Localization and delocalization of charges injected in DNA

Heim, T.; MĂ©lin, T.; Deresmes, D.; Vuillaume, D.
September 2004
Applied Physics Letters;9/27/2004, Vol. 85 Issue 13, p2637
Academic Journal
The electrical properties of DNA molecules are investigated by charge injection and electric force microscopy experiments. Prior to injection, DNA molecules exhibit a weak positively charged state. We probe the electrical behavior of DNA by measuring the localized or delocalized character o f the DNA charge states upon injection of excess charges. We show that injected charges do not delocalize for overstretched DNA prepared by a receding meniscus technique, while the adjunction of spermidine during the deposition leads to relaxed DNA molecules exhibiting a charge delocalization over microns. The interplay between charge localization/delocalization and deposition techniques may explain that transport behaviors ranging from insulating to conductive have been reported for DNA deposited on surfaces.


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