Tuning the conductance of single-walled carbon nanotubes by ion irradiation in the Anderson localization regime

Nature Materials 4, 534 - 539 (2005)

Tuning the conductance of single-walled carbon nanotubes by ion irradiation in the Anderson localization regime

C. Gómez-Navarro, P.J. de Pablo, J.Gómez-Herrero, B.Biel, F.J.Garcia-Vidal, A.Rubio, F. Flores

Consecutive Ar+ irradiation doses were applied to single-walled nanotubes producing a uniform density of defects. After each dose, the resistance versus the length along the nanotube was measured by using conductive atomic force microscopy. Our data showed an exponential dependence on the resistance-length indicating strong Anderson localization. Simulations demonstrated that mainly di-vacancies contributed to the exponential conductance drop induced by irradiation, showing that the localization length is a linear function of the di-vacancies mean distance. By comparing experiments and theory, we conclude that 1 out of 4 Ar+ ions created one di-vacancy and that a 0.03% of di-vacancies produced an increase of three orders of magnitude in the resistance of a 400 nm nanotube

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http://dx.doi.org/10.1038/nmat1414

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