A5042823922- Copper-based nanomaterials and applications
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Diamond and Carbon-based Materials Research
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Carbon Nanotubes in Composites
- Metal and Thin Film Mechanics
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Semiconductor materials and interfaces
- X-ray Diffraction in Crystallography
- TiO2 Photocatalysis and Solar Cells
- Catalytic Processes in Materials Science
- GaN-based semiconductor devices and materials
- Crystallization and Solubility Studies
- Advanced Condensed Matter Physics
- Advanced Battery Materials and Technologies
- Nuclear materials and radiation effects
- Catalysis and Oxidation Reactions
- Conducting polymers and applications
- Advanced Photocatalysis Techniques
- Transition Metal Oxide Nanomaterials
- Electronic and Structural Properties of Oxides
- Ion-surface interactions and analysis
Institut des Matériaux Jean Rouxel
2016-2025
Nantes Université
2016-2025
Centre National de la Recherche Scientifique
2016-2025
École Nationale Supérieure des Mines de Paris
2010
Laboratoire de Physique Subatomique et des Technologies Associées
2010
Institut de Chimie
2008
Institut de Chimie de la Matière Condensée de Bordeaux
2008
Université de Poitiers
2003-2005
Catalyse
2004-2005
The bulk synthesis of freestanding carbon nanotube (CNT) frameworks is developed through a sulfur-addition strategy during an ambient-pressure chemical vapour deposition process, with ferrocene used as the catalyst precursor. This approach enhances CNTs' length and contorted morphology, which are key features leading to formation synthesized porous networks. We demonstrate that such three-dimensional structure selectively uptakes from water mass toxic organic solvent (i.e. o-dichlorobenzene)...
Composite core-shell nanoparticles may have morpho-structural, magnetic, and optical (photoluminescence (PL)) properties different from each of the components considered separately. The Fe3O4–TiO2 can be controlled by adjusting titania amount (shell thinness). Core–shell were prepared seed mediated growth semiconductor (TiO2) through a modified sol-gel process onto preformed magnetite (Fe3O4) cores resulted co-precipitation method. structure morphology samples characterized X-ray...
Abstract The relationship between thermal conductivity and microstructures of aluminium nitride films is reported. Films were deposited on silicon substrates by magnetron sputtering a pure Al target in nitrogen argon plasma at low temperatures (<300 °C) with thickness ranging from 150 to 3500 nm. Balanced unbalanced configurations used for different contents the gas phase. Various thus created their was measured transient hot strip technique. Depending crystalline structure films, bulk...
We report herein on the origin of black color NiO, widespread p-type semiconductor used as photocathode in dye-sensitized solar cells (DSSCs). Clearly, presence nickel metal (Ni0) was revealed by X-ray diffraction analyses and photoelectron spectroscopy all NiO samples we have prepared according to chemical routes usually employed for DSSC applications. Thus, cathodes is correlated existence Ni0 not increased amount Ni2+/Ni3+ mixed valence commonly suggested literature. Surprisingly,...
Understanding the dealloying mechanisms of gold-based alloy thin films resulting in formation nanoporous gold with a sponge-like structure is essential for future design and integration this novel class material practical devices. Here we report on synthesis using free-corrosion approach nitric acid applied to cosputtered Au–Cu films. A relationship established between as-grown film characteristics (i.e., composition, morphology, structure) porosity We further demonstrate that can be...
Titanium dioxide (TiO2) is a transition metal oxide widely used as white pigment in various applications, including food. Due to the classification of TiO2 nanoparticles by International Agency for Research on Cancer potentially harmful humans inhalation, presence food products needed be confirmed set independent studies. Seven samples food-grade (E171) were extensively characterised their size distribution, crystallinity and surface properties currently recommended methods. All investigated...
Delafossite CuGaO2 is a prototype p-type transparent semiconducting oxide. We report here new ethylene glycol (EG) mediated hydrothermal synthesis route to this material from soluble hydrated metal nitrates. found that EG acts as reducing agent which eases the formation of by stabilizing Cu(I) at low temperature in conditions. Moreover, we observed initial pH precursors solution key parameter tune particle sizes (from 2 µm 300 nm) and subsequently color dark brown light gray) powder. The...
Hollow bimetallic nanostructures are of great importance for various applications. Understanding the fundamental mechanisms occurring during synthesis such nanomaterials by wet chemistry remains very challenging. This Article reports a mechanistic study on galvanic replacement reaction between planar arrays silver nanowires grown site-specifically tall silicon nanogratings and HAuCl4 in lack any stabilizing or capping agent, which might complicate alter conversion process into silver–gold...
Three different morphologies of CuO nanomaterials were used to prepare photocathodes for p-type dye-sensitized solar cells (p-DSSCs) with P1, <bold>DPP-NDI</bold> and <bold>YF1</bold> as dyes, I<sup>−</sup>/I3<sup>−</sup> Co<sup>III</sup>/Co<sup>II</sup> redox mediators.
In this study, a model AgNbO3 perovskite is prepared via polyacrylamide synthesis technique, and the underlying unique Li+storage mechanism studied. This structure projected to provide low Li+ storage capacity due all occupied crystallographic sites. It delivered specific of 17 mAh.g−1 at 0.1A.g−1 within potential range 1.2–3.0 V vs. Li+/Li. However, lower potentials, material undergoes activation for by multistep structural transition that included in-situ Ag-exsolution from A-site lattice...
We report a general and simple approach to take control of the color light-emitting two-luminophore hybrid nanowires (NWs). Our strategy is based on spatial at nanoscale (coaxial geometry) spectral selection two kinds luminophores in order restrict complex charge energy transfers. Thus, it possible photoluminescence (PL) as an interpolation CIE (Commission Internationale de l'Eclairage) coordinates each luminophore. For this purpose, we selected green-emitting semiconducting polymer...
p-Type dye solar cells (p-DSSCs) have been receiving much attention due to their potential role in the elaboration of future tandem with a photoanode and photocathode built upon n-type p-type semiconductors, respectively. So far, NiO appears as most widely used semiconductor p-DSSCs. Yet this material suffers from several drawbacks, e.g., low electrical conductivity redox that limit photovoltaic performances. In framework, delafossite compounds may be regarded appropriate substitutes nickel...
Copper borate as a photocathode in p-type dye-sensitized solar cells.
Nanoporous materials are of great importance for a broad range applications including catalysis, optical sensors and water filtration. Although several approaches already exist the creation nanoporous materials, race development versatile methods, more suitable nanoelectronics industry, is still ongoing. In this communication we report first time on possibility generating nanoporosity in silver nanocolumns using dry approach based oxidation by direct exposure to commercially available...
Titanium dioxide is a metal oxide used as white pigment in many food categories, including confectionery. Due to differences the mass fraction of nanoparticles contained TiO2, estimated intakes TiO2 differ by factor 10 literature. To resolve this problem, better estimation present products needed. In study, we focused our efforts on chewing gum, which one contributing most intake TiO2. The coatings four kinds where presence was confirmed Raman spectroscopy, were extracted aqueous phases....
This study compares the charging mechanisms, thermodynamics, lithium ion transport, and operando isothermal calorimetry in lithium-ion battery electrodes made of Ti2Nb2O9 microparticles or nanoparticles synthesized by solid-state sol-gel methods, respectively. First, electrochemical testing showed that exhibited larger specific capacity, smaller polarization, better capacity retention at large currents than those microparticles. Furthermore, potentiometric entropy measurements revealed...
The interest for pure sulfide Cu(In,Ga)S 2 chalcopyrite thin films is increasing again because their optical properties make them relevant candidates to be applied as top cell absorbers in tandem structures. Nonetheless, use so still hindered by the level of single-junction cells performance achieved far, which are far below those demonstrated selenide absorbers. Amongst reasons at origin limited efficiency -based solar devices, one can mention poor tolerance S-chalcopyrite Cu deficiency. In...