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IPM
30
YEARS OLD

“School of Nano-Sciences”

Paper   IPM / Nano-Sciences / 11750
   School of Nano Science
  Title: Computational modelling of carbon nanotube-based DNA nanosensor
  Author(s):
1 . R. Kalantari-Nejad
2 . M. Bahrami
3 . Hashem Rafii Tabar
4 . I. Rungger
5 . S. Sanvito
  Status: Published
  Journal: Nanotech.
  No.: 44
  Vol.: 21
  Year: 2010
  Pages: 8
  Publisher(s): IOP Publishing Ltd
  Supported by: IPM
  Abstract:
During the last decade the design of biosensors, based on quantum transport in one-dimensional nanostructures, has developed as an active area of research. Here we investigate the sensing capabilities of a DNA nanosensor, designed as a semiconductor single walled carbon nanotube (SWCNT) connected to two gold electrodes and functionalized with a DNA strand acting as a bio-receptor probe. In particular, we have considered both covalent and non-covalent bonding between the DNA probe and the SWCNT. The optimized atomic structure of the sensor is computed both before and after the receptor attaches itself to the target, which consists of another DNA strand. The sensor's electrical conductance and transmission coefficients are calculated at the equilibrium geometries via the non-equilibrium Green's function scheme combined with the density functional theory in the linear response limit. We demonstrate a sensing efficiency of 70

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