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O: Fachverband Oberflächenphysik

O 31: Nanostructures at surfaces: Dots, particles, clusters, arrays II

O 31.7: Vortrag

Dienstag, 15. März 2011, 12:45–13:00, WIL C107

O2 and CO on noble metal clusters on C/W(110) templates — •Magdalena Bachmann, Norbert Memmel, and Erminald Bertel — Institute for Physical Chemistry, University of Innsbruck, Austria

Small noble-metal (especially Au) clusters on oxidic supports have gained a lot of attention in the last years due to their high activity and selectivity as catalysts for CO oxidation reaction. The importance of cluster-size effects and influence of the substrate material are still discussed controversially. We introduce two differently carburized W(110) surfaces (i.e. R(15x12)C/W(110) and R(15x3)C/W(110)) as templates for the growth of two different types of Au, Ag and Cu nano-clusters. Investigation of the adsorption properties of the reactants CO and O2 on these surfaces might yield illuminative results concerning the Au-catalyzed CO oxidation. In a first step towards this goal the influence of the reaction gases on the stability of the nano-clusters was investigated by scanning tunnelling microscopy. Differences and similarities concerning gas induced alterations on different types of clusters are discussed.