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O: Oberflächenphysik
O 24: Nanostrukturen II
O 24.8: Vortrag
Dienstag, 9. März 2004, 17:30–17:45, H38
Gold clusters in nanopits: growth process and morphology — •T. Irawan, I. Barke, and H. Hövel — Universität Dortmund, Experimentelle Physik I, D-44221 Dortmund
The geometric structure and the growth process of gold clusters on graphite was investigated with scanning tunneling microscopy and transmission electron microscopy. Gold was evaporated on the surface with preformed nanometer sized pits at a temperature of 350 ∘C with rates of 3 × 10−3 … 1.4 × 10−2 ML/s. Here we present a study for a broad range of cluster sizes; starting from small clusters (N ≈ 102 atoms) without facets [1] up to large clusters (N ≈ 104 atoms) with (111) facets on top of the clusters [2]. The cluster shape is described with different geometric models. The position of the clusters at the edge of the pits is determined using STM images before and after a tip induced cluster displacement.
[1] H. Hövel, Appl. Phys. A 72, 295 (2001).
[2] H. Hövel, I. Barke, New J. Phys. 5, 31 (2003).