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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Interfaces and Thin Films I

CPP 17.10: Vortrag

Dienstag, 23. März 2010, 12:15–12:30, H39

Single Molecule Orientation and Binding on Surfaces — •Stefan Krause¹, Danny Kowerko¹, Richard Börner², Christian Hübner², and Christian von Borczyskowski¹ — ¹Chemnitz University of Technology D-09107 Chemnitz, Germany — ²University of Lübeck, D-23538 Lübeck, Germany

Orientation of molecules at a solid interface is an important issue for the modification of surfaces, synthesis, catalysis or photovoltaic. Optical single molecule detection is one of the powerful tools to determine the orientation of even a single molecule via measurement of the orientation of the electric dipole transition. One of the most suited dye molecules to study single molecule orientation is the perylene diimide-type system (PDI) featuring high quantum efficiency and photo stability. Here we present three methods to determine single molecule orientation of PBI selectively bonded via pyridyl groups to silicon dioxide [1]. Using microscope objectives with high numerical aperture allows for the direct determination of the timedependent three dimensional orientation of the transition dipole and the molecule axis [2]. In the second method we directly follow via two detection channels the polarisation of single molecule emission. The third method makes use of the orientation dependent distribution of fluorescence intensities of single molecules and the comparison to calculated distributions.

[1] D. Kowerko, J. Schuster, C. von Borczyskowski, 2009. Molecular Physics, 107, 1911- 1921

[2] J. Hohlbein, C. G. Hübner, 2008. Journal of Chemical Physics, 129, 094703