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Charge transport in functionalized multi-wall carbon nanotube-Nafion composite

Sangeeth, Suchand CS and Kannan, R and Pillai, Vijayamohanan K and Menon, Reghu (2012) Charge transport in functionalized multi-wall carbon nanotube-Nafion composite. In: Journal of Applied Physics, 112 .

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Official URL: http://dx.doi.org/10.1063/1.4749264

Abstract

The charge transport in sulfonated multi-wall carbon nanotube (sMWNT)-Nafion composite is reported. The scanning electron microscope images of the composite, at 1 and 10 wt % of sMWNT, show that the nanotubes are well dispersed in polymer matrix, with conductivity values of 0.005 and 3.2 S/cm, respectively; and the percolation threshold is nearly 0.42 wt. %. The exponent (∼0.25) of the temperature dependence of conductivity in both samples indicates Mott's variable range hopping (VRH) transport. The conductance in 1 wt. % sample increases by three orders of magnitude at high electric-fields, consistent with VRH model. The negative magnetoresistance in 10 wt. % sample is attributed to the forward interference scattering mechanism in VRH transport. The ac conductance in 1 wt. % sample is expressed by σ(ω)∝ωs, and the temperature dependence of s follows the correlated barrier hopping model.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the American Institute of Physics
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 29 Oct 2012 09:18
Last Modified: 08 Nov 2012 07:21
URI: http://eprints.iisc.ernet.in/id/eprint/45244

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