Step mediated surface alloy formation of Pt/Cu(1 1 1)

Dastoor, P.C., O'Connor, D.J., MacLaren, D. , Allison, W., Noakes, T.C.Q. and Bailey, P. (2005) Step mediated surface alloy formation of Pt/Cu(1 1 1). Surface Science, 588(1-3), pp. 101-107. (doi: 10.1016/j.susc.2005.05.034)

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Medium energy ion scattering has been used to probe the early stages of the development of a surface alloy of platinum deposited on Cu(1 1 1). Our experiments reveal the presence of a novel two-layer "precursor" Pt–Cu alloy at low temperatures prior to formation of the expected Cu<sub>3</sub>Pt surface alloy at near 550 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(12 12 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.

Item Type:Articles
Keywords:Medium energy ion scattering (MEIS), growth, diffusion and migration, step formation and bunching.
Glasgow Author(s) Enlighten ID:MacLaren, Dr Donald
Authors: Dastoor, P.C., O'Connor, D.J., MacLaren, D., Allison, W., Noakes, T.C.Q., and Bailey, P.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
University Centres > Glasgow Materials Research Initiative
Journal Name:Surface Science
ISSN (Online):1879-2758
Published Online:14 June 2005

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