TITLE

Localization and delocalization of charges injected in DNA

AUTHOR(S)
Heim, T.; MĂ©lin, T.; Deresmes, D.; Vuillaume, D.
PUB. DATE
September 2004
SOURCE
Applied Physics Letters;9/27/2004, Vol. 85 Issue 13, p2637
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
14546576

 

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