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Applied Physics Letters / Volume 88 / Issue 10 / ELECTRONIC TRANSPORT AND SEMICONDUCTORS

Appl. Phys. Lett. 88, 102102 (2006); http://dx.doi.org/10.1063/1.2182027 (3 pages)

Conductivity of single-stranded and double-stranded deoxyribose nucleic acid under ambient conditions: The dominance of water

T. Kleine-Ostmann1, C. Jördens1, K. Baaske1, T. Weimann2, M. Hrabe de Angelis3, and M. Koch1

1Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Schleinitzstraße 22, 38106 Braunschweig, Germany
2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
3Institute of Experimental Genetics, GSF National Research Center for Environment and Health, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany

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(Received 8 November 2005; accepted 23 January 2006; published online 6 March 2006)

We investigate the conductivity of single-stranded and double-stranded herring deoxyribose nucleic acid (DNA) in buffer solution spotted and dried on Au nanocontacts. We find an exponential increase of the conductivity with increasing humidity that is identical for single- and double-stranded DNA within the measurement accuracy. While the small conductivity of dry DNA is comparable to that of a large band-gap semiconductor, we attribute the increase at high humidity levels to water molecules accumulated at the phosphate backbone. For high humidities we observe s-shaped current-voltage characteristics that can be well explained by the dissociation of water attached to the DNA molecules.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

DNA, molecular biophysics, bioelectric potentials, dissociation, biochemistry

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2182027

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    S. Tuukkanen, A. Kuzyk, J. J. Toppari, V. P. Hytönen, T. Ihalainen, and P. Törmä, Appl. Phys. Lett. 87, 183102 (2005)APPLAB000087000018183102000001.


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