Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.54: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Oxidation behavior of orientated brass surfaces investigated with STM, XPS and LEED — •Andreas Zychma, Renate Wansing, and Alexander Birkner — Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum

In heterogeneous catalysis, especially in methanol synthesis, the system Cu/ZnO plays an important role. Particularly the metal-substrate interaction of copper and zinc oxide is of great interest. While many groups therefore study the system copper on zinc oxide, we investigate the behavior of zinc oxide on copper, the so called 'inverse system'. For that we use brass single crystals with an amount of 15 percent zinc. After oxygen exposure in ultra high vacuum at different substrate temperatures the stepwise formation of zinc oxide and copper oxide can be observed with x-ray photoelectron spectroscopy (XPS). Additionally low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) as well as spectroscopic measurements with the STM are performed to investigate the formation process of zinc oxide and copper oxide on brass surfaces with different crystal orientation.