Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Poster: Nanoparticles and Composite Materials

CPP 36.17: Poster

Mittwoch, 16. März 2011, 17:00–19:00, P2

Competition between diffusion and aggregate formation on a single molecule level — •Frank Gerlach, Daniel Täuber, and Christian von Borczyskowski — Chemnitz University of Technology, Optical Spectroscopy and Molecular Physics, Chemnitz, Germany

Nanoparticles and dye molecules are widely used as fluorescence labels in biophysical and medical applications. For this reason the mutual interaction among these two types of reporter molecules is of special interest. In this communication we use fluorescence and single molecule methods to explore the competition between diffusion of single dye molecules in thin liquid films and aggregate formation between surface attached colloidal semiconductor quantum dots (QD) and perylene bisimide dye molecules. This is a combined study on aggregate formation [1] and diffusion experiments [2]. We observe the diffusion with respect to the competition of the dynamics in thin liquid films with aggregate formation. The formation of assemblies is a sequence of attachments and detachments, which is controlled by the ligands present on the QD surface.

[1] D. Kowerko, J. Schuster, N. Amecke, M. Abdel-Mottaleb, R. Dobrawa, F. Würthner, C. von Borczyskowski, PCCP, 12, 4112, 2010.

[2] D. Täuber, C. von Borczyskowski et al: Diff. Fund. 11, 107, 2009.