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Your search keyword '"Nanostructures et Rayons X (NRX)"' showing total 3 results
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3 results on '"Nanostructures et Rayons X (NRX)"'

1. Imaging the strain evolution of a platinum nanoparticle under electrochemical control

Author

Clément Atlan, Corentin Chatelier, Isaac Martens, Maxime Dupraz, Arnaud Viola, Ni Li, Lu Gao, Steven J. Leake, Tobias U. Schülli, Joël Eymery, Frédéric Maillard, Marie-Ingrid Richard, European Synchroton Radiation Facility [Grenoble] (ESRF), Electrochimie Interfaciale et Procédés (EIP), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanostructures et Rayons X (NRX), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Eindhoven University of Technology [Eindhoven] (TU/e), and European Project: 818823,CARINE

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Mechanics of Materials, Mechanical Engineering, General Materials Science, [CHIM.CATA]Chemical Sciences/Catalysis, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, Condensed Matter Physics
Abstract

International audience; Surface strain is widely employed in gas phase catalysis and electrocatalysis to control the binding energies of adsorbates on active sites. However, in situ or operando strain measurements are experimentally challenging, especially on nanomaterials. Here, we exploit coherent diffraction at the new 4 th generation Extremely Brilliant Source at the European Synchrotron Radiation Facility (ESRF-EBS) to map and quantify strain inside individual Pt catalyst nanoparticles under electrochemical control. 3D nanoresolution strain microscopy together with density functional theory and atomistic simulations show for the first time evidence of heterogeneous and potential-dependent strain distribution between highly-coordinated ({100} and {111} facets) and under-coordinated atoms (edges and corners) as well as evidence of strain propagation from the surface to the bulk of the nanoparticle. These dynamic structural relationships directly inform the design of strain-engineered nanocatalysts for energy storage and conversion applications.

Published
2023
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2. UV emission from MOVPE nanowire LEDs

Author

Durand, Christophe, Grenier, Vincent, Finot, Sylvain, Valera, Lucie, Bougerol, C., Eymery, Joël, Jacopin, Gwenolé, Nanophysique et Semiconducteurs (NPSC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Semi-conducteurs à large bande interdite (NEEL - SC2G), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanophysique et Semiconducteurs (NEEL - NPSC), Modélisation et Exploration des Matériaux (MEM), Nanostructures et Rayons X (NRX), and SPIE

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; The use of nanowires has recently emerged to go further in the development of nitride UV LEDs, especially to improve the efficiency or to make micro-sized UV-sources and flexible LEDs/photodetectors. Our current research interest is focused on the core-shell UV quantum wells grown by industrial MOVPE epitaxy tool. Several types of core-shell quantum wells have been successfully achieved: GaN/InAlN for UV-A, GaN/AlGaN or AlGaN/AlGaN for UV-A and UV-B. When the UV GaN/AlGaN QWs are embedded in a core-shell AlGaN p-n junction, the electroluminescence is demonstrated on single-wire μLEDs in the UV-A and UV-B. The further development of core-shell GaN/AlGaN monolayered system is also shown with demonstration of UV-B emission for single-wire μLEDs.

Published
2023
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3. Coherent diffraction imaging at space-group forbidden reflections

Author

Beutier, Guillaume, Eymery, Joel, Dupraz, Maxime, Richard, Marie-Ingrid, Wartelle, Alexis, Verdier, Marc, de Boissieu, Marc, Collins, Steven, Bellec, Ewen, Favre-Nicolin, Vincent, Leake, Steven, Science et Ingénierie des Matériaux et Procédés (SIMaP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanostructures et Rayons X (NRX), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), CRG & Grands instruments (NEEL - CRG), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), DIAMOND Light source, European Synchroton Radiation Facility [Grenoble] (ESRF), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Diamond Light Source Limited [Didcot, UK], Harwell Science and Innovation Campus [Didcot, UK], and the ESRF for beamtime allocation under project number MI-1377

Subjects
Inorganic Chemistry, Structural Biology, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [CHIM.CRIS]Chemical Sciences/Cristallography, General Materials Science, [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physical and Theoretical Chemistry, Condensed Matter Physics, Biochemistry, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

On one hand, coherent diffraction imaging (CDI) in Bragg geometry has emerged as a unique 3D microscopy ofnanocrystals thanks to 3rd generation synchrotron sources. Away from absorption edges and at space-groupallowed reflections, it provides not only the electronic density but also, encoded in the phase, the atomicdisplacement field with respect to the mean lattice, which in turn reveals crystal strain, defects, and domains.On the other hand, some crystal structures have crystallographic reflections which are forbidden by the space-group symmetry but can nevertheless be observed at a suitable X-ray absorption edge, due to the anisotropy of thetensor of scattering (ATS). They are several orders of magnitude weaker than allowed reflections, but theabsence of Thomson scattering allows the observation of various electronic phenomena related to electronic orders(magnetic, charge, orbital), as well as static and dynamic atomic displacements.The new generation of synchrotron sources, such as the ESRF “Extremely Bright Source”, opens opportunities toperform CDI on such weak reflections. Here we report on the measurement of the (115) forbidden reflection of aGaN nanopillar at the Ga K edge. Sufficient statistics could be obtained in a total accumulation time of~30 minutes for an entire rocking curve to retrieve the phase of the scattering function. Suchmeasurement at high temperatures would provide an image of the inhomogeneity of thermal motion in the crystal,which would be particularly interesting close to surfaces, inversion domain boundaries, and crystal defects. Thisproof-of-principle experiment demonstrates that forbidden reflections are a new opportunity for CDI with the newsynchrotron sources.

Published
2021
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