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Abstract:
By using STM, LEED and ISS we have studied the condensation of Pt on clean NiAl(110) and on a thin ordered Al2O3 film grown on NiAl(110). On Al2O3/NiAl(110) and up to a coverage of one monolayer Pt forms highly dispersed two-dimensional islands with an average diameter of 10–30 Å whose density increases with the coverage. For higher Pt coverage the formation of three-dimensional Pt clusters is observed. Annealing of the Pt-covered surface leads to a diffusion of Pt into the oxide film. On clean NiAl(110) and up to one monolayer we found two-dimensional growth of Pt the density of the islands remaining approximately constant.
