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O: Fachverband Oberflächenphysik
O 10: Nanostructures at Surfaces I
O 10.10: Talk
Monday, March 11, 2013, 12:45–13:00, H45
Supported Silver Nanoparticles for Catalytic Reactions: A RHEED Study — •Stephan Bartling, Ingo Barke, Hannes Hartmann, and Karl-Heinz Meiwes-Broer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany
Size-selected Ag clusters deposited on amorphous alumina films can act as selective and efficient nanocatalysts for the partial oxidation of propylene [1]. In this contribution we present results for in situ reflection high energy electron diffraction (RHEED) from soft-landed Ag clusters in the size range of a few nm. The focus is placed on the alignment between particles and substrate that is driven by cluster-surface interaction. Whereas on highly ordered surfaces pronounced alignment was particularly found for small clusters [2], on thin Al2O3 layers deviations from a random orientation can only be observed for large Ag clusters (≤10 nm). The analysis of such spontaneous orientation along high-symmetry crystal directions parallel to the surface is assisted by ex situ AFM measurements.
[1] L.M. Molina et al., Catalysis Today 160, 116 (2011)
[2] A. Kleibert et al., Phys. Status Solidi B 247, 1048 (2010)