Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.9: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Size-selected clusters on surfaces studied by local probe: An experimental setup and first results — •Markus Bieletzki1, Marina Pivetta1, Clemens Barth2, and Ulrich Heiz1 — 1Lehrstuhl für Physikalische Chemie, Technische Universität München, Lichtenbergstr. 4, D-85748 Garching, Germany — 2CRMCN-CNRS, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France
During the last decade it has been shown by several groups that clusters with sizes of up to about 30-40 atoms reveal distinct chemical properties which change as function of the precise number of atoms[1,2]. In these experiments the model catalysts were prepared by the deposition of size-selected clusters from the gas phase at low temperatures. Whereas there is strong indication that the clusters remain intact upon deposition, little is known about the dynamics (stability, diffusion, agglomeration) of the clusters at elevated temperatures and under reaction conditions. In order to study the stability of size-selected clusters on oxide surfaces and thin oxide films we built a cluster deposition experiment with size-selection which is coupled to an OMICRON variable temperature scanning probe microscope. In this contribution we present the technical details and specifications of the new experimental setup and show first AFM- and STM-images of cluster assembled materials.
[1] K. Judai, S. Abbet, A. S. Wörz, U. Heiz, C. R. Henry, Journal of the American Chemical Society 2004, 126, 2732.
[2] S. S. Lee, C. Y. Fan, T. P. Wu, S. L. Anderson, Journal of the American Chemical Society 2004, 126, 5682.