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Your search keyword '"Loir, Anne-Sophie"' showing total 18 results
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18 results on '"Loir, Anne-Sophie"'

7. Elaboration de nouvelles microcellules BDD micro-usinées pour la détermination des métaux lourds

Author

Sbartai, Amel, primary, Namour, Philipe, additional, Errachid, Abdelhamid, additional, Krejči, Jan, additional, Renaud, L., additional, Hamlaoui, Mohamed Larbi, additional, Loir, Anne-Sophie, additional, Garrelie, F., additional, Donnet, C., additional, Soder, H., additional, Audouard, E., additional, Granier, J., additional, and Jaffrezic-Renault, Nicole, additional

Published
2020
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11. Towards Room Temperature Phase Transition of W-Doped VO 2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis.

Author

Bleu, Yannick, Bourquard, Florent, Barnier, Vincent, Loir, Anne-Sophie, Garrelie, Florence, and Donnet, Christophe

Subjects
PHASE transitions, PULSED laser deposition, ELECTROCHROMIC effect, THIN films, THERMOCHROMISM, TRANSITION temperature, RAPID thermal processing, SURFACE chemistry
Abstract

Vanadium dioxide (VO2) with an insulator-to-metal (IMT) transition (∼68 °C) is considered a very attractive thermochromic material for smart window applications. Indeed, tailoring and understanding the thermochromic and surface properties at lower temperatures can enable room-temperature applications. The effect of W doping on the thermochromic, surface, and nanostructure properties of VO2 thin film was investigated in the present proof. W-doped VO2 thin films with different W contents were deposited by pulsed laser deposition (PLD) using V/W (+O2) and V2O5/W multilayers. Rapid thermal annealing at 400–450 °C under oxygen flow was performed to crystallize the as-deposited films. The thermochromic, surface chemistry, structural, and morphological properties of the thin films obtained were investigated. The results showed that the V5+ was more surface sensitive and W distribution was homogeneous in all samples. Moreover, the V2O5 acted as a W diffusion barrier during the annealing stage, whereas the V+O2 environment favored W surface diffusion. The phase transition temperature gradually decreased with increasing W content with a high efficiency of −26 °C per at. % W. For the highest doping concentration of 1.7 at. %, VO2 showed room-temperature transition (26 °C) with high luminous transmittance (62%), indicating great potential for optical applications. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Electroanalytical Performance of Nitrogen-Doped Graphene Films Processed in One Step by Pulsed Laser Deposition Directly Coupled with Thermal Annealing

Author

Consejo Superior de Investigaciones Científicas (España), Université de Lyon, Agence Nationale de la Recherche (France), Bourquard, Florent, Bleu, Yannick, Loir, Anne-Sophie, Caja-Munoz, Borja, Ávila, José, Asensio, María C., Raimondi, Gaëtan, Shokouhi, Maryam, Rassas, Ilhem, Farre, Carole, Chaix, Carole, Barnier, Vincent, Jaffrezic-Renault, Nicole, Garrelie, Florence, Donnet, Christophe, Consejo Superior de Investigaciones Científicas (España), Université de Lyon, Agence Nationale de la Recherche (France), Bourquard, Florent, Bleu, Yannick, Loir, Anne-Sophie, Caja-Munoz, Borja, Ávila, José, Asensio, María C., Raimondi, Gaëtan, Shokouhi, Maryam, Rassas, Ilhem, Farre, Carole, Chaix, Carole, Barnier, Vincent, Jaffrezic-Renault, Nicole, Garrelie, Florence, and Donnet, Christophe

Abstract

Graphene-based materials are widely studied to enable significant improvements in electroanalytical devices requiring new generations of robust, sensitive and low-cost electrodes. In this paper, we present a direct one-step route to synthetize a functional nitrogen-doped graphene film onto a Ni-covered silicon electrode substrate heated at high temperature, by pulsed laser deposition of carbon in the presence of a surrounding nitrogen atmosphere, with no post-deposition transfer of the film. With the ferrocene methanol system, the functionalized electrode exhibits excellent reversibility, close to the theoretical value of 59 mV, and very high sensitivity to hydrogen peroxide oxidation. Our electroanalytical results were correlated with the composition and nanoarchitecture of the N-doped graphene film containing 1.75 at % of nitrogen and identified as a few-layer defected and textured graphene film containing a balanced mixture of graphitic-N and pyrrolic-N chemical functions. The absence of nitrogen dopant in the graphene film considerably degraded some electroanalytical performances. Heat treatment extended beyond the high temperature graphene synthesis did not significantly improve any of the performances. This work contributes to a better understanding of the electrochemical mechanisms of doped graphene-based electrodes obtained by a direct and controlled synthesis process.

Published
2019

13. Electrochemical properties of nitrogen-doped graphene for environmental sensors

Author

Bourquard, Florent, Bleu, Yannick, Barnier, Vincent, Loir, Anne-Sophie, Chaix, Carole, Raimondi, Gaëtan, Lagarde, Florence, Jaffrezic-Renault, Nicole, Garrelie, Florence, Donnet, Christophe, Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Laboratoire Georges Friedel (LGF-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Interfaces & biosensors - Interfaces & biocapteurs, Institut des Sciences Analytiques (ISA), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), and PEPS Université de Lyon - CNRS

Subjects
[PHYS]Physics [physics], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract

International audience; A promising way to tailor the chemical and electronic properties of graphene layers is the doping of the carbon honeycomb using heteroatoms such as nitrogen or boron. In the domain of electrochemical sensor, this may allow to control both conductivity and chemical activity. Nitrogen doped graphene was produced by the thermal annealing of nitrogen doped amorphous carbon (a-C:N) deposited either on a nickel thin film on a silicon substrate or between the silicon substrate and the nickel catalyst layer. The a-C:N thin films were produced by femtosecond pulsed laser ablation of graphite in nitrogen, while the nickel thin film was thermally evaporated. The nitrogen content and bonding configuration in the produced films were evaluated by XPS spectroscopy, with a particular attention to the ratio of pyridinic and pyrrolic bondings, the former being more interesting to control the conductivity and chemical activity of the film. The structure of the graphene was studied through microRaman spectroscopy using Raman mapping. Those results were compared to the electrochemical properties of the produced N-doped graphene films, studied through cyclic voltammetry using ferrocene as a redox probe. Electron transfer properties are compared to non-doped graphene films, which have already shown promising electrografting perspectives for advanced compound detection (1).(1) P. Fortgang et al., ACS Applied Materials and Interfaces 8 (2016) 1424-1433

Published
2018

15. Electroanalytical Performance of Nitrogen-Doped Graphene Films Processed in One Step by Pulsed Laser Deposition Directly Coupled with Thermal Annealing

Author

Bourquard, Florent, primary, Bleu, Yannick, additional, Loir, Anne-Sophie, additional, Caja-Munoz, Borja, additional, Avila, José, additional, Asensio, Maria-Carmen, additional, Raimondi, Gaëtan, additional, Shokouhi, Maryam, additional, Rassas, Ilhem, additional, Farre, Carole, additional, Chaix, Carole, additional, Barnier, Vincent, additional, Jaffrezic-Renault, Nicole, additional, Garrelie, Florence, additional, and Donnet, Christophe, additional

Published
2019
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18. Robust Electrografting on Self-Organized 3D Graphene Electrodes

Author

Fortgang, Philippe, primary, Tite, Teddy, additional, Barnier, Vincent, additional, Zehani, Nedjla, additional, Maddi, Chiranjeevi, additional, Lagarde, Florence, additional, Loir, Anne-Sophie, additional, Jaffrezic-Renault, Nicole, additional, Donnet, Christophe, additional, Garrelie, Florence, additional, and Chaix, Carole, additional

Published
2016
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