V2O3(0 0 0 1) on Au(1 1 1) and W(1 1 0): Growth, termination and electronic structure

A. C. Dupuis, M. Abu Haija, B. Richter, H. Kuhlenbeck, H. J. Freund

Research output: Contribution to journalArticlepeer-review

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Abstract

We have prepared well-ordered V2O3(0 0 0 1) films with thicknesses between 60 and 160 Å on W(1 1 0) and Au(1 1 1). These films have been studied with respect to the surface electronic and geometric structure and the interaction with oxygen. We find that after preparation with oxygen the surface is terminated by vanadyl groups. The surface may be reduced by electron bombardment. Oxygen adsorption with subsequent annealing restores the vanadyl groups. The vanadyl groups are thermally stable on the surface until at least 1000 K under UHV conditions. In XPS spectra of the vanadyl terminated surface a V2p induced surface state becomes visible under surface sensitive conditions. The binding energy shift of this state is compatible with a higher oxidation state of the vanadium atoms on the surface as compared to the bulk atoms. The V2p surface state induces additional intensity also in NEXAFS spectra as concluded from a set of spectra recorded with two different methods.

Original languageBritish English
Pages (from-to)99-112
Number of pages14
JournalSurface Science
Volume539
Issue number1-3
DOIs
StatePublished - 1 Aug 2003

Keywords

  • Electron energy loss spectroscopy (EELS)
  • Gold
  • Near edge extended X-ray absorption fine structure (NEXAFS)
  • Phonons
  • Tungsten
  • Vanadium oxide
  • Visible and ultraviolet photoelectron spectroscopy
  • X-ray absorption spectrscopy
  • X-ray photoelectron spectroscopy

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