Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Nanostructures at Surfaces: Dots, Particles, Clusters
O 52.2: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1C
Mobility and apparent height of mass selected copper clusters on well ordered Al2O3 layers studied with STM — •Dominik Wolter1, Raphael Floegel1, Matthias Bohlen1,3, Christoph Schröder1, Conrad Becker2, and Heinz Hövel1 — 1Fakultät Physik / DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France — 3Now at: Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany
Oxide layers are commonly used for industrial purposes (e.g. microelectronics) but also a topic of current research. It was shown previously, that an Al2O3 film on a clean Ni3Al(111) surface can provide a template for metal cluster growth [1,2,3]. The quality of the oxidized surface was investigated with LEED and STM. We evaluate the next-neighbor (NN) distances of deposited Cu clusters in order to learn more about their arrangement on the oxidized surface as well as their apparent height, which strongly depends on the applied bias voltage. First Z(V) single point spectroscopy data is shown. Furthermore the mobility of the clusters at various coverages is analyzed by incremental heating procedures. The normalized NN distances are then compared to Monte Carlo simulation data for various lattices to check whether the clusters attach to the oxide’s template structure. We found strong indication for the fixation of clusters on the so called dot sites of the surface. [1] S. Degen et al., Faraday Discuss. 125, 343-356 (2004) [2] A. Wiltner et al., Thin Solid Films 400, 71-75 (2001) [3] C. Becker et al., New J. Phys. 4, 75.1-75.15 (2002)