Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 89: Metal Substrates: Epitaxy and Growth
O 89.7: Vortrag
Freitag, 29. Februar 2008, 11:00–11:15, MA 041
Double layer growth of Ru on Pt(111) - the contributions of strain and metal-metal bonds — •Petra M. Erne1, András Berkó1,2, Andreas Bergbreiter1, 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
As found in previous STM-studies, vapor deposition of Ru onto Pt(111) leads to the formation of double layer islands of rather small lateral dimensions [1,2], similar to the behavior reported for Co/Cu(111) [3]. In order to clarify wether this behavior is mainly due to the lattice mismatch between Pt(111) and the hexagonally packed Ru(0001) surface, or wether the main reason is a much stronger local Ru-Ru interaction as compared to the Ru-Pt intermetallic bond, we carried out Ru growth experiments on pseudomorphic Pt/Ru(0001) monolayer islands and films, where lattice mismatch effects should play no role. The results indicate that the differences between the Ru-Pt bond and the Ru-Ru bond are the dominating effects.
[1] Poster O 55.61
[2] H. Hoster, T. Iwasita, H. Baumgärtner, W. Vielstich; Phys. Chem. Chem. Phys. 3; 2001, 337.
[3] J. de la Figuera, J.E. Prieto, C. Ocal, R. Miranda; Surf. Sci. 307-309; 1994; 538.