Angle-resolved XPS investigations of the interaction between O2 and Mo2C/Mo(1 0 0)

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Abstract

The interaction of oxygen with a carbidized Mo(1 0 0) surface was investigated at different temperatures (300 K-1000 K) with-angle resolved X-ray photoelectron spectroscopy. A carbide overlayer with a homogeneous Mo 2C stoichiometry (down to the information depth of XPS) was produced by the high-temperature decomposition of C2H4 on Mo(1 0 0). O2 adsorbs dissociatively on Mo2C/Mo(1 0 0) at room temperature. Oxidation of the carbide at 800 K results in the partial removal of carbon and leads to sub-surface O migration, accompanied by the appearance of highly oxidized Mo states. Raising the O2 adsorption temperature to 900 K decreased the carbon content further, without affecting the amount and the distribution of adsorbed O. Performing the oxidation at 1000 K led to an even more effective removal of carbon, but the oxygen content of the surface region was also reduced.

Original languageEnglish
Pages (from-to)204-207
Number of pages4
JournalVacuum
Volume80
Issue number1-3
DOIs
Publication statusPublished - Oct 14 2005

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Keywords

  • Angle-resolved X-ray photoelectron spectroscopy
  • Molybdenum carbide
  • Oxidation

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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