Impedance measurements on a DNA junction

Sungmin Hong, Luis A. Jauregui, Norma L. Rangel, Huan Cao, B. Scott Day, Michael L. Norton, Alexander S. Sinitskii, Jorge M. Seminario

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Abstract

1 μm double-stranded DNA molecules are immobilized between pairs of gold and pairs of platinum microelectrodes with gaps of 0.4 and 1 μm, respectively, and their electrical characteristics are determined under the application of constant and sinusoidal bias voltages. Due to their extremely high impedance for constant voltage bias, the samples of DNA are excellent insulators; however, their impedances show strong frequency dependence in the range of 10 Hz-7.5 MHz. Favorable response in the gold electrodes is attributed to the higher ability of DNA molecules to bridge the narrower gold electrode gaps in contrast to that in the wider platinum junctions.

Original languageEnglish (US)
Article number201103
JournalJournal of Chemical Physics
Volume128
Issue number20
DOIs
Publication statusPublished - Jun 6 2008

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Hong, S., Jauregui, L. A., Rangel, N. L., Cao, H., Day, B. S., Norton, M. L., ... Seminario, J. M. (2008). Impedance measurements on a DNA junction. Journal of Chemical Physics, 128(20), [201103]. https://doi.org/10.1063/1.2937127