Abstract
Pt-decorated Au nanostructures and bimetallic PtAu nanoparticles have been shown to actas catalysts. Consequently we investigate the formation of extended Pt decorations of anAu island edge on Au(111) as possible catalysts. The investigation is by simulation usingthe kinetic Monte Carlo method. The effects of varying the rate of deposition of Pt atomsand the simulation temperature on the morphology of the resulting Pt nanostructureswere investigated. The thickness and roughness of the nanostructures are readilyinfluenced, with temperature being the more important factor. A combination of bothhigh temperature and low deposition rate was the most effective at reducing theroughness. PtAu alloying in the Au island edge was identified. This work is (tothe best of our knowledge) the first kinetic Monte Carlo simulation study of theformation of Pt nanostructures on Au. We demonstrate how the morphologyof the Pt nanostructures can be controlled. The nanostructures studied here,comprising an adjustable mix of Pt overlayers and novel 1D PtAu surface alloys, areexpected to be of considerable interest as potential bimetallic nano-catalysts.
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