Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Colloidal and Nanoparticles

CPP 13.13: Vortrag

Dienstag, 26. Februar 2008, 18:15–18:30, C 264

Spectroscopic fingerprints of single dye - quantum dot nanoassemblies — •Danny Kowerko, Jörg Schuster, and Christian von Borczyskowsi — Center of nanostructured materials and analytics, TU-Chemnitz, 09107 Chemnitz

Self assembled nanoassemblies of semiconductor quantum dots (QDs) and organic molecules are of interest for numerous applications in science and technology. However, physics and chemistry of coupling mechanisms and possible interactions (i.e. energy transfer) are complex and thus not yet fully understood. Spectroscopic analysis of nanoassemblies in solution is difficult, since many complex dynamical process are involved [1]. We have chosen an alternative approach to study nanoassemblies by freezing all of the solution dynamics while depositing the nanoparticles in a low concentration on a silicon oxide surface. The solution which we deposit the nanoassemblies from always contains the unbound building blocks too. We may compare spectroscopic properties of the free and bound species on one and the same sample under identical conditions. By recording series of emission spectra of individual quantum dots, dyes and nanoassemblies we obtain very detailed spectroscopic information which allows us to compare the spectroscopic observable quantities for the free and the bound species. We are thus able to extract spectroscopic fingerprints of the nanoassemblies. In this talk we will present results for CdSe quantum dots and functionalized perylene bisimide dye molecules as building blocks for the aforementioned nanoassemblies.

[1] E. I. Zenkevich, C. von Borczyskowski, J. Lum., 122, 784, 2007