Modification of MoO3 surfaces by vapour-deposited cobalt atoms
| Autor: | L. Viscido, J.M. Heras, D. Borgmann, R. Kleyna, M. Voß, H. Mex |
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| Rok vydání: | 1999 |
| Předmět: |
Annealing (metallurgy)
Surface chemical reaction Inorganic chemistry chemistry.chemical_element Surfaces and Interfaces Molybdate Condensed Matter Physics Layer thickness Spectral line Surfaces Coatings and Films chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry Materials Chemistry Crystallite Cobalt |
| Zdroj: | Surface Science. :723-727 |
| ISSN: | 0039-6028 |
| Popis: | The interaction of evaporated cobalt atoms with polycrystalline MoO3 surfaces was studied by means of X-ray photoelectron spectroscopy (XPS). In several steps cobalt was evaporated onto the clean MoO3 surface at 300 K. With increasing cobalt layer thickness a shoulder in the Mo 3d spectra indicated the formation of Mo4+ and Mo5+. From the very beginning of the evaporation the Co 2p spectra showed the appearance of Co2+ and at higher coverages that of Co0. Subsequent stepwise annealing of the sample up to 800 K revealed that nearly the whole amount of Co0 species is also oxidized and a non-stoichiometric cobalt molybdate is formed. |
| Databáze: | OpenAIRE |
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