A5074538226- Graphene research and applications
- Molecular Junctions and Nanostructures
- Topological Materials and Phenomena
- 2D Materials and Applications
- Surface and Thin Film Phenomena
- Surface Chemistry and Catalysis
- Porphyrin and Phthalocyanine Chemistry
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor materials and interfaces
- Quantum and electron transport phenomena
- Advanced Chemical Physics Studies
- Fusion materials and technologies
- Synthesis and Properties of Aromatic Compounds
- Electrochemical Analysis and Applications
- Advanced Semiconductor Detectors and Materials
- Ion-surface interactions and analysis
- Nanowire Synthesis and Applications
- Organic Electronics and Photovoltaics
- Spectroscopy and Quantum Chemical Studies
- Electrocatalysts for Energy Conversion
- Nuclear Materials and Properties
- Luminescence and Fluorescent Materials
- Graphene and Nanomaterials Applications
- Atomic and Molecular Physics
Physique des interactions ioniques et moléculaires
2004-2024
Aix-Marseille Université
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Jagiellonian University
2019
Weizmann Institute of Science
2009-2010
Princeton University
2008-2010
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.
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...
We have calculated the geometry and electronic structure of isolated lead-phthalocyanine (PbPc) molecule in its ground state. carried out all electron calculations, including relativistic effects density-functional theory formalism using DMOL3 code. In first part we present geometry, which compare to previous x-ray diffraction measurements triclinic monoclinic PbPc crystals. second part, describe ground-state molecule, high-resolution synchrotron-radiation photoelectron spectroscopy valence...
Metal−organic molecule−semiconductor junctions are controlled not only by the molecular properties, as in metal−organic molecule−metal junctions, but also effects of dipole, dipolar link, and charge transfer, all these on semiconductor depletion layer (i.e., internal barrier to transport). Here, we report compare electrical properties (current−voltage, capacitance−voltage, work function) large area Hg/organic monolayer-Si with alkyl alkenyl monolayers moderately highly doped n-Si, combine...
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...
The application of methane as a fuel in the automotive industry shows an increasing tendency, but its release into atmosphere is detrimental due to very high greenhouse effect. For this reason, new solutions for cleaning systems exhaust gas from engines are demand. This study focuses on thorough characterisation active centres, structure–activity relationships, and reaction steps palladium ceria supported catalysts different loading, using situ FTIR method with surface probe molecules....
This work focuses on organic-organic heterojunctions (OOHs) formed between two small-molecule, low band-gap, semiconductors, tris{2,5-bis(3,5-bis-trifluoromethyl-phenyl)-thieno}$[3,4\text{\ensuremath{-}}b,$$h,n]\text{\ensuremath{-}}1,4,5,$$8,9,12$ $\ensuremath{-}\text{hexaaza}\ensuremath{-}\text{triphenylene}$ (THAP), and copper phthalocyanine (CuPc). The organic layers are deposited various substrates, the energy level alignment them is investigated by ultraviolet photoemission...
Following the publication in 2012 of first compelling evidence synthesis silicene, silicon based counterpart graphene, last two years have seen a surge articles on elemental, novel two-dimensional materials beyond graphene. Here, research this burgeoning field is highlighted.
We report on electronic transport measurements through dense monolayers of CH3(CH2)nPO3H2 molecules varying chain lengths, with a strong and stable bond the phosphonic acid end group to <100> GaAs surface Hg top contact. The maintain their high quality during after electrical measurements. Analyses junctions, UV inverse photoemission spectroscopy data band alignments free surfaces, yield insight about mechanism. Transport characteristics for n-GaAs junctions at low forward bias are identical...
Abstract Original reaction pathways can be explored in the on‐surface synthesis approach where small aromatic precursors are confined to surface of single crystal metals. The bis‐indanedione molecule reacted with itself on silver surfaces different ways, through a Knoevenagel or an oxidative coupling, leading formation variety new molecular compounds and covalently‐linked 1D 2D networks. Noteworthy, original products were obtained that cannot synthesized traditional solvent‐based chemistry....
In this paper we investigate the local adsorption geometry of CoPc films adsorbed on a Ag(100) surface and its effect molecule–substrate interactions. Using high-resolution electron energy loss spectroscopy demonstrate that charge-transfer mechanism at organic–metal interface depends structural properties film. We discuss these findings in terms molecular sites, as determined by X-ray photoelectron diffraction measurements multiple scattering simulations. show distance between central Co...
Raman microscopy is one of the methods that could be used for future post-mortem analyses samples extracted from ITER plasma facing.This study shows this technique useful studying tungsten-based materials containing impurities including oxides and nitrides.Here, we apply pulsed laser deposition DC argon glow discharges to produce tungstencontaining synthetic films (compact, porous) nanoparticles investigate influence their morphology on measured spectra.The amounts oxygen and/or nitrogen in...