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115 results on '"Prosa, T"'

10. Compositional changes of sub-20-nm Er-doped phase-separated nanoparticles in silicates

Author

Blanc, Wilfried, Martin, Isabelle, François Saint-Cyr, Hugues, Bidault, Xavier, Chaussedent, Stéphane, Hombourger, Chystel, Le Coustumer, Philippe, Lacomme, Sabrina, Neuville, Daniel R., Larson, D. J., Prosa, T. J., Guillermier, Christelle, Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Cameca, Laboratoire de Photonique d'Angers (LPHIA), Université d'Angers (UA), Géoressources et environnement, Institut Polytechnique de Bordeaux (Bordeaux INP)-Université Bordeaux Montaigne, Pôle Microscopie Electronique, Université Bordeaux Segalen - Bordeaux 2, Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), National Resource for Imaging Mass Spectroscopy (NRIMS), and Harvard University [Cambridge]-National Institutes of Health [Bethesda] (NIH)-Massachusetts Institute of Technology (MIT)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

11. Direct observations of compositional changes of sub-20-nm Er-doped phase-separated nanoparticles in optical fibers

Author

Blanc, Wilfried, Martin, Isabelle, François Saint-Cyr, Hugues, Bidault, Xavier, Chaussedent, Stéphane, Hombourger, Chystel, Le Coustumer, Philippe, Lacomme, Sabrina, Neuville, Daniel R., Larson, D. J., Prosa, T. J., Guillermier, Christelle, Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Cameca, Laboratoire de Photonique d'Angers (LPHIA), Université d'Angers (UA), Géoressources et environnement, Institut Polytechnique de Bordeaux (Bordeaux INP)-Université Bordeaux Montaigne, Pôle Microscopie Electronique, Université Bordeaux Segalen - Bordeaux 2, Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), National Resource for Imaging Mass Spectroscopy (NRIMS), and Harvard University [Cambridge]-National Institutes of Health [Bethesda] (NIH)-Massachusetts Institute of Technology (MIT)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

12. Best practices for reporting atom probe analysis of geological materials

Author

Blum, T., Darling, J., Kelly, T., Larson, D., Moser, D., Perez-Huerta, A., Prosa, T., Reddy, Steven, Reinhard, D., Saxey, David, Ulfig, R., Valley, J., Blum, T., Darling, J., Kelly, T., Larson, D., Moser, D., Perez-Huerta, A., Prosa, T., Reddy, Steven, Reinhard, D., Saxey, David, Ulfig, R., and Valley, J.

Abstract

The application of atom probe tomography (APT) within the Earth and planetary sciences has produced novel data sets that answer fundamental questions about the near-atomic scale distribution of elements and isotopes within minerals. It involves the incremental evaporation, detection, and subsequent computer reconstruction of charged particles from a needle-shaped specimen. The range of applications is growing such that protocols for reporting are needed for APT data comparison and quality assessment among natural materials. A particular challenge of APT science relates to documenting the instrumental and analyst-dependent conditions that affect the mass spectral and spatial qualities of the data and their interpretation. This contribution outlines recommended data reporting procedures for publication of ATP data in terms of the sample preparation, data collection, and reconstruction phases as well as the characterization and interpretation of the reconstructed volume. Coordinated reporting of this basic information will promote efficient communication of protocols, and aid in the evaluation of published atom probe data as geologists continue to explore atomic compositions and distributions at nanoscale.

Published
2017

13. Direct Observations of Compositional Changes at the Early Stages of Er-doped Phase Separated Nanoparticles in Silicate Glasses

Author

Francois-Saint-Cyr, H., Martin, I., Xavier Bidault, Stéphane Chaussedent, Lecoustumer, P., Chystel Hombourger, Daniel Neuville, Larson, D. J., Prosa, T. J., Guillermier, C., Blanc, W., Cameca, Laboratoire de Photonique d'Angers (LPHIA), Université d'Angers (UA), CDGA, Université Sciences et Technologies - Bordeaux 1, Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), National Resource for Imaging Mass Spectroscopy (NRIMS), Massachusetts Institute of Technology (MIT)-Harvard University [Cambridge]-National Institutes of Health [Bethesda] (NIH), Laboratoire de physique de la matière condensée (LPMC), Centre National de la Recherche Scientifique (CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Géoressources et environnement, Institut Polytechnique de Bordeaux (Bordeaux INP)-Université Bordeaux Montaigne, and Harvard University [Cambridge]-National Institutes of Health [Bethesda] (NIH)-Massachusetts Institute of Technology (MIT)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

14. Multiscale Self-Assembly of Quantum Dots into an Anisotropic Three-Dimensional Random Network

Author

Ilday, S., Ilday, F., Hübner, R., Prosa, T., Martin, I., Nogay, G., Kabacelik, I., Mics, Z., Turchinovich, D., Ustunel, H., Toffoli, D., Friedrich, D., Schmidt, B., Heinig, K.-H., and Turan, R.

Abstract

One of the well-known challenges in design of nanomaterials is to simultaneously achieve material properties pertaining to few-atom scale and bulk properties through which the material connects to other materials or interacts with devices. This is difficult because properties arising from physics at different scales are often mutually exclusive. An important example is the 30 year-old problem of realizing a connected-but-confined Si nanostructure embedded in a dielectric matrix (e.g., SiO2) that simultaneously brings together quantum-dot (QD)-like optical properties and good electrical conduction. Here, we solve this problem through creation of a hierarchically self-assembled anisotropic random network of Si QDs: At the atomic scale, QDs are formed, which sparsely interconnect without inflating their diameters to form an isotropic random network, and larger scales, this network becomes anisotropic, preferentially growing in the vertical direction to form nanowire-like structures. We report simultaneous achievement of good electrical conductivity (~0.1 S/cm) and a bandgap tuneable over the visible light range (from 1.8 to 2.7 eV). In order to determine how to self-assemble such a topology without using advanced control over dynamical details of the system, we developed a toy model of the stochastic deposition process, from which we related the intended topology to parameters governing stochastic growth and determined the experimental conditions that can give rise to it. Monte Carlo and Molecular Dynamics simulations are performed to guide our methodology and fabrication was done using magnetron sputter deposition. The two leverages that we used for multiscale self-assembly were as follows: (i) We keep the substrate “cold” and adjust how “hot” the deposited particles are. This way, we create spatio-temporal temperature gradients on the surface and thereby, we control surface diffusion and promote vertical growth in the microscale resembling nanowires. (ii) We fine-tune the thin-film stoichiometry in order to control the phase-separation. This way, we control the nominally unstable medium that QDs are embedded in and limit further inflation of their diameters in the atomic scale. This way we show that self-assembly under nonequilibrium conditions and nonlinear dynamics sweeps aside a large number of factors that influence the details of thin-film growth, but provides a couple of simple “rules” (with clearly identifiable corresponding experimental conditions) to determine the final morphology. The generality and material-independence of this methodology is strongly suggestive of possibility to apply it to solve a variety of other nanomaterial problems, which also pertain to multiple scales.

Published
2016

15. Atomic-scale age resolution of planetary events

Author

White, L. F., primary, Darling, J. R., additional, Moser, D. E., additional, Reinhard, D. A., additional, Prosa, T. J., additional, Bullen, D., additional, Olson, D., additional, Larson, D. J., additional, Lawrence, D., additional, and Martin, I., additional

Published
2017
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16. Multiscale Self-Assembly of Silicon Quantum Dots into an Anisotropic Three-Dimensional Random Network

Author

Ilday, S., Ilday, F. O., Hübner, R., Prosa, T. J., Martin, I., Nogay, G., Kabacelik, I., Mics, Z., Bonn, M., Turchinovich, D., Toffoli, H., Toffoli, D., Friedrich, D., Schmidt, B., Heinig, K.-H., Turan, R., Ilday, S., Ilday, F. O., Hübner, R., Prosa, T. J., Martin, I., Nogay, G., Kabacelik, I., Mics, Z., Bonn, M., Turchinovich, D., Toffoli, H., Toffoli, D., Friedrich, D., Schmidt, B., Heinig, K.-H., and Turan, R.

Abstract

Multiscale self-assembly is ubiquitous in nature but its deliberate use to synthesize multifunctional three-dimensional materials remains rare, partly due to the notoriously difficult problem of controlling topology from atomic to macroscopic scales to obtain intended material properties. Here, we propose a simple, modular, noncolloidal methodology that is based on exploiting universality in stochastic growth dynamics and driving the growth process under far-from-equilibrium conditions toward a preplanned structure. As proof of principle, we demonstrate a confined-butconnected solid structure, comprising an anisotropic random network of silicon quantum-dots that hierarchically self-assembles from the atomic to the microscopic scales. First, quantum-dots form to subsequently interconnect without inflating their diameters to form a random network, and this network then grows in a preferential direction to form undulated and branching nanowire-like structures. This specific topology simultaneously achieves two scale-dependent features, which were previously thought to be mutually exclusive: good electrical conduction on the microscale and a bandgap tunable over a range of energies on the nanoscale.

Published
2016

17. Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy

Author

Reddy, Steven, van Riessen, A., Saxey, D., Johnson, T., Rickard, W., Fougerouse, D., Fischer, S., Prosa, T., Rice, K., Reinhard, D., Chen, Y., Olson, D., Reddy, Steven, van Riessen, A., Saxey, D., Johnson, T., Rickard, W., Fougerouse, D., Fischer, S., Prosa, T., Rice, K., Reinhard, D., Chen, Y., and Olson, D.

Abstract

The widespread use of zircon in geochemical and geochronological studies of crustal rocks is underpinned by an understanding of the processes that may modify its composition. Deformation during tectonic and impact related strain is known to modify zircon trace element compositions, but the mechanisms by which this occurs remain unresolved. Here we combine electron backscatter diffraction, transmission Kikuchi diffraction and atom probe microscopy to investigate trace element migration associated with a ~20 nm wide, 2° low-angle subgrain boundary formed in zircon during a single, high-strain rate, deformation associated with a bolide impact. The low-angle boundary shows elevated concentrations of both substitutional (Y) and interstitial (Al, Mg and Be) ions. The observed compositional variations reflect a dynamic process associated with the recovery of shock-induced vacancies and dislocations into lower energy low-angle boundaries. Y segregation is linked to the migration and localisation of oxygen vacancies, whilst the interstitial ions migrate in association with dislocations. These data represent the direct nanoscale observation of geologically-instantaneous, trace element migration associated with crystal plasticity of zircon and provide a framework for further understanding mass transfer processes in zircon.

Published
2016

24. Atom Probe Tomography of Oxide Scales

Author

Stiller, K., primary, Viskari, L., additional, Sundell, G., additional, Liu, F., additional, Thuvander, M., additional, Andrén, H.-O., additional, Larson, D. J., additional, Prosa, T., additional, and Reinhard, D., additional

Published
2012
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26. Toward atom probe tomography of microelectronic devices

Author

Larson, D J, primary, Lawrence, D, additional, Lefebvre, W, additional, Olson, D, additional, Prosa, T J, additional, Reinhard, D A, additional, Ulfig, R M, additional, Clifton, P H, additional, Bunton, J H, additional, Lenz, D, additional, Olson, J D, additional, Renaud, L, additional, Martin, I, additional, and Kelly, T F, additional

Published
2011
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