A5086195852- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Electron and X-Ray Spectroscopy Techniques
- ZnO doping and properties
- Magnetic Properties and Synthesis of Ferrites
- Metal and Thin Film Mechanics
- Catalysis and Oxidation Reactions
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Iron oxide chemistry and applications
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
- Diamond and Carbon-based Materials Research
- Advanced Chemical Physics Studies
- TiO2 Photocatalysis and Solar Cells
- Electrocatalysts for Energy Conversion
- Block Copolymer Self-Assembly
- Quantum Dots Synthesis And Properties
- Advanced Polymer Synthesis and Characterization
- Molecular Junctions and Nanostructures
- Advanced materials and composites
- Multiferroics and related materials
- Copper Interconnects and Reliability
- Ferroelectric and Piezoelectric Materials
Laboratoire Interdisciplinaire Carnot de Bourgogne
2016-2025
Université de Bourgogne
2015-2025
Centre National de la Recherche Scientifique
2015-2024
Université Bourgogne Franche-Comté
2019-2022
Fédération de Recherche Spectroscopies de Photoémission
2021
Maison des Sciences de l’Homme de Dijon
2014-2019
Automation and Process Engineering Laboratory
2016
École d'Ingénieurs en Chimie et Sciences du Numérique
2016
Laboratoire de Réactivité et Chimie des Solides
1998-2007
University of Padua
2003
The charge distribution of the defect states at reduced TiO(2)(110) surface is studied via a new method, resonant photoelectron diffraction. diffraction pattern from state, excited Ti-2p-3d resonance, analyzed in forward scattering approach and on basis multiple calculations. found to be shared by several subsurface Ti sites with dominant contribution specific site agreement density functional theory
The gap state that appears upon reduction of TiO2 plays a key role in many titania's interesting properties but its origin and spatial localization have remained unclear. In the present work, TiO2(110) surface is reduced chemically controlled way by sodium adsorption. By means resonant photoelectron diffraction, excess electrons are shown to be distributed mainly on subsurface Ti sites strikingly similar defective surface, while any significant contribution from interstitial ions discarded....
In this work, we determine the electronic structure and charge carrier dynamics of α-Fe2O3(0001) ultrathin film deposited on Pt(111) as a function water pressure by combined near ambient pressure–time-resolved photoelectron spectroscopy (NAP-TR-PES) measurements DFT calculations. Under ultrahigh vacuum (UHV) α-Fe2O3 exhibits expected typical n-type semiconductor behavior with surface photovoltage (SPV) shift 31 meV. Surprisingly, when exposed to completely different comportment appears. At...
Abstract A novel approach for the bottom‐up construction of hybrid organic–inorganic nanocomposites with an intimate arrangement between sp 3 ‐carbon 3D molecular‐size nanodiamonds (diamondoids) and a coated palladium surface as nanolayer is reported. The process conducted stepwisely from gas phase, using first controlled vapor‐phase self‐assembly tailor‐made functionalized diamantane derivatives, followed by low‐temperature (45 °C) chemical vapor deposition organometallic complex in...
Abstract Diamondoids, sp 3 ‐hybridized nanometer‐sized diamond‐like hydrocarbons (nanodiamonds), difunctionalized with hydroxy and primary phosphine oxide groups, enable the assembly of first ‐C‐based chemical sensors by vapor deposition. Both pristine nanodiamonds palladium nanolayered composites can be used to detect toxic NO 2 NH gases. This carbon‐based gas sensor technology allows reversible detection down 50 ppb at 25–100 ppm concentration fast response recovery processes 100 °C....
Abstract Thin films of TiN x O y were deposited by d.c. magnetron sputtering on glass substrates using an (Ar + ,N 2 ) plasma and Ti target. The N partial pressure was changed from 2.3 × 10 −4 mbar to 4.6 −3 in order obtain with increasing nitrogen contents. X‐ray photoelectron spectroscopy used determine the as‐deposited composition. presence oxygen, which is probably due contamination residual atmosphere vacuum chamber, always detected, both surface layers bulk films, confirming formation...
We detail herein readily accessible processes to control previously unobserved robust self-assemblies of nanodiamonds (diamondoids) in micro- and nanocrystals from their mild vapor deposition. The chemical functionalization uniform discernible was found be a key parameter, depending on the type functional group (hydroxy, fluorine, etc.) its position diamondoid, structure discrete deposits can vary dramatically. Thus, well-defined anisotropic structures such as rod, needle, triangle or...
The self-assembly technique provides a highly efficient route to generate well-ordered structures on nanometer scale. In this paper, arrays of PdAg alloy nanoparticles flat substrates with narrow distributions particle size (6-7 nm) and interparticle spacing (about 60 were synthesized by the block copolymer micelle approach. A home-made PS-b-P4VP diblock was prepared obtain micellar structure in toluene. Pd Ag salts then successfully loaded core copolymer. self-assembled monolayer micelles...
Nanocrystalline tungsten oxide (WO3) thin films synthesized by thermal oxidation of substrates were exposed to low energy helium ions (energy: 80 eV; flux: 1.4–1.7 × 1020 m−2 s−1) at room temperature and 673 K. The structure morphology changes the studied using Raman spectroscopy electron microscopy. Due ion energy, no erosion is observed temperature. In contrast, K, a color change significant measured (∼70 nm for fluence ∼4 1021 m−2) due synergetic effect between bombardment heating. We...
This work presents new microwave-based sensing measurements for the detection of NH3 using metal-oxide sensitive layers, namely titanium dioxide nanoparticles (P25 Degussa). Several designs have been tested to assess influence design on microwave gas response. The results microstrip interdigital capacitor, rectangular spiral antenna and resonator are presented over a wide range frequencies (2-8GHz). All were firstly optimized by numerical simulation, then experimentally in presence ammonia...
Titanium oxynitride (TiNxOy) thin films were deposited by low-pressure metal–organic CVD (LP-MOCVD) on (100) silicon, sapphire, and polycrystalline alumina substrates. isopropoxide (TIP) ammonia used as precursors. The influence of the growth temperature, ranking from 450 °C to 750 °C, was investigated scanning electron microscopy (SEM), electrical DC measurements. Rutherford back-scattering (RBS) measurements determine N/O ratio in films. surface observations showed two morphological...
We studied the growth of epitaxial ferroelectric layers BaTiO3/Pt(001) in framework solar water splitting. The stoichiometry, that is, Ti/Ba ratio, appears as a crucial parameter not only for crystallographic structure but also photocurrent generation when sample is used photoanode. established an electrochemical poling method using modulated potential, without altering to control electric polarization. Importantly, we show photoanode efficiency improved polarization film oriented toward...