Regensburg 2007 – scientific programme
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O: Fachverband Oberflächenphysik
O 15: Methods: Scanning Probe Techniques II
O 15.6: Talk
Monday, March 26, 2007, 15:30–15:45, H41
Influence of the Local Adsorption Environment on the Intra-Molecular Contrast of Organic Molecules in Non-Contact Atomic Force Microscopy — •Andre Schirmeisen1, Bartosz Such2, Domenique Weiner1, and Harald Fuchs1 — 1Center for Nanotechnology (CeNTech), University of Münster, Heisenbergstr.11, 48149 Münster, Germany — 2Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
Organic molecules have fascinating electrical and optical properties making them promising candidates as fundamental building blocks for miniaturized and high-capacity electronic devices. In the effort to exploit the opportunities offered by organic molecules, however, one has to take into account that the local chemical environment of the molecule may strongly influence its properties. Thin epitaxial layers of the organic molecule 3,4,9,10-perylenetetracarboxylic dianhydrite (PTCDA) on a Cu(111) surface were imaged using non-contact atomic force microscopy in ultrahigh vacuum [1]. The second layer molecules show a distinct intra-molecular structure, which is compared to the internal charge distribution of the molecule. The molecules in the first layer, though, exhibit no detectable intra-molecular features. This effect is discussed with respect to the presence of the metallic substrate for the first layer molecules, which demonstrates the strong influence of the local adsorption environment on the internal electronic properties of organic molecules. [1] Such et al., Appl. Phys. Lett. 89, 093104 (2006)