Au Interaction with CeO2 (111) Thin Film
نویسندگان
چکیده
The interaction of gold with CeO2(111) layer was investigated with photeelectron spectroscopy (PES) and by means of resonant photoelectron spectroscopy (RPES). Gold was deposited in steps onto a 1.5 nm thick CeO2(111) layer, epitaxially grown on a Cu(111) substrate. The RPES showed a partial Ce → Ce reduction, observed as a resonant enhancement of the 4f level of the Ce species. This can be explained by creation of a new Au ionic state located in Au 4f spectra. The observed effects are stronger for Au deposition at room temperature than 250 °C. The results can be interpreted as a formation of a CeAuxO2 compound produced by gold – cerium oxide interaction. The formed compound is probably located at the gold – cerium oxide interface.
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