Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9594616 | Surface Science | 2005 | 7 Pages |
Abstract
Medium energy ion scattering has been used to probe the early stages of the development of a surface alloy of platinum deposited on Cu(1Â 1Â 1). Our experiments reveal the presence of a novel two-layer “precursor” Pt-Cu alloy at low temperatures prior to formation of the expected Cu3Pt surface alloy at near 550Â K. Comparison of the alloying behaviour of one monolayer of platinum on a nominally flat copper surface with that on a vicinal copper surface, Cu(12Â 12Â 11), demonstrates that the formation of this precursor alloy is mediated by steps on the surface. A model is proposed for the mechanism of formation of this precursor alloy, which occurs at much lower temperatures than previously observed for surface alloying of the platinum-copper system.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
P.C. Dastoor, D.J. O'Connor, D.A. MacLaren, W. Allison, T.C.Q. Noakes, P. Bailey,