Graphene quantum point contact transistor for DNA sensing.
Proc Natl Acad Sci U S A
; 110(42): 16748-53, 2013 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-24082108
ABSTRACT
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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Base de dados:
MEDLINE
Assunto principal:
Transistores Eletrônicos
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DNA
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Pontos Quânticos
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Grafite
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Membranas Artificiais
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
2013
Tipo de documento:
Article