10 research outputs found
Chemistry of gold(I, III) complexes with organic ligands as potential MOCVD precursors for fabrication of thin metallic films and nanoparticles
The present review deals with the chemistry of complexes of gold(I) and gold(III) with organic ligands. Compounds classified according to the type of coordinating ligands and donor atoms are considered from the point of view of their potential application as precursors in the MOCVD process, which attract considerable scientific interest. This method has undeniable advantages over other technologies (precision multi-parameter monitoring in order to control the properties of the obtained coatings, high utilization of precursors, simple equipment design, etc.) and can be used to produce thin films and gold nanoparticles with desired characteristics on different types of surfaces of complex geometries for various engineering applications. The following main results published to date are summarized and analyzed in this review: (a) chemical approaches to synthesis, structural characteristics and properties of the main classes of organic compounds of gold (I, III), (b) thermal stability of gold compounds in solid state, (c) temperature-dependent measurements of vapor pressure used for the characterization of gold compound volatility, (d) thermolysis processes of gold complex vapor on heated substrates, (е) examples of modern high-precision applications of gold precursors in MOCVD technique of metallic layers and nanoparticles. Mechanisms and growth processes of gold films and nanoparticles, their composition, structure, and characteristics are also considered
Relativistic Laser-Matter Interaction and Relativistic Laboratory Astrophysics
The paper is devoted to the prospects of using the laser radiation
interaction with plasmas in the laboratory relativistic astrophysics context.
We discuss the dimensionless parameters characterizing the processes in the
laser and astrophysical plasmas and emphasize a similarity between the laser
and astrophysical plasmas in the ultrarelativistic energy limit. In particular,
we address basic mechanisms of the charged particle acceleration, the
collisionless shock wave and magnetic reconnection and vortex dynamics
properties relevant to the problem of ultrarelativistic particle acceleration.Comment: 58 pages, 19 figure
Interface Properties of VOPc on Ni 111 and Graphene Ni 111 Orientation Dependent Charge Transfer
Interface
properties of VOPc films on Ni(111) and graphene/Ni(111)
were investigated by X-ray photoemission spectroscopy (XPS), ultraviolet
photoemission spectroscopy (UPS), and X-ray absorption spectroscopy
(XAS). The XAS spectra reveal that the molecules grow highly ordered
on both substrates, flat lying on the substrate surface. On Ni(111),
strong interactions between vanadium ions of the VOPc molecules and
the substrate were observed. It seems, however, that not all molecules
of the first monolayer interact with the substrate. Scanning tunneling
microscopy (STM) suggests that the strength of the interaction depends
on the molecular orientation (oxygen-up or oxygen-down). The interaction
can be completely prevented by graphene as an intermediate layer.
Graphene affects not only the strength of the interaction at the interface,
but also the energy level alignment
Chemical Reaction of Polar Phthalocyanines on Silver Chloroaluminum Phthalocyanine and Fluoroaluminum Phthalocyanine
Interface
properties of chloroaluminumÂ(III) phthalocyanine (AlClPc)
and fluoroaluminumÂ(III) phthalocyanine (AlFPc) on different silver
surfaces have been studied using X-ray and ultraviolet photoemission
spectroscopy (XPS and UPS) and X-ray absorption spectroscopy (XAS).
Both polycrystalline silver foil and silver single crystals were used
as a substrate. In all cases a chemical reaction was detected by XPS,
visible as additional species in chlorine or fluorine core level spectra.
However, UPS spectra show additional intensity in vicinity of the
Fermi edge only for monolayer coverages of AlClPc and AlFPc on silver
foil. Possible scenarios for the different interaction on polycrystalline
and single-crystalline silver surfaces are discussed. The roughness
of the substrate may influence the strength of the interaction significantly
Thermodynamic and spectroscopic properties and low temperature thermochromism of chromium tris-acetylacetonate
Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal