Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.37: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

STM/CITS Characterization of 1D and 2D Superstructures Evolving on Pure Highly Ordered Pyrolytic Graphite — •Aaron Gryzia, Marc D. Sacher, Armin Brechling, and Ulrich Heinzmann — Molecular and Surface Physics, Bielefeld University

The last decades have shown highly ordered pyrolytic graphite (HOPG) as one of the most important substrates for studying adsorbates such as metal atoms, organic molecules, polymers and many others by Scanning Tunnelling Microscopy (STM) and Scanning Tunnelling Spectroscopy (STS) techniques. Although HOPG is in use for many years, known effects such as 1D[1] and 2D[2] superstructures have been studied very sparely. These native HOPG superstructures are often very similar to the investigated adsorbates. Therefore the understanding of the properties of the substrate and its special features is of vital importance. In reverse the effects themselves may lead to new applications e.g. in using these 2D-superstructures as templates for adsorbing molecules in array like structures[3]. We focus our research on chain like structures and arrays on HOPG measured by STM and Current Image Tunnelling Spectroscopy (CITS) under UHV conditions in order to understand the origin of these effects. First results of these measurements will be presented.

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