Electrical Conductivity of Lambda DNA-Pd Wire

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  • Hosogi Maho
    Department of Intelligent Mechanical Systems Engineering, Faculty of Engineering, Kagawa University
  • Hashiguchi Gen
    Department of Intelligent Mechanical Systems Engineering, Faculty of Engineering, Kagawa University
  • Haga Masa-aki
    Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University
  • Yonezawa Tetsu
    Department of Chemistry, School of Science, The University of Tokyo
  • Kakushima Kuniyuki
    Institute of Industrial Science, The University of Tokyo
  • Fujita Hiroyuki
    Institute of Industrial Science, The University of Tokyo

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We investigated the electric conduction of lambda DNA molecules covered with Pd colloids using micromachined DNA tweezers that has a pair of opposing probes for retrieving DNA molecules. The molecules were retrieved from a solution containing lambda DNA by applying RF power between the probes in the solution. The retrieved molecules were then soaked in a colloidal solution containing cationic Pd particles, which results in a DNA–Pd wire bridged between the tweezer probes. Current–voltage curves for the DNA–Pd wire can be measured between the DNA tweezers probes, and the resistivity of the DNA–Pd wire was approximately 74 Ω cm.

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