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Enhanced DNA Sequencing Performance Through Edge-Hydrogenation of Graphene Electrodes
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2011 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 21, no 14, 2674-2679 p.Article in journal (Refereed) Published
Abstract [en]

The use of graphene electrodes with hydrogenated edges for solid-state nanopore-based DNA sequencing is proposed, and molecular dynamics simulations in conjunction with electronic transport calculations are performed to explore the potential merits of this idea. The results of the investigation show that, compared to the unhydrogenated system, edge-hydrogenated graphene electrodes facilitate the temporary formation of H-bonds with suitable atomic sites in the translocating DNA molecule. As a consequence, the average conductivity is drastically raised by about 3 orders of magnitude while exhibiting significantly reduced statistical variance. Furthermore, the effect of the distance between opposing electrodes is investigated and two regimes identified: for narrow electrode separation, the mere hindrance due to the presence of protruding hydrogen atoms in the nanopore is deemed more important, while for wider electrode separation, the formation of H-bonds becomes the dominant effect. Based on these findings, it is concluded that hydrogenation of graphene electrode edges represents a promising approach to reduce the translocation speed of DNA through the nanopore and substantially improve the accuracy of the measurement process for whole-genome sequencing.

Place, publisher, year, edition, pages
2011. Vol. 21, no 14, 2674-2679 p.
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-38959DOI: 10.1002/adfm.201002530ISI: 000293715800008ScopusID: 2-s2.0-79960491374OAI: diva2:438908
Swedish Research Council, 621-2009-3628
Available from: 2011-09-06 Created: 2011-09-05 Last updated: 2011-09-06Bibliographically approved

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Ahuja, Rajeev
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