Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)

O 14.46: Poster

Monday, March 27, 2006, 18:00–21:00, P2

Coadsorption of 1-decanethiol and PTCDA on Ag(111)–surfaces in the submonolayer regime — •Florian Pollinger, Stefan Schmitt, Christian Kumpf, Achim Schöll, and Eberhard Umbach — Exp. Phys. II, Univ. Würzburg, 97074 Würzburg

Deposited on vicinal Ag(111) the planar molecule 3,4,9,10–perylenetetracarboxylic acid–dianhydride (PTCDA) induces a surface rearrangement by step bunching and subsequent facetting. The resulting supersteps form a grating-like pattern on mesoscopic dimensions by self-organization. As a consequence, one receives a template structure on nanometer scale from both a morphologic and chemical point of view.

One possible application of such a template is the growth of an organic coadsorbate. As a candidate, we chose 1–decanethiol, an often investigated archetype molecule forming self–assembled monolayers (SAMs) on noble metals. The coadsorption behaviour has been investigated on saturated monolayers and submonolayers of PTCDA on Ag(111) surfaces with XPS, STM and TDS.