Nano Archive

DNA-wrapped carbon nanotubes

Enyashin, Andrey N. and Gemming, S and Seifert, G (2007) DNA-wrapped carbon nanotubes. Nanotechnology, 18 (24). 245702 (10pp).

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Official URL: http://stacks.iop.org/0957-4484/18/245702

Abstract

The stability and electronic properties of complexes of single-walled carbon nanotubes wrapped by homopolymeric single-stranded DNA molecules (CNT@DNA) are considered using a quantum mechanical density-functional tight-binding method (DFTB). A phenomenological model of the CNT@DNA formation energy depending on the nanotube radii is developed, which shows that the decoration of a CNT by a few DNA chains leads to a high water solubility of CNT@DNA. Pyrimidine-based DNAs are found to be more effective to wrap the CNTs than other DNAs. The densities of states of the CNT@DNA complexes are close to the superposition of those of the 'free' components with some additional states below the Fermi level. The band gap in a hybrid CNT@DNA system is determined by the competition between the Fermi levels of the 'free' DNA and CNT. In a few specific cases a considerable charge transfer from the DNA to the CNT was observed, combined with an additional gain in the CNT@DNA formation energy.

Item Type:Article
ID Code:647
Deposited By:Prof. Alexey Ivanov
Deposited On:16 Mar 2009 10:41
Last Modified:26 Mar 2009 14:24

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