Berlin 2008 – wissenschaftliches Programm
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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
Mittwoch, 27. Februar 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 Behm1 — 1Institute 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 50-500∘C was studied by high resolution STM and Auger electron spectroscopy (AES). Ru deposition at temperatures up to 250∘C 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 300∘C 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.