Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 65: Oxides and Insulators

O 65.1: Poster

Wednesday, March 18, 2015, 18:15–21:00, Poster A

Adsorption behaviour of 2H-Tetraphenylporphyrin on rutile TiO2(110): a room temperature STM investigation — •Martin Drost, Fan Tu, Florian Vollnhals, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

The controlled fabrication of well-defined nanostructures can be addressed by the self-assembly of functional molecules on surfaces. In this regard, we investigate the adsorption behavior of 2H-tetraphenylporphyrin (2HTPP) as a prototype functional molecule on rutile TiO2(110) with scanning tunneling microscopy (STM) mainly at room temperature. A coverage dependent study reveals that at low coverages the 2HTPPs are mainly observed as isolated individual molecules in registry with the Ti-rows of the substrate. With increasing coverage, more and more loosely ordered molecular domains are found. Interestingly, upon moderate heating a significant restructuring of the adsorption system is observed, which yield to the formation of well-ordered supramolecular assemblies of the porphyrins. The specific contributions of molecule-substrate and molecule-molecule interactions will be discussed.

This work was funded by the DFG through grant MA 4246/1-2, research unit FOR 1878/funCOS; and the Excellence Cluster "Engineering of Advanced Materials" granted to the FAU Erlangen-Nürnberg.