Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Electronic and Optical Properties of Organic Systems
CPP 12.5: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
Enwrapping of tubular J-aggregates using dye-labeled polyelectrolytes — •Omar Al-Khatib1,2, Helmuth Möhwald1, Jürgen P. Rabe2, Christoph Böttcher3, and Stefan Kirstein2 — 1Max-Planck-Insitute of Colloids and Interfaces, Potsdam, Germany — 2Humboldt University Berlin, Department of Physics, Germany — 3Freie Universität Berlin, Researchcenter for Electron Microscopy, Germany
In this contribution we demonstrate the coating of tubular J-aggregates with dye-labeled polyelctrolytes. The tubular J-aggregates are formed by an amphiphilic cyanine dye in aqueous solutions [1]. Due to the amphiphilic character of the molecules their aggregates possess a negatively charged surface, which can be utilized for the adsorption of oppositely charged polyelectrolytes. Poly(diallyldimethylammonium chloride) (PDAC)and poly(allylamine hydrochloride) (PAH) labeled with different fluorescent dyes may act as donors or acceptors within a Förster energy transfer (FRET) process.
The enwrapping is verified by cryogenic transmission electron microscopy (cryo-TEM). The FRET is investigated by means of optical absorption and fluorescence spectroscopy. These experiments provide evidence for energy transfer between the aggregate and the dye-labeled polyelectrolyte shell.
[1] S.Kirstein, S. Dähne, International Journal of Photoenergy, Volume 2006, Article ID 20363, 1-21