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The diffusion of carbon atoms inside carbon nanotubes

Gan, Yanjie and Kotakoski, J. and Krasheninnikov, A. V. and Nordlund, K. and Banhart, F. (2008):
The diffusion of carbon atoms inside carbon nanotubes.
In: New J. Phys., IOP Publishing, pp. 023022-1, 10, [Online-Edition: http://iopscience.iop.org/1367-2630/10/2/023022/],
[Article]

Abstract

We combine electron irradiation experiments in a transmission electron microscope with kinetic Monte Carlo simulations to determine the mobility of interstitial carbon atoms in single-walled carbon nanotubes. We measure the irradiation dose necessary to cut nanotubes repeatedly with a focused electron beam as a function of the separation between the cuts and at different temperatures. As the cutting speed is related to the migration of displaced carbon atoms trapped inside the tube and to their recombination with vacancies, we obtain information about the mobility of the trapped atoms and estimate their migration barrier to be about 0.25 eV. This is an experimental confirmation of the remarkably high mobility of interstitial atoms inside carbon nanotubes, which shows that nanotubes have potential applications as pipelines for the transport of carbon atoms.

Item Type: Article
Erschienen: 2008
Creators: Gan, Yanjie and Kotakoski, J. and Krasheninnikov, A. V. and Nordlund, K. and Banhart, F.
Title: The diffusion of carbon atoms inside carbon nanotubes
Language: English
Abstract:

We combine electron irradiation experiments in a transmission electron microscope with kinetic Monte Carlo simulations to determine the mobility of interstitial carbon atoms in single-walled carbon nanotubes. We measure the irradiation dose necessary to cut nanotubes repeatedly with a focused electron beam as a function of the separation between the cuts and at different temperatures. As the cutting speed is related to the migration of displaced carbon atoms trapped inside the tube and to their recombination with vacancies, we obtain information about the mobility of the trapped atoms and estimate their migration barrier to be about 0.25 eV. This is an experimental confirmation of the remarkably high mobility of interstitial atoms inside carbon nanotubes, which shows that nanotubes have potential applications as pipelines for the transport of carbon atoms.

Journal or Publication Title: New J. Phys.
Volume: 10
Publisher: IOP Publishing
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: 28 Feb 2012 15:17
Official URL: http://iopscience.iop.org/1367-2630/10/2/023022/
Identification Number: doi:10.1088/1367-2630/10/2/023022
Related URLs:
Funders: We thank the DAAD and ETC for an exchange grant (D/05/51651) and the Academy of Finland for support through several projects and the Centre of Excellence programme., We are also indebted to the Finnish Center for Scientific Computing for generous grants of computer time.
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