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O: Fachverband Oberflächenphysik

O 16: Organic, Polymeric, and Biomolecular Films I

O 16.6: Vortrag

Montag, 26. März 2007, 15:30–15:45, H42

Dynamics in ordered networks of adsorbed oligopyridine molecules — •Harry Hoster, Michael Roos, Matthias Roos, Achim Breitruck, and Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, Germany

Using time resolved scanning tunneling microscopy we have studied selected dynamic phenomena in adlayers of bis(terpyridine)derivatives BTP on HOPG, Au(111), and Ag(111) at around room temperature. While the mobility of single molecules is too high for a direct observation in this temperature region, it is possible to evaluate the mobility of island edges and domain boundaries of ordered two dimensional networks. This reveals important information about typical process rates in self assembly processes. The roles of molecule-molecule and molecule-substrate interactions, with a particular focus on anisotropy effects due to the shape of the molecules, are discussed.