Regensburg 2010 – scientific programme
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BP: Fachverband Biologische Physik
BP 13: Nanoparticles and Viruses
BP 13.5: Talk
Tuesday, March 23, 2010, 15:30–15:45, H45
Excited state energy transfer between CdSe nanocrystals and the isolated phycobiliprotein antenna of A.marina — •Franz-Josef Schmitt1, Vithiya Jeyasangar1, Heinrich Südmeyer1, Max Schoengen1, Vladimir Paschenko3, Hans Joachim Eichler1, and Gernot Renger2 — 1Institute of Optics and Atomic Physics, Berlin Institute of Technology — 2Max-Vollmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology — 3Lomonosov Moscow State University
A quantitative analysis of the interaction between semiconductor nanocrystals and isolated light harvesting complexes from photosynthetic organisms is of relevance for the development of biosensors with enhanced sensitivity. The present work describes results obtained on a hybrid system consisting of CdSe nanoparticles and rod shaped phycobiliproteine (PBP) antenna complexes from the cyanobacterium Acaryochloris marina. The CdSe core of the nanocrystals is covered with a ZnS shell and the surface is functionalised with anions of dihydrolipoic acid leading to electrostatic coupling to the PBPs. The measured time resolved and time integrated fluorescence spectra can be explained by a highly efficient excitation energy transfer from the nanocrystals to the PBP antenna with a time constant of about 200 ps at room temperature. At 0°C a decoupling of about 80 % of the CdSe crystals from the PBP antennae was observed. These results could be relevant for the design of switchable light harvesting systems or controlled fluorescence enhancement.