Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.5: Poster

Tuesday, April 1, 2014, 18:30–22:00, P1

Coverage dependent adsorption behavior of Ni-TPBP on Cu(111): A scanning tunneling microscopy study — •Michael Lepper, Liang Zhang, Michael Stark, Stefanie Ditze, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

In order to design self-assembled supramolecular architectures with specific functional properties it is necessary to understand the adsorption behavior of molecular building blocks on well-defined substrates. One very versatile class of adsorbates in this regard are porphyrins which offer not only a rigid molecular framework but also ligand functionality to bind metals. In this study, we investigate the coverage dependent supramolecular arrangement of Ni(II)-tetraphenylbenzoporphyrin (NiTPBP) on Cu(111) with scanning tunneling microscopy at room-temperature (RT) in ultra-high vacuum (UHV). At low coverage, we observed adsorption of the porphyrin molecules at the steps. By increasing the coverage island formation of NiTPBP is promoted. Interestingly, we were able to monitor three different molecular appearances of the NiTPBP islands at the same coverage and temperature.