Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Metal substrates: Adsorption of organic / bio molecules VIII
O 75.1: Vortrag
Donnerstag, 17. März 2011, 15:00–15:15, PHY C213
Self-assembled structures of a molecular switch on Ag(111) — •Konrad Boom1, Andreas Schaate2, Boris Ufer2, Peter Behrens2, Jörg Henzl1, and Karina Morgenstern1 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, ATMOS, Appelstraße 2, 30167 Hannover — 2Leibniz Universität Hannover, Institut für Anorganische Chemie, AK Festkörper- und Materialchmie, Callinstraße 9, 30167 Hannover
Molecular switches are a potential answer to meet future requirements of electronics. We investigated one possible molecule, p-hydroxy-azobenzene, on Ag(111) with a low-temperature STM. A coverage of 0.6 ML was deposited at a sample temperature of 213-233K. With these parameters p-hydroxy-azobenzene self-assembles into islands with varying local densities. In some areas the molecules build regular, symmetric, and reoccurring structures. These structures are classified depending on density and regularity. For special structures the molecules have different apparent heights. In some of the structures, it is possible to induce isomerisation of single molecules. The main requirement for that is enough space around the switching molecule. In this presentation we show the classification of the structures and give some examples for likely bindings in prominent structures. Possible origins of the apparent height difference will be discussed.