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dc I-V characteristics of DNA films under variable relative humidity (RH) were obtained showing an exponential increase in current with increasing RH from 20% to 85%. Protonic conduction was signified in details by the presence of a negative differential resistance (NDR) in highly hydrated films. NDR was seen when RH was over ∼70% at which the full coordination of DNA backbone with water molecules was expected. It is concluded that the protonic conduction is originated from water redox reactions and the NDR is the result of the limited diffusion of water on the surface of DNA molecules.
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Lee et al. (2010) studied this question.
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