Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)

O 14.11: Poster

Montag, 27. März 2006, 18:00–21:00, P2

STM-Study of Cu growth and adsorption of atomic hydrogen on the ZnO(0001)-Zn and ZnO(10-10) surfaces — •Martin Kroll, Thomas Löber, and Ulrich Köhler — Experimentalphysik / Oberflächenphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany

The growth of Cu on ZnO-surfaces was studied as a model system for a catalyst for the low-temperature synthesis of methanol. Scanning tunneling microscopy (STM) was used to analyse the polar ZnO(0001)-Zn surface and the non-polar, mixed terminated ZnO(10-10) surface. The reaction of atomic hydrogen with both ZnO-surfaces was examined as a function of temperature from room temperature up to 700^∘C. For higher temperature an etch-attack was found. The influence of temperature and a hydrogen pre-coverage on the morphology of copper clusters was determinated. A bimodal distribution of copper-clusters was found after annealing. Additionally, also the adsorption of water was studied.