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 35.66: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
STM of size selected silver and copper clusters deposited on Au(111) and C60/Au(111) — •David Engemann1, Niklas Grönhagen1, Natalie Miroslawski1, Bernd von Issendorff2, Tommi T. Järvi3, Michael Moseler2,3,4, and Heinz Hövel1 — 1Technische Universität Dortmund, Experimentelle Physik I — 2Albert-Ludwigs-Universität Freiburg, Physikalisches Institut — 3Fraunhofer-Institut fuer Werkstoffmechanik IWM, Freiburg — 4Freiburger Materialforschungszentrum
Size selected silver and copper clusters with sizes in between 34 atoms to 147 atoms were soft landed on clean Au(111) and Au(111) covered with 1 and 2 ML C60 and measured with scanning tunneling microscopy (STM) at 77K. We observed a deformation of the cluster shape due to the strong metallic interaction between the clusters and Au(111). The silver clusters became epitaxial and developed a structure composed of several monolayers. The number of these monolayers depends on the number of atoms in the clusters and the deposition energy. The larger the cluster mass the more monolayers the clusters develops on Au(111) and the larger the deposition energy the fewer monolayers occur. These results are compared with molecular dynamic simulations and other atomistic calculations. The clusters were annealed up to room temperature and afterwards measured with STM at 77K. On 1 ML C60 all cluster heights became smaller after annealing. We compare these results for copper and silver clusters. Resulting differences may be explained with the fact that for the same number of atoms copper clusters are smaller than silver clusters.