A5067581767- Graphene research and applications
- Electrical Contact Performance and Analysis
- Adhesion, Friction, and Surface Interactions
- Molecular Junctions and Nanostructures
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Transition Metal Oxide Nanomaterials
- Mechanical stress and fatigue analysis
- Gas Sensing Nanomaterials and Sensors
- Advanced Memory and Neural Computing
- Nanowire Synthesis and Applications
- Silicon Carbide Semiconductor Technologies
- Electron and X-Ray Spectroscopy Techniques
- Tribology and Wear Analysis
- Carbon Nanotubes in Composites
- Fiber-reinforced polymer composites
- Diamond and Carbon-based Materials Research
- Electronic Packaging and Soldering Technologies
- Metal and Thin Film Mechanics
- Graphene and Nanomaterials Applications
- Ga2O3 and related materials
- 2D Materials and Applications
- Lubricants and Their Additives
- GaN-based semiconductor devices and materials
- Neuroscience and Neural Engineering
Sorbonne Université
2012-2024
Centre National de la Recherche Scientifique
2013-2024
Laboratoire de Génie Électrique et Électronique de Paris
2014-2024
Université Paris-Saclay
2002-2024
CentraleSupélec
2016-2024
Peking University
2021
Intel (United States)
2021
Rockwell Automation (Switzerland)
2021
California University of Pennsylvania
2021
Massachusetts Institute of Technology
2021
The chemistry of aryldiazonium salts has been thoroughly used in recent years to graft a very simple and robust way ultrathin polyphenylene-like films on broad range surfaces. We show here that the same can be obtain "self-adhesive surfaces". This target was reached by coating various surfaces with chemisorbed organic containing active salts. These surfaces" are then put into contact species (molecules, polymers, nanoparticles, nanotubes, graphene flakes, etc.) react either spontaneously or...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. Abid, T. Moudakir, G. Orsal, S. Gautier, A. En Naciri, Z. Djebbour, J.-H. Ryou, Patriarche, L. Largeau, H. J. Kim, Lochner, K. Pantzas, D. Alamarguy, F. Jomard, R. Dupuis, J.-P. Salvestrini, P. Voss, Ougazzaden; Distributed Bragg reflectors based on diluted boron-based BAlN alloys for deep ultraviolet...
The phenomenon of resistive switching (RS), which was initially linked to non-volatile memory applications, has recently also been associated with the concept memristors, whose adjustable multilevel resistance characteristics open up unforeseen perspectives in cognitive computing. Herein, we demonstrate that states LixCoO2 thin film-based metal-insulator-metal (MIM) solid-state cells can be tuned by sequential programming voltage pulses and these are dramatically dependent on input rate,...
Large-area graphene film doped with nitrogen is of great interest for a wide spectrum nanoelectronics applications, such as field effect devices, super capacitors, and fuel cells among many others. Here, we report on the structural electronic properties trilayer 4H-SiC (0001) grown under atmospheric pressure. The nature growth evidenced by scanning transmission electron microscopy. X-ray photoelectron spectroscopy shows incorporation 1.2% distributed in pyrrolic-N, pyridinic-N configurations...
The study of new materials for transparent electrodes or heterojunctions made 2D combinations is a very active research topic. Challenges to overcome are the modulation optoelectronic properties such achieve competitive photovoltaic devices. In this work, graphene oxide was reduced into through different chemical (hydrazine, ultraviolet photocatalysis) and biological (microorganisms) processes. W e benchmarked reduction efficiency by probing characteristics using various physical...
Abstract Lithium cobalt oxide nanobatteries offer exciting prospects in the field of nonvolatile memories and neuromorphic circuits. However, precise underlying resistive switching (RS) mechanism remains a matter debate two‐terminal cells. Herein, intriguing results, obtained by secondary ion mass spectroscopy (SIMS) 3D imaging, clearly demonstrate that RS corresponds to lithium migration toward outside Li x CoO 2 layer. These observations are very well correlated with observed...
Chemical doping of graphene is a key process for the modulation its electronic properties and design fabrication based nanoelectronic devices.Here, we study adsorption diluted concentrations nitric acid (HNO 3 ) onto monolayer graphene/4H-SiC (0001) to induce variation work function (WF).Raman spectroscopy indicates an increase in defect density subsequent doping.Moreover, ultraviolet photoemission (UPS) was utilized quantify WF shift.UPS data show that layer decreased from 4.3 eV (pristine)...
Field emission current from surfaces under vacuum and at high field strengths can be reduced by the injection of gas into evacuated volume. In this paper, effects ${\mathrm{H}}_{2}$, He, ${\mathrm{N}}_{2}$, Ar on ``dark'' emitted a tungsten carbide point cathode for 2 cm gap distance is studied. Exposure to any these gases pressures order ${10}^{\ensuremath{-}3}--{10}^{\ensuremath{-}2}\text{ }\mathrm{Pa}$ was found reduce up 90% with time constant $\ensuremath{\sim}1\text{ }\text{...
Abstract Because of their intrinsic polarization and related properties, ferroelectrics attract significant attention to address energy transformation environmental protection. Here, by using trivalent‐ion‐lanthanum doping BiFeO 3 nanoparticles (NPs), it is shown that defects piezoelectric potential are synergized achieve a high piezocatalytic effect for decomposing the model Rhodamine B (RhB) pollutant, reaching record‐high rate 21 360 L mol −1 min (i.e., 100% RhB degradation within 20 min)...
Electrical contacts are an essential part of electrical circuits and many reliability problems related to their failure. The present work uses numerical simulation in view a better analysis the electromechanical phenomena, case multilayer contacts. We study ball/plane contact made bulk CuZn alloy, protected by thin Sn surface layer. A coupled finite element is performed calculate resistance device: elasto-plastic model used determine geometry area, then gives resulting constriction...
Oxidizable metals such as tin, copper and nickel are largely used to manufacture connectors or electrical contacts. They have been shown be particularly prone fretting degradation. In a recent investigation we that coatings electrodeposited in different conditions could display behaviors. The characterization of the showed influence two main parameters: grain size surface composition. this paper present an extensive study wear tracks performed by XPS AES. Then mechanical behaviors...
Fretting remains a major cause of connector failure and can impair reliability in complex systems. Oxidizable metals such as tin, copper nickel are particularly prone to fretting degradation. We report here the first results an investigation on contacts with two types deposits. Sulfate layers electrodeposited different conditions show very behaviours during tests. The characteristics analyzed compositions microstructures. measured by X-Ray Photoelectron Spectroscopy (XPS) which allows...
Due to its electrical and optical interesting properties, InGaN alloy is being intensively studied be combined with silicon in order achieve low-cost high-efficiency solar cell. However, a relatively thick monophasic layer of difficult grow due the relaxation issue material. This can avoided by semibulk structure. In this work, we present an InGaN/Si double-junction cell modeled using Silvaco-ATLAS TCAD software. We have taken into account polarization effect III-N materials. shown that 50%...
Hexagonal boron nitride (hBN) has become a prominent material for nanophotonic and quantum technology studies. Its wide bandgap can accommodate room temperature radiative optical transitions originating from defect states in different atomic structures. Here, we report the engineering of visible defects chemical vapor deposited monolayer hBN irradiated by femtosecond pulses (0.1–0.5 W) at temperature. Photoluminescence transient photoluminescence measurements reveal presence sharp emission...
Abstract The distribution of Li in the V 2 O 5 films was determined before and after intercalation/deintercalation electrochemical cycles by time flight secondary ion mass spectroscopy (ToF‐SIMS) depth profiling. On deintercalation most inserted is removed except vicinity interface with fluorine‐substituted tin oxide, used as a conducting substrate. More surprisingly, also found region part film that has not been immersed electrolyte had thus electrochemically controlled. This finding...
We studied interface effects of thin film V2O5 electrodes on top indium tin oxide (ITO) glass for Li intercalation by means a combination methods: depth-profiling secondary ion mass spectroscopy (SIMS), electrochemical insertion-extraction lithium ions slow-scan cyclic voltammetry (SSCV) and potentiostatic intermittent titration technique (PITT). show that the Li+ distribution inside is always far from homogeneous, different diffusion paths (parallel to interfaces as well perpendicular them)...
Fretting is a well known phenomena due to unwanted micro displacements leading drastic electrical contact resistance increase. Much work has been done understand and evaluate the critical parameters in view of finding solutions alleviate problem. Several paths have proposed involving for example connector design surface modification. The simplest modification process depositing an organic thin film with specific properties. effect liquid lubricants on fretting contacts studied lubrication...
Abstract Thin sol–gel V 2 O 5 films were examined before and after lithium electrochemical intercalation/de‐intercalation cycles. X‐ray photoelectron spectroscopy (XPS) was used for surface characterisation, while microstructure morphological characteristics studied by atomic force electron microscopies (AFM, SEM TEM). Microscopy showed the film, as prepared, to be highly crystalline, having a layered structure good stoichiometry few impurities. Electrochemical cycling rinsing analysis...