期刊
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS
卷 18, 期 3, 页码 1010-1015出版社
AMER INST PHYSICS
DOI: 10.1116/1.582292
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A real-time in situ study of the initial stages of the interaction of oxygen with Ni(111) in a high temperature scanning tunneling microscope (STM) at temperatures between 400 and 470 K is presented. Oxygen adsorption features, in particular the Ni(111)-p(2X2)O reconstruction, were identified in room temperature STM images. The process of oxide formation is investigated in detail at 470 K. Starting from the initial nucleation at the step edges, a gradual transformation of the terrace structure results in the formation of a three-domain NiO(001) layer finally covering: the entire terraces as well as forming bulges at the steps due to surface diffusion of excess Ni. Well-resolved local oxide surface structures are discussed on the basis of a thin (001)-oriented NiO layer model on the Ni(111) substrate. Formation of triangular bulk NiO(111) islands is observed for higher oxygen exposures above 25 L. (C) 2000 American Vacuum Society. [S0734-2101(00)00203-7].
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