1. Electrical Conductivity Measurement of DNA Double-Stranded Chains by 'One-by-One' Cutting Method Using Atomic Force Microscopy
- Author
-
Seiji Heike, Tomihiro Hashizume, Kohzo Ito, Masaaki Fujimori, Aoi Inomata, and Takeshi Shimomura
- Subjects
Arrhenius equation ,Materials science ,Atomic force microscopy ,business.industry ,General Physics and Astronomy ,Conductivity ,Molecular physics ,symbols.namesake ,Nuclear magnetic resonance ,Semiconductor ,Electrical resistance and conductance ,Electrical resistivity and conductivity ,Electrode ,symbols ,Molecule ,business - Abstract
We measured the electrical current-voltage characteristics of λDNA in vacuum using fine electrodes with a gap of about 200 nm. It was found that the electrical resistance of λDNA molecules between the fine electrodes had a large variation: from 7.8 MΩ to values larger than 1 TΩ. This was consistent with the controversial results given in previous reports. The temperature dependence of conductivity was explained well by the Arrhenius equation. In addition, the conductivity of a single molecule of double-stranded λDNA was measured by a “one-by-one” cutting method using atomic force microscopy (AFM). The conductivity was determined to be 3×10 1 S/cm, which is about the same order as that of semiconductors.
- Published
- 2006
- Full Text
- View/download PDF