Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 45: Organische Dünnschichten IV

O 45.10: Talk

Tuesday, March 8, 2005, 18:00–18:15, TU EB301

Structural and Topographic Study of clean Porphyrin films — •Karmen Comanici, Florian Maier, Hubertus Marbach , and Hans-Peter Steinrück — Lehrstuhl für Pysikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen

Organic molecules play a prominent role for the development of new materials and molecular devices. An important group of such molecules are porphyrins. Their versatility and distinct chemical and electronic properties makes them promising candidates for tailored catalytic processes and as building blocks for nanoscaled electronic devices.The properties of porphyrins can be modified e.g. by introducing or changing a central metal atom and different ligands. We studied different porphyrins on silver surfaces by means of scanning tunneling microscopy (STM) and low energy electron diffraction (LEED) in ultra high vacuum (UHV). The preparation of the porphyrin layers were done in UHV via sublimation techniques. Ordered porphyrin layers as well as tip induced structural changes in the STM image of the adsorbed fims were observed. One topic to be presented and discussed will be the first time observation of ordered porphyrin layers on an Ag(111) surface.

This work has been funded by Sonderforschunsbereich 583