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Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 6: Thin Film Characterization: Structure Analysis and Composition (XRD, TEM, XPS, SIMS, RBS,...)

DS 6.10: Talk

Monday, March 31, 2014, 17:30–17:45, CHE 89

Investigating the oxidation process of the Pt3Ti(111) alloy surface on the atomic scale — •Marco Moors1,2, Maria Buchholz2,3, Séverine Le Moal2,4, Klaus Wandelt2,5, and Rainer Waser11Forschungszentrum Jülich — 2Universität Bonn — 3Karlsruher Institut für Technologie — 4Université Paris Sud — 5University of Wroclaw

The oxidation of reactive bimetallic alloys like the Pt3Ti(111) surface is a promising approach to grow atomically thin titanium oxide films with a high degree of surface order on a metallic conducting substrate. Depending on the used preparation conditions several ordered oxide phases with both rectangular and hexagonal symmetry have been observed. The morphology of these phases is dominated by the surface strain caused by the interplay of the hexagonal substrate symmetry and the favoured rectangular oxide symmetry.

In this presentation the focus is set on the investigation of the first steps of the complex oxidation process on the atomic scale. At low oxygen pressures a titanium oxide phase with a characteristic zigzag structure is formed by a temperature induced segregation process of titanium atoms from the bulk to the outermost surface layer. By variation of the oxygen dosage and temperature the oxide coverage can be controlled ranging from small single islands up to the complete coverage of the entire surface. Due to the surface strain in all cases a regular arrangement of surface defects along the trenches between the zigzag lines can be observed, which may be important for the catalytic activity as well as for self assembly processes.

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