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Boosting DNA Recognition Sensitivity of Graphene Nanogaps through Nitrogen Edge Functionalization
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Univ Fed Fluminense, Dept Fis, ICEx, Volta Redonda, RJ, Brazil..
Univ Estadual Paulista, UNESP, Inst Fis Teor, Sao Paulo, Brazil..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2016 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 34, 19384-19388 p.Article in journal (Refereed) Published
Abstract [en]

One of the challenges for next generation DNA sequencing is to have a robust, stable, and reproducible nanodevice. In this work, we propose how to improve the sensing of DNA nucleobase using functionalized graphene nanogap as a solid state device. Two types of edge functionalization, namely, either hydrogen or nitrogen, were considered. We showed that, independent of species involved in the edge passivation, the highest-to-lowest order of the nucleobase transmissions is not altered, but the intensity is affected by several orders of magnitude. Our results show that nitrogen edge tends to p-dope graphene, and most importantly, it contributes with resonance states close to the Fermi level, which can be associated with the increased conductance. Finally, the translocation process of nucleobases passing through the nanogap was also investigated by varying their position from a certain height (from +3 to -3 angstrom) with respect to the graphene sheet to show that nitrogen-terminated sheets have enhanced sensitivity, as moving the nucleobase by approximately 1 angstrom reduces the conductance by up to 3 orders of magnitude.

Place, publisher, year, edition, pages
2016. Vol. 120, no 34, 19384-19388 p.
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-304178DOI: 10.1021/acs.jpcc.6b04683ISI: 000382596900049OAI: oai:DiVA.org:uu-304178DiVA: diva2:1010274
Funder
Carl Tryggers foundation Swedish Research Council
Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-30Bibliographically approved

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