A5020085242- Graphene research and applications
- Fusion materials and technologies
- Nuclear Materials and Properties
- Molecular Junctions and Nanostructures
- Surface and Thin Film Phenomena
- Advanced Chemical Physics Studies
- Topological Materials and Phenomena
- Semiconductor materials and devices
- Surface Chemistry and Catalysis
- 2D Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Semiconductor materials and interfaces
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Thin-Film Transistor Technologies
- Quantum and electron transport phenomena
- Silicon Nanostructures and Photoluminescence
- Plasma Diagnostics and Applications
- Advanced Materials Characterization Techniques
- Atomic and Molecular Physics
- Nanowire Synthesis and Applications
- Magnetic confinement fusion research
- Physics of Superconductivity and Magnetism
Centre National de la Recherche Scientifique
2014-2024
Aix-Marseille Université
2014-2024
Physique des interactions ioniques et moléculaires
2015-2024
Plasma (Russia)
2015
KTH Royal Institute of Technology
2008
Uppsala University
2008
Laboratoire de Photochimie et d'Ingénierie Macromoléculaire
1995-2000
University of Missouri
1992-1999
Université de Haute-Alsace
1997-1998
Institut de Sciences des Matériaux de Mulhouse
1997
Thick epitaxial multilayer silicene films with a √3 × √3R(30°) surface structure show only mild oxidation after 24 h in air, as measured by Auger electron spectroscopy. X-ray diffraction and Raman spectroscopy measurements performed air without any protective capping, well as, for comparison, thin Al2O3 cap, showed the (002) reflection G, D 2D structures, which are unique fingerprints of thick silicene.
The provision of a particle and power exhaust solution which is compatible with first-wall components edge-plasma conditions key area present-day fusion research mandatory for successful operation ITER DEMO. work package plasma-facing (WP PFC) within the European programme complements laboratory experiments, i.e. in linear plasma devices, electron ion beam loading facilities, studies performed toroidally confined magnetic such as JET, ASDEX Upgrade, WEST etc. connection both groups done via...
The electronic structure of cobalt-phthalocyanine (CoPc) molecules adsorbed on Ag(100) is investigated by photoemission spectroscopy. results are compared to first-principles calculations, based many-body perturbation theory in the GW approximation. data, obtained from both multilayer and monolayer films CoPc, show that charge transfer occurs between first molecular layer metal surface. Varying photon energy, tune photoionization cross sections, reveals charge-transfer-related interface...
At monolayer coverage, silicene on Ag(1 1 1) may present different structural phases depending the growth conditions. multilayer only one phase has been reported: phase. However, no link between arrangement of and that addressed. In this paper, reporting experimental work based low-energy electron diffraction scanning tunneling microscopy, we focus aspects a film silicene. We demonstrate it exhibits arrangement, namely form, but with domain orientations resulting from properties initial...
One year after the publication of seminal paper on monolayer 3 × reconstructed silicene grown a silver (111) substrate, evidence synthesis epitaxial √3 multilayer hosting Dirac fermions was presented. Although general consensus immediately reached in former case, latter, mere existence questioned and strongly debated. Here, we demonstrate by means comprehensive x-ray crystallographic study that is effectively realized upon growth at rather low temperatures (∼200 °C), while three-dimensional...
The interaction of H atoms having relatively low average kinetic energy (∼0.025 eV) with both perfectly clean and D-covered HOPG surfaces is investigated using high resolution electron loss spectroscopy. From this study we confirm, in a controlled fashion, the presence theoretically predicted adsorption barrier since no detected for such on HOPG. Moreover, demonstrate that exposure D saturated surface to these results complete removal adatoms, further despite prediction vanish dimers para...
Density Functional Theory studies show that in tungsten a mono vacancy can contain up to 6 Hydrogen Isotopes (HIs) at 300K with detrapping energies varying the number of HIs vacancy.Using these predictions, multi trapping rate equation model has been built and used thermal desorption spectrometry (TDS) experiments performed on single crystal after deuterium ions implantation.Detrapping obtained from adjust temperature TDS spectrum observed experimentally are good agreement DFT values within...
Fusion fuel retention (trapping) and release (desorption) from plasma-facing components are critical issues for ITER any future industrial demonstration reactors such as DEMO. Therefore, understanding the fundamental mechanisms behind of hydrogen isotopes in first wall divertor materials is necessary. We developed an approach that couples dedicated experimental studies with modelling at all relevant scales, microscopic elementary steps to macroscopic observables, order build a reliable...
Abstract Surface and near-surface morphology evolution of helium-irradiated tungsten due to thermal cycling up the ITER-relevant temperature 1350 K was studied using electron microscopy positron annihilation spectroscopy techniques. Holes at surface bubbles in recrystallized polycrystalline samples were created by 75 eV helium plasma irradiation with fluence 3 × 10 23 He m −2 1073 K. Subsequent annealing experiments combined a detailed analysis investigate shape density changes holes respect...
Abstract We performed a direct comparison of deuterium retention and release from tungsten in presence or absence oxygen impurities. A single crystal W(110) was used to prepare with four different surface states: its native oxide, atomically clean, covered half monolayer atoms, three fourths atoms. For D ion fluence 3 × 10 21 + m −2 implanted at 300 K, highest the lowest atoms intermediate for clean surface. This counterintuitive result is explained by localization these samples. occurs...
The adsorption of H/D atoms on the graphite (0001) surface is investigated by means both high-resolution electron-energy loss spectroscopy (HREELS) and periodic first-principle density-functional theory. two methods converge towards modes adsorption: in clusters about four hydrogen pairs contiguous carbon sites. desorption energies estimated from calculated dissociation range 8 to 185 kJ mol(-1) leading an coverage at saturations 30-44 at. %. These results are compared with previous thermal...
Phthalocyanines (Pcs) are capable of converting sunlight into electric energy when adsorbed on TiO2 in a dye-sensitized solar cell. Of special interest this type cell is the level alignment as well how molecules adsorb surface it determines output We investigated FePc−TiO2(110) interface using scanning tunneling microscopy, synchrotron-based photoelectron spectroscopy, and X-ray absorption spectroscopy. found strong coupling first-layer FePc to substrate resulting an alteration electronic...
The geometrical, electronic, and vibrational properties of one monolayer Zinc-phthalocyanine (ZnPc) adsorbed on Ag(110) are studied by low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), high-resolution energy-loss spectroscopy (HREELS). STM LEED revealed that the molecules lie flat surface, ordered in a compact arrangement with supercell defining coincidence mesh substrate lattice. By comparing HREELS spectra to those multilayer film, which weakly interacting, it...
An experimental investigation of the epitaxial growth iron-phthalocyanines on Ag(111) has been conducted in monolayer range by low-energy electron diffraction and scanning tunneling microscopy. During growth, molecular overlayer undergoes few structural phase transitions, various superlattices with oblique or rectangular unit cells have identified. We show that morphologies most stable superstructures formed for different coverage are adopted phthalocyanines central metal atom phthalocyanine...
Adsorption of organic molecules on well-oriented single crystal coinage metal surfaces fundamentally affects the energy distribution curve ultra-violet photoelectron spectroscopy spectra. New features not present in spectrum pristine can be assigned as "interface states" having some degree molecule-substrate hybridization. Here it is shown that interface states molecular orbital character easily identified at low binding isolated above featureless substrate sp-plateau. On other hand much...
Abstract In the blooming field of on-surface synthesis, molecular building blocks are designed to self-assemble and covalently couple directly on a well-defined surface, thus allowing exploration unusual reaction pathways production specific compounds in mild conditions. Here we report creation functionalized organic nanoribbons Ag(110) surface. C–H bond activation homo-coupling precursors is achieved upon thermal activation. The anisotropic substrate acts as an efficient template fostering...
Hydrogen functionalization of graphene by exposure to vibrationally excited H2 molecules is investigated combined scanning tunneling microscopy, high-resolution electron energy loss spectroscopy, X-ray photoelectron spectroscopy measurements, and density functional theory calculations. The measurements reveal that dissociatively adsorb on Ir(111) resulting in nanopatterned hydrogen structures. Calculations demonstrate the presence Ir surface below lowers dissociative adsorption barrier...
The impact of helium (He) plasma exposure with He fluxes relevant for ITER and WEST on the near-surface microstructure polycrystalline tungsten (W) is investigated by coupling transmission electron microscopy (TEM) analysis thermal desorption spectrometry (TDS) measurements. samples were exposed in PSI-2 linear device to 75 eV ions up fluence 3 × 1023 m−2 surface temperature range 1053–1073 K. obtained bubbles–enriched W are subsequently probed sequences low flux 250 deuterium (D) ion...
Abstract Rate equation modelling is performed to simulate <?CDATA ${\mathrm{D_2}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi mathvariant="normal">D</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> and ${\mathrm{D_2}}+{\mathrm{D}_2^+}$?> <mml:mo>+</mml:mo> <mml:msubsup> </mml:msubsup> exposure of the ${\mathrm{W}(110)}$?> mathvariant="normal">W</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mn>110</mml:mn>...