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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.71: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Oxidative properties of ComPtn clusters — •Ivan Baev, Kai Chen, Steffen Fiedler, Michael Martins, and Wilfried Wurth — Universität Hamburg, Institut für Experimentalphysik
From investigations of the magnetic properties of ComPtn clusters with XMCD it could be seen that the presence of Pt in these clusters can enhance their probability to oxidize. Now these oxidative properties are studied systematically.
It is possible to create small, mass-selected clusters with the size of several atoms with the "ICARUS" cluster source. The created clusters are landed onto a Cu(100) surface with a surface coverage of approximately 5% and investigated with XPS. We measure the Co-2p photoemission lines of Co, Co2, CoPt and Co2Pt clusters to gather information about their oxidative properties. The goal is to measure the change in shape and position of the 2p-lines if the clusters are exposed to a particular oxygen atmosphere and temperature. For comparison CoO and Co2O clusters can also be created directly with "ICARUS".
A proof of the oxidative properties of Pt in ComPtn clusters is a starting point to search for other reactions that are mediated by ComPtn.
The small size of ComPtn clusters allows in principle to conduct in depth theoretical calculations. This can lead to new predictions of catalytic active clusters.
This work is supported by the DFG through the collaboration research center SFB 668.