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Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.61: Poster

Wednesday, February 27, 2008, 18:30–19:30, Poster F

Temperature effects in the growth of Ru on Pt(111)András Berkó1,2, •Andreas Bergbreiter1, Petra M. Erne1, Harry E. Hoster1, and R. Jürgen Behm11Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Permanent Adress: Institute of Surface Chemistry and Catalysis, University of Szeged, H-6701 Szeged, Dóm tér 7, Hungary

The growth of Ru on Pt(111) at substrate temperatures in the range of 50-500C was studied by high resolution STM and Auger electron spectroscopy (AES). Ru deposition at temperatures up to 250C leads to the formation of triangular bilayer islands [1]. The lateral dimensions of these bilayer islands become more uniform with increasing substrate temperature, but show little dependence on evaporation rate and Ru coverage. At deposition temperatures of 300C or higher, in contrast the islands are only of monoatomic height. Based on STM-imaging with chemical contrast and AES analyses, this is associated with the onset of surface alloy formation. The influence of the different strengths of Pt-Pt, Pt-Ru, and Ru-Ru interactions as well as the role of lattice mismatch effects are discussed.

[1] H. Hoster, T. Iwasita, H. Baumgärtner, W. Vielstich; Phys. Chem. Chem. Phys. 3; 2001; 337.

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