Berlin 2012 – scientific programme
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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 35.145: Poster
Tuesday, March 27, 2012, 18:15–21:45, Poster B
Switching of an industrial dye-molecule on Au(111) and Ag(111) — •Marcel Müller1, Gerald Dräger2, Konrad Boom1, Friederike Matthaei1, and Karina Morgenstern1 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, Abteilung ATMOS, Appelstraße 2, 30167 Hannover — 2Leibniz Universität Hannover, Institut für Organische Chemie, AK Dräger, Schneiderberg 1B, 30167 Hannover
Molecular switches are an essential part of future ideas in molecular electronics. We investigated a possible candidate, the cyanine astraphloxine, on Au(111) and Ag(111) with a low-temperature STM. We deposit a coverage of 0,022 molecules/nm2 at a sample temperature of 113 K on Au(111) and 0,014 molecules/nm2 at a sample temperature of 83 K on Ag(111). Astraphloxine exists in two different sizes on both surfaces. On Ag(111), the molecule forms smaller clusters while on Au(111) it adsorbs as single molecule. The molecule’s size and shape are changed by manipulation via inelastic tunneling electrons. In this presentation we will show different switching processes and discuss possible interpretations of these processes, in particular which isomerisations are induced. Finally, we will discuss these results in light of a combustion analysis of the molecule.