Abstract
We have investigated the surface structure and segregation induced by oxygen adsorption on the ordered Pt 3Co(110) alloy using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). For the clean Pt 3Co(110) surface, two different LEED patterns of 1×1 and 2×1 were observed depending on the annealing temperature, which had different Pt (237eV)/Co (LMM) AES intensity ratios. With increasing oxygen exposure at the substrate temperature of 300–500°C, the 2×1 LEED pattern of the clean Pt 3Co(110) surface changed to c(2×4), 1×2, and 1×2+2×1+extra spots patterns, successively, and the Pt/Co AES intensity ratios showed a drastic decrease. Co 2p and O 1s core level spectra by XPS and normal emission valence band spectra by UPS indicated that a Co monoxide overlayer is formed due to a reaction with oxygen at a high-temperature substrate. From these results, it was found that the observed several surface structures are due to the reaction between the segregated Co and adsorbed O atoms to form the stoichiometric CoO-typed overlayer.
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