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Sökning: WFRF:(Yurakov Yu A)

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1.
  • Domashevskaya, E. P., et al. (författare)
  • Electronic structure of undoped and doped SnOx nanolayers
  • 2013
  • Ingår i: Thin Solid Films. - : Elsevier BV. - 0040-6090 .- 1879-2731. ; 537, s. 137-144
  • Tidskriftsartikel (refereegranskat)abstract
    • Results of electronic structure investigations for tin oxide nanolayers obtained by tin magnetron sputtering and their following oxidation in air at different temperatures are presented. Using X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) spectroscopy techniques it was shown that at the 240 degrees C anneal a predominant phase in the sample surface layers is tin monoxide. With the annealing temperature increase up to 450 degrees C the phase composition corresponds to tin dioxide. Rather high sorption sensitivity for the samples oxidized at 450 degrees C was found. The compositional model of the gap structure based on XANES and XPS data matching for SnOx nanolayers revealed occurrence of the crossed transitions with the energy of similar to 3.7 eV in the presence of two phases: the SnO and the SnO2 or SnOx with vacancies. Under surface doping of SnO2 nanolayers with palladium PdO and PdO2 is observed where PdO is the most intensive component. O-2 and H-2 multiple alternate exposures resulted in the disappearance of palladium dioxide and PdO recovery to the metallic Pd. Under Pd bulk doping of nanolayers PdO and PdO2 were observed in the surface layers. In this case PdO2 was presented by two types of particles different in size, one of them having the greatest binding energy of Pd 3d(5/2) (339.0 eV). (C) 2013 Elsevier B.V. All rights reserved.
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2.
  • Domashevskaya, EP, et al. (författare)
  • XPS and XANES studies of SnOx nanolayers
  • 2008
  • Ingår i: Journal of Structural Chemistry. - New York : Springer. - 0022-4766 .- 1573-8779. ; 49:Suppl 1, s. 80-91
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents the results of our XPS (X-ray photoelectron spectroscopy) and XANES (X-ray absorption near edge structure) Studies of tin oxide nanolayers obtained by magnetron spraying of the metal and its further oxidation in air at different temperatures. It was shown that at 240 degrees C (annealing temperature), tin monoxide was dominant in the surface layer of the samples. When the temperature was increased to 450 degrees C, the phase composition corresponded to tin dioxide. Increased sorption ability was found for the samples oxidized at 450 degrees C. The band structure model of SnOx nanolayers obtained by superposition of the XANES and XPS data revealed cross transitions with energy similar to 3.7 eV in the presence of the SnO and SnO, phases. Surface doping of nanolayers with palladium gave the Pd, PdO, and PdO2 components, among which PdO was most intense. Alternate treatments with O-2 and H-2 gases led to the disappearance of palladium dioxide and the reduction of PdO to the Pd metal. After the volume doping of nanoplayers with palladium, the surface layer contained PdO and PdO2; the latter was represented by two types of particles with different sizes.
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