Regensburg 2004 – scientific programme

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SYLS: Life Sciences on the Nanometer Scale - Physics Meets Biology

SYLS 3: Symposium "Life Sciences on the Nanometer Scale - Physics Meets Biology"

SYLS 3.33: Poster

Wednesday, March 10, 2004, 16:00–18:30, B

Intrinsic Conductivity of DNA and Polythiophenes — •Hermann Kleine¹, Ralf Wilke¹, Karsten Rott², Jörg Schotter², Katja Tönsing¹, Günter Reiss², Rober Ross¹, and Dario Anselmetti¹ — ¹Experimentelle Biophysik, Fakultät für Physik, Universität Bielefeld — ²Experimentelle Festkörperphysik, Fakultät für Physik, Universität Bielefeld

Charge transfer and transport play an important role in many biological processes and are potentially very interesting for technical applications. Single DNA and poly(3-octylthiophenes) (P3OTs) were stretched over metal-isolator-metal gap structures with 20 - 1 500 nm. The long-range transport of electric charge through single DNA and P3OT molecules were investigated at well-defined experimental conditions in I/V spectroscopy experiments down to a level of attoamperès. The highly debated intrinsic conductance of DNA was found to be very low and mostly dominated by humidity phenomena. The effects of doping and intercalating on the conductivity of DNA and P3OT will be discussed. In addition to the room temperature experiments, the conductivity of P3OT molecules was also investigated in the temperature range of 10 - 300 K.