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.
- Angle-resolved X-ray photoelectron spectroscopy
- Molybdenum carbide
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces, Coatings and Films