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Charge transport in l-DNA probed by conducting-AFM, and relationship with its structure

Abstract : We studied the electrical conductivity of DNA samples as function of the number of DNA molecules. We showed that the insulating gap (no current at low voltage) increases from ~1-2 V for bundles and large ropes to ~4-7 V for few DNA molecules. From the distance dependent variation of the current, a unique hopping distance of ~3 nm is calculated (polaron-hopping model) independently of the number of DNA in the sample. The highly resistive behavior of the single DNA is correlated with its flattened conformation on the surface (reduced thickness, ~0.5-1.5 nm, compared to its nominal value, ~2 nm).
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https://hal.archives-ouvertes.fr/hal-00000703
Contributor : Dominique Vuillaume Connect in order to contact the contributor
Submitted on : Friday, October 10, 2003 - 3:06:41 PM
Last modification on : Tuesday, October 19, 2021 - 6:37:45 PM
Long-term archiving on: : Monday, March 29, 2010 - 5:00:41 PM

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Thomas Heim, Dominique Deresemes, Dominique Vuillaume. Charge transport in l-DNA probed by conducting-AFM, and relationship with its structure. 2003. ⟨hal-00000703⟩

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