Graphene quantum point contact transistor for DNA sensing

Girdhar A.; Sathe C.; Schulten K.Leburton J.-P.

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Graphene quantum point contact transistor for DNA sensing

机译：Graphene quantum point contact transistor for DNA sensing

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By using the nonequilibrium Green's function technique, we show that the shape of the edge, the carrier concentration, and the position and size of a nanopore in graphene nanoribbons can strongly affect its electronic conductance as well as its sensitivity to external charges. This technique, combined with a self-consistent Poisson-Boltzmann formalism to account for ion charge screening in solution, is able to detect the rotational and positional conformation of a DNA strand inside the nanopore. In particular, we show that a graphene membrane with quantum point contact geometry exhibits greater electrical sensitivity than a uniform armchair geometry provided that the carrier concentration is tuned to enhance charge detection. We propose a membrane design that contains an electrical gate in a configuration similar to a field-effect transistor for a graphene-based DNA sensing device.

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来源
《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第42期|16748-16753|共6页
作者
Girdhar A.; Sathe C.; Schulten K.Leburton J.-P.;
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作者单位

Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States;

Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Bio-molecule; Simulation; Solid-state membrane; Transport;

Graphene quantum point contact transistor for DNA sensing

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