invention, Colloid and Surface Chemistry, Charge-carrier density, Nanocrystal, law, Optoelectronics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology, business
Abstract: International audience; We report the synthesis of nanocrystals with an optical feature in the THz range. To do so, we develop a new synthetic procedure for the growth of HgTe, HgSe, and HgS nanocrystals, with strong size tunability from 5 to 200 nm. This is used to tune the absorption of the nanocrystals all over the infrared range up to terahertz (from 2 to 65 μm for absorption peak and even 200 μm for cutoff wavelength). The interest for this procedure is not limited to large sizes since for small objects we demonstrate low aggregation and good shape control (i.e., spherical object) while using nonexpansive and simple mercury halogenide precursors. By integrating these nanocrystals into an electrolyte-gated transistor, we evidence a change of carrier density from p-doped to n-doped as the confinement is vanishing.
Full Text: View/download PDF

24. Transport in ITO Nanocrystals with Short- to Long-Wave Infrared Absorption for Heavy-Metal-Free Infrared Photodetection

Author: Nicolas Goubet, Audrey Chu, Elisa Meriggio, Charlie Gréboval, Hervé Cruguel, Gregory Cabailh, Florence Volatron, Emmanuel Lhuillier, Bertille Martinez, Junling Qu, Clément Livache, Xiang Zhen Xu, Anna Proust, Julien Ramade, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-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), Oxydes en basses dimensions (INSP-E9), Institut Parisien de Chimie Moléculaire (IPCM), Chimie Moléculaire de Paris Centre (FR 2769), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-15-CE24-0016,H2DH,Hétérostructures bi-dimendionnelles hybrides pour l'optoélectronique(2015), European Project: 756225,blackQD, Institut de Chimie du CNRS (INC)-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)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Long wave infrared, Infrared, 02 engineering and technology, Photodetection, heavy metal free, 010402 general chemistry, 7. Clean energy, 01 natural sciences, plasmon, Oxide nanocrystals, General Materials Science, photoconduction, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Absorption (electromagnetic radiation), Plasmon, photodetection, business.industry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Nanocrystal, Metal free, intraband absorption, transport, infrared, Optoelectronics, 0210 nano-technology, business
Abstract: International audience; Nanocrystals are often described as interesting materials for the design of low-cost optoelectronic devices especially in the infrared range. However the driving materials reaching infrared absorption are generally heavy metal-containing (Pb and Hg) with a high toxicity. An alternative strategy to achieve infrared transition is the use of doped semiconductors presenting intraband or plasmonic transition in the short, mid and long-wave infrared. This strategy may offer more flexibility regarding the range of possible candidate materials. In particular, significant progress have been achieved for the synthesis of doped oxides and for the control of their doping magnitude. Among them, tin doped indium oxide (ITO) is the one providing the broadest spectral tunability. Here we test the potential of such ITO nanoparticles for photoconduction in the infrared. We demonstrate that In2O3 nanoparticles present an intraband absorption in the mid infrared range which is transformed into a plasmonic feature as doping is introduced. We have determined the cross section associated with the plasmonic transition to be in the 1-3x10-13 cm 2 range. We have observed that the nanocrystals can be made conductive and photoconductive due to a ligand exchange using a short carboxylic acid, leading to a dark conduction with n-type character. We bring evidence that the observed photoresponse in the infrared is the result of a bolometric effect.
Full Text: View/download PDF

25. Revealing the Band Structure of FAPI Quantum Dot Film and Its Interfaces with Electron and Hole Transport Layer Using Time Resolved Photoemission

Author: Bertille Martinez, Dylan Amelot, Sang-Soo Chee, Abdelkarim Ouerghi, Mayank Goyal, Francesco Andrea Bresciani, Hervé Cruguel, Charlie Gréboval, Nadine Witkowski, Angshuman Nag, Xiang Zhen Xu, Emmanuel Lhuillier, Nicolas Casaretto, Mathieu G. Silly, Junling Qu, Audrey Chu, Clément Livache, Prachi Rastogi, Christophe Méthivier, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Indian Institute of Science Education and Research Pune (IISER Pune), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et d'Etude des Matériaux (LPEM), ESPCI ParisTech-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Réactivité de Surface (LRS), Centre de Nanosciences et Nanotechnologies (C2N (UMR_9001)), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0004-02/10-LABX-0067,MATISSE,MATerials, InterfaceS, Surfaces, Environment(2011), ANR: copin, ANR: frontal, ANR: graskop,graskop, European Project: 756225,blackQD, 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), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), and ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019)
Subjects: Materials science, Field (physics), business.industry, Halide, 02 engineering and technology, Electron, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 7. Clean energy, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, Nanocrystal, Quantum dot, Optoelectronics, Physical and Theoretical Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology, Electronic band structure, business, Perovskite (structure), Diode
Abstract: International audience; Lead halide perovskite nanocrystals have attracted attention in the field of nanocrystal-based light-emitting diode and solar cells, because their devices showed high performances in only a few years. Among them, CsPbI3 is a promising candidate for solar cell design in spite of a too wide band gap and severe structural stability issue. Its hybrid organic–inorganic counterpart (NH2)2CHPbI3 (FAPI), where the Cs is replaced with formamidinium (FA), presents a smaller band gap and also an improved structural stability. Here, we have investigated the energy landscape of pristine FAPI, and the interface of FAPI with electron and hole selective layers using transport, photoemission, and noncontact surface photovoltage by means of time-resolved photoemission. We have found from transport and photoemission that its Fermi level is deeply positioned in the band gap, enabling the material to be almost intrinsic. Time-resolved photoemission has revealed that the interface of pristine FAPI is bended toward downward side, which is consistent with a p-type nature for the interface (i.e., hole as majority carrier). Using TiOx and MoOx contacts, as a model for the electron and hole transport layer, respectively, allows the electron transfer from the TiOx to the FAPI and from the FAPI to the MoOx. The latter is revealed by time-resolved photoemission showing inverted band bending for the two interfaces. From these results, we clearly present the energy landscape of FAPI and its interfaces with TiOx and MoOx in the dark and under illumination. These insights are of utmost interest for the future design of FAPI-based solar cell.
Full Text: View/download PDF

26. Colloidal II–VI—Epitaxial III–V heterostructure: A strategy to expand InGaAs spectral response

Author: Adrien Khalili, Claire Abadie, Tung Huu Dang, Audrey Chu, Eva Izquierdo, Corentin Dabard, Charlie Gréboval, Mariarosa Cavallo, Huichen Zhang, Stefano Pierini, Yoann Prado, Xiang Zhen Xu, Sandrine Ithurria, Grégory Vincent, Christophe Coinon, Ludovic Desplanque, Emmanuel Lhuillier, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DOTA, ONERA, Université Paris Saclay [Palaiseau], ONERA-Université Paris-Saclay, Nanostructures et optique (INSP-E4), 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), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), EPItaxie et PHYsique des hétérostructures - IEMN (EPIPHY - IEMN), Renatech Network, ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-20-ASTR-0008,NITquantum,Design et fabrication d'un plan focal dans le proche infrarouge à base de nanocrisrtaux(2020), ANR-21-CE24-0012,BRIGHT,Diode électroluminescente infrarouge brillante par exaltation du couplage lumière-matière(2021), ANR-21-CE09-0029,MixDFerro,Heterostructures à dimensions mixtes sous contrôle ferroélectrique 2D(2021), and European Project: 756225,blackQD
Subjects: Physics and Astronomy (miscellaneous), [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: International audience; For short wave infrared (SWIR) sensing, InGaAs is the leading technology combining high carrier mobility, high homogeneity and complete control over n-top doping. In the meanwhile, numerous alternative materials have tried to compete with InGaAs. Among them, colloidal nanocrystals with narrow band gap can address the current issue in designing cost-effective sensors for the SWIR range. Rather than pitting these two materials against each other, here we design a synergistic duo in which HgTe nanocrystals are used to broaden the spectral range of InGaAs while lifting the lattice matching constraints. We propose a diode geometry where a p-type HgTe NC array is coupled with n-type InGaAs wires which are used as high mobility (µ>1000 cm 2 .V-1 s-1) minority carrier extractors. This approach also demonstrates that Van der Waals heterostructures are not limited to graphene-like materials and that bulk-like III-V semiconductors can also be light sensitized by colloidal nanoparticles. This work paves the way toward further synergies between epitaxially grown and colloidally grown semiconductors for infrared detection.
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources

Refine your results

26 results on '"Xiang Zhen Xu"'

1. Double-crowned 2D semiconductor nanoplatelets with bicolor power-tunable emission

2. Multi-intervention integrated deworming strategy for sustained control of soil-transmitted helminths infections: a case study in Jiangsu Province, China

3. Geochemical constraints on the multistage evolution of the Yilashan ophiolite, central Tibet

4. Electroluminescence from HgTe Nanocrystals and Its Use for Active Imaging

5. Optimized Cation Exchange for Mercury Chalcogenide 2D Nanoplatelets and Its Application for Alloys

6. Multi-intervention integrated deworming strategy for sustained control of soil-transmitted helminths infections: a case study in Jiangsu Province, China

7. Seeded growth of HgTe nanocrystals for shape control and their use in narrow infrared electroluminescence

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

9. A nanoplatelet-based light emitting diode and its use for all-nanocrystal LiFi-like communication

10. Near to Long-Wave Infrared Mercury Chalcogenide Nanocrystals from Liquid Mercury

11. Pushing absorption of perovskite nanocrystals into the infrared

12. Electronic properties of (Sb;Bi)2Te3 colloidal heterostructured nanoplates down to the single particle level

13. Azobenzene as Light-Activable Carrier Density Switches in Nanocrystals

14. Prevalence of intestinal helminth infections in Jiangsu Province, eastern China; a cross-sectional survey conducted in 2015

15. Polyoxometalate as Control Agent for the Doping in HgSe Self-Doped Nanocrystals

16. Wavefunction engineering in HgSe/HgTe colloidal heterostructures to enhance mid infrared photoconductive properties

17. Intraband transition in self-doped narrow band gap colloidal quantum dots

18. Infrared Photodetection Based on Colloidal Quantum-Dot Films with High Mobility and Optical Absorption up to THz

19. Investigating the n- and p-Type Electrolytic Charging of Colloidal Nanoplatelets

20. Icariin derivative inhibits inflammation through suppression of p38 mitogen-activated protein kinase and nuclear factor-kappaB pathways

21. Evaluation of foam cell formation in cultured macrophages: an improved method with Oil Red O staining and DiI-oxLDL uptake

22. Evidence suggesting superconductivity at 250 k in a sequentially deposited cuprate film

23. Terahertz HgTe Nanocrystals: Beyond Confinement

24. Transport in ITO Nanocrystals with Short- to Long-Wave Infrared Absorption for Heavy-Metal-Free Infrared Photodetection

25. Revealing the Band Structure of FAPI Quantum Dot Film and Its Interfaces with Electron and Hole Transport Layer Using Time Resolved Photoemission

26. Colloidal II–VI—Epitaxial III–V heterostructure: A strategy to expand InGaAs spectral response

Catalog

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

26 results on '"Xiang Zhen Xu"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources