One dimensional Confinement of Electric Field and Humidity Dependent DNA Conductivity

Details One dimensional Confinement of Electric Field and Humidity Dependent DNA Conductivity One dimensional Confinement of Electric Field and Humidity Dependent DNA Conductivity

2009-08-28

arxiv.org/abs/0908.4093v2

The Journal Of Chemical Physics 131, 245102 (2009)

Physics

Chemical Physics

16 pages, 5 figures, published in Journal of Chemical Physics

Scientific paper

The dependence of DNA assemblies conductance on relative humidity is investigated theoretically. Following earlier suggestions, we consider the ionic conductivity through the layers of water adsorbed by DNA molecules. The increase in humidity results in a growing water layer. The binding energy of ions depends on the thickness of the water layer due to change in water polarization. This dependence is very strong at smaller thicknesses of water layers due to the low-dimensional confinement of an electric field in water. We show that the associated change in ion concentration can explain the six orders of magnitude increase in conductivity, with relative humidity growing from 0.05 to 0.95

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