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O: Fachverband Oberflächenphysik

O 88: Metallic Nanostructures II (on Semiconductors)

O 88.1: Vortrag

Freitag, 29. Februar 2008, 09:30–09:45, MA 005

Interactions Between Ag Nanoclusters on Carburized W(110) — •Magdalena Bachmann, Martin Gabl, Norbert Memmel, and Erminald Bertel — Institute of Physical Chemistry, University of Innbruck, A-6020 Innsbruck, Austria

Silver nanoclusters arranged in quasi-one dimensional chains were prepared on the R(15x12)-C/W(110) surface. Evidence is presented that these silver cluster chains form thermodynamic equilibrium structures. We address the question of possible interactions between neighbouring clusters by studying the length distributions of silver cluster chains with scanning tunnelling microscopy. Data are compared with theoretical expectations for various cluster-cluster interaction strengths. Best agreement between theory and experiment is obtained for a non-vanishing, slightly repulsive interaction energy of 14 +- 10 meV, despite the rather large cluster distance of 1.4 nm.