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Charge transport in conducting polymers and carbon nanotubes: a comparison

Menon, Reghu and Mukherjee, AK (2003) Charge transport in conducting polymers and carbon nanotubes: a comparison. In: Electronic and Optical Properties of Conjugated Molecular Systems in Condensed Phases . pp. 287-306.

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Abstract

The structure, morphol. and charge transport properties of metallic conducting polymers and carbon nanotube mats are compared in this chapter. In both types of disordered quasi-one dimensional systems the phys. properties show some common features. The pos. temp. coeff. of resistivity above 100 K, neg. dielec. const. at GHz frequencies, the weak localization contribution to magnetoconductance and the quasi-linear temp. dependence of thermopower indicate the metallic nature of these systems. However, the presence of disorder and weak inter-chain/tube interactions localizes a large no. of charge carriers, as shown by the high frequency cond. data. The field and temp. dependence of magnetoconductance is consistent with the localization-interaction model for disordered metallic systems. The temp. dependence of thermopower in carbon nanotube mat has contributions from both metallic and semiconducting tubes; whereas the metallic contribution dominates in case of conducting polymers. The phonon contribution to thermal cond. dominates in both systems. Hence, the charge transport in metallic conducting polymers and carbon nanotubes has quite some resemblance with subtle variations.

Item Type: Journal Article
Additional Information: The Copyright belongs to Research Signpost.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 07 Apr 2006
Last Modified: 27 Aug 2008 11:51
URI: http://eprints.iisc.ernet.in/id/eprint/6195

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