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Probing the inter-tube transport in aligned and random multiwall carbon nanotubes

Bhatia, Ravi and Prasad, V and Menon, Reghu (2011) Probing the inter-tube transport in aligned and random multiwall carbon nanotubes. In: Journal of Applied Physics, 109 (5).

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The temperature and magnetic field dependence of conductivity has been used to probe the inter-tube transport in multiwall carbon nanotubes (MWNTs). The scanning electron microscopy images show highly aligned and random distribution of MWNTs. The conductivity in aligned carbon nanotube (ACNT) and random carbon nanotube (RCNT) samples at low temperature follows T-1/2 (at T < 8 K) and T-3/4 (at T > 8 K) dependence in accordance with the weak localization and electron-electron (e-e) interaction model. The values of diffusion coefficient in ACNT and RCNT are 0.25 x 10(-2) and 0.71 x 10(-2) cm(2) s(-1), respectively, indicating that larger number of inter-tube junctions in later enhances the bulk transport. The positive magnetoconductance (MC) data in both samples show that the weak localization contribution is dominant. However, the saturation of MC at higher fields and lower temperatures indicate that e-e interaction is quite significant in RCNT. The T-3/4 and T-1/2 dependence of inelastic scattering length (l(in)) in ACNT and RCNT samples show that the inelastic e-e scattering is more important in aligned tubes. (C) 2011 American Institute of Physics. doi:10.1063/1.3552911]

Item Type: Journal Article
Publication: Journal of Applied Physics
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Keywords: carbon nanotubes;diffusion;electrical conductivity;magnetoresistance;scanning electron microscopy; weak localisation
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 08 Apr 2011 07:28
Last Modified: 08 Apr 2011 07:28
URI: http://eprints.iisc.ac.in/id/eprint/36575

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