Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.147: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

Efficient energy transfer in perylene-nanotube complexes — •Friederike Ernst¹, Timm Heek², Antonio Setaro¹, Rainer Haag², and Stephanie Reich¹ — ¹Institut für Physik, Freie Universität Berlin — ²Institut für Chemie, Freie Universität Berlin

Carbon nanotubes are interesting for biomedical applications because they emit in the IR part of the spectrum; establishing nanotube-adsorbant energy transfer complexes in aqueous solution is thus a key step towards the complex non-covalent functionalization of nanotubes in biocompatible environments. We demonstrate direct energy transfer in perylene-imido-diester nanotube complexes in water: upon excitation of the adsorbed perylene unit we observe an emission from the carbon nanotubes, which indicates a successful excitation transfer. The efficiency of the indirect excitation via the adsorbant is of the same order of magnitude as the direct excitation of the nanotubes. Furthermore the perylene-imido-diester compound simultaneously serves as a surfactant for the nanotubes with a strong chirality preference for tubes with a small E11 transition energy, obliterating the need for a supplementary surfactant. We thus created a self-sufficient excitation transfer complex which is stable in an aqueous medium over many months.