Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Supramolecular Aggregates

CPP 1.4: Talk

Monday, March 26, 2007, 10:30–10:45, H37

Single molecule spectroscopy of dye - quantum dot nanoassemblies on surfaces — •Danny Kowerko, Jörg Schuster, and Christian von Borczyskowski — Center of nanostructured materials and analytics, TU Chemnitz, 09107 Chemnitz

Nanoassemblies of semiconductor quantum dots (QDs) and organic molecules are promising objects of research and application in many fields of science and technology. Physics and chemistry of coupling mechanisms and possible interactions (i.e. energy transfer) are complex and thus not yet fully understood. Förster resonance energy transfer has been proven to be one reason for quenching of CdSe QDs luminesence in the presence of pyridyl porphyrin molecules [1]. Already observed QD luminescence quenching in pyridyl functionalized perylenebisimide solutions promises such systems on a single molecule/single nanoparticle level. In order to be able to use such spectroscopic techniques even at cryogenic temperatures nanoassemblies need to be immobilized on surfaces. Here we report on the preparation and spectroscopic characterization of dye - QD assemblies on silica surfaces. We will show that there is clear evidence that such assemblies are formed in solution and are stable on the surface. [1] E. I. Zenkevich et al, J. Phys. Chem. B, 109, 8679, 2005.