Physics – Condensed Matter – Materials Science
Scientific paper
2004-09-03
Physics
Condensed Matter
Materials Science
To be published in Appl. Phys. Lett
Scientific paper
10.1063/1.1794852
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 behaviour of DNA by measuring the localized or delocalized character of 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.
Deresmes Dominique
Heim Thomas
Melin Thierry
Vuillaume Dominique
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