High Electronic Conductance through Double-Helix DNA Molecules with Fullerene Anchoring Groups
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- 作者：Kathia L. Jiménez-Monroy ; Nicolas Renaud ; Jeroen Drijkoningen ; David Cortens ; Koen Schouteden ; Christian van Haesendonck ; Wanda J. Guedens ; Jean V. Manca ; Laurens D. A. SiebbelesFerdinand C. Grozema ; Patrick H. Wagner
- 刊名：Journal of Physical Chemistry A
- 出版年：2017
- 出版时间：February 16, 2017
- 年：2017
- 卷：121
- 期：6
- 页码：1182-1188
- 全文大小：453K
- ISSN：1520-5215
文摘
Determining the mechanism of charge transport through native DNA remains a challenge as different factors such as measuring conditions, molecule conformations, and choice of technique can significantly affect the final results. In this contribution, we have used a new approach to measure current flowing through isolated double-stranded DNA molecules, using fullerene groups to anchor the DNA to a gold substrate. Measurements were performed at room temperature in an inert environment using a conductive AFM technique. It is shown that the π-stacked B-DNA structure is conserved on depositing the DNA. As a result, currents in the nanoampere range were obtained for voltages ranging between ±1 V. These experimental results are supported by a theoretical model that suggests that a multistep hopping mechanism between delocalized domains is responsible for the long-range current flow through this specific type of DNA.