Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Focussed session: Functional molecules at surfaces I

O 30.2: Topical Talk

Dienstag, 27. März 2012, 10:45–11:15, A 053

Surface-supported molecular assemblies: insight from scanning tunneling microscopy and photoemission experiments — •Meike Stöhr — Zernike Institute for Advanced Materials, University of Groningen, Netherlands

The interest in studying organic nanostructures on surfaces emerges from their prospective applications in nanoscale electronic or optoelectronic devices, in which the spatially addressable functional units are to be assembled on the molecular level. By making use of molecular recognition processes based on non-covalent interactions, well-ordered 1D and 2D molecular structures can be formed on surfaces. The understanding of the interplay of the underlying intermolecular and molecule substrate interactions is highly important since the resulting molecular structures are based upon these two interactions. For the formation of molecular structures with improved stability and conductivity, the concept of on-surface polymerization has been introduced recently.

In my presentation, I will focus - on the basis of perylene derivatives adsorbed on Cu(111) - on surface-supported molecular assemblies based on non-covalent interactions [1]. The assembly structures can be altered through post-annealing of the sample. Thereby, also the intermolecular interactions are varied. Through the combination of experimental and theoretical methods, the electronic and structural properties have been elucidated.

[1] J. Lobo-Checa et al., Science 325 (2009) 300; M. Matena et al., Chem. Eur. J. 16 (2010) 2079.