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Relative abundance of single and double vacancies in irradiated single-walled carbon nanotubes

Tolvanen, A. and Kotakoski, J. and Krasheninnikov, A. V. and Nordlund, K. (2007):
Relative abundance of single and double vacancies in irradiated single-walled carbon nanotubes.
In: Appl. Phys. Lett., American Institute of Physics, p. 173109, 91, (17), ISSN 0003-6951,
[Online-Edition: http://apps.webofknowledge.com/full_record.do?product=UA&sea...],
[Article]

Abstract

Double and single vacancies differently affect the conductance of carbon nanotubes {\}G. Gomez-Navarro et al., Nat. Mater. 4, 534 (2005), so that the exact knowledge of the abundance of these defects is mandatory for an unambiguous interpretation of irradiation-induced changes in nanotube conductance. We calculate concentrations of defects produced by Ar ions using the molecular dynamics method combined with kinetic Monte Carlo simulations. Carefully taking into account the annealing of defects, we show that the ratio of single to double vacancies has a minimum at ion energies of about 0.5 keV and that the ratio saturates toward a constant value at high ion energies. (C) 2007 American Institute of Physics.

Item Type: Article
Erschienen: 2007
Creators: Tolvanen, A. and Kotakoski, J. and Krasheninnikov, A. V. and Nordlund, K.
Title: Relative abundance of single and double vacancies in irradiated single-walled carbon nanotubes
Language: English
Abstract:

Double and single vacancies differently affect the conductance of carbon nanotubes {\}G. Gomez-Navarro et al., Nat. Mater. 4, 534 (2005), so that the exact knowledge of the abundance of these defects is mandatory for an unambiguous interpretation of irradiation-induced changes in nanotube conductance. We calculate concentrations of defects produced by Ar ions using the molecular dynamics method combined with kinetic Monte Carlo simulations. Carefully taking into account the annealing of defects, we show that the ratio of single to double vacancies has a minimum at ion energies of about 0.5 keV and that the ratio saturates toward a constant value at high ion energies. (C) 2007 American Institute of Physics.

Journal or Publication Title: Appl. Phys. Lett.
Volume: 91
Number: 17
Publisher: American Institute of Physics
Uncontrolled Keywords: argon, carbon nanotubes, electrical conductivity, ion beam effects, molecular dynamics method, Monte Carlo methods, vacancies (crystal)
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Feb 2012 16:23
Official URL: http://apps.webofknowledge.com/full_record.do?product=UA&sea...
Identification Number: doi:10.1063/1.2800807
Funders: We would like to thank the Academy of Finland for the support of the research described in this article through the Centres of Excellence Programme and the Finnish Center for Scientific Computing for generous grants of computer time.
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