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The role of water on the electronic transport in graphene nanogap devices designed for DNA sequencing
Sao Paulo State Univ UNESP, Inst Theoret Phys, Campus Sao Paulo, Sao Paulo, Brazil;Univ Sao Paulo, Inst Phys, Sao Paulo, SP, Brazil.
Univ Fed Fluminense, Dept Fis, ICEx, Volta Redonda, RJ, Brazil.
Sao Paulo State Univ UNESP, Inst Chem, Campus Araraquara, Araraquara, SP, Brazil.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0001-5397-7753
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2020 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 158, p. 314-319Article in journal (Refereed) Published
Abstract [en]

Innovative methodologies for reliably and inexpensively sequencing DNA can lead to a new era of personalized medicine. In this work, we performed a theoretical investigation of a nanogap-based all electronic DNA sequencing device. To do so, we used a nitrogen-terminated nanogap on a graphene sheet with the aqueous environment fully taken into account. Our investigation is performed using a hybrid methodology combining quantum and classical mechanics coupled to non-equilibrium Green's functions for solving the electron transport across the device. The obtained results show that the DNA nucleotides can be both detected and distinguished in such a device, which indicates that it can be used as a DNA sequencing device providing very high sensitivity and selectivity. Furthermore, our results show that water plays a major role in electronic transport in nanoscopic tunneling devices, not only from an electrostatics point of view, but also by providing states that significantly increase the conductance in nanogap-based DNA sequencing devices.

Place, publisher, year, edition, pages
2020. Vol. 158, p. 314-319
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-407444DOI: 10.1016/j.carbon.2019.10.067ISI: 000512995800032OAI: oai:DiVA.org:uu-407444DiVA, id: diva2:1416762
Funder
Swedish Research Council, 2017-04627Available from: 2020-03-25 Created: 2020-03-25 Last updated: 2020-03-25Bibliographically approved

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Scheicher, Ralph H.

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