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Magnetotransport in doped polyaniline

Mukherjee, AK and Menon, Reghu (2005) Magnetotransport in doped polyaniline. In: Journal of Physics: Condensed Matter, 17 (12). pp. 1947-1960.

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Abstract

Conductivity and magnetotransport studies have been carried out in polyaniline (PANI) doped with 2-acryloamido-2-methyl-1-propane sulfonic acid (AMPSA), camphor sulfonic acid (CSA) and dodecylbenzene sulfonic acid (DBSA). Both PANI-AMPSA and PANI-CSA show a metallic positive temperature coefficient of resistivity above 150 K, and the data down to 1.6 K show that the systems are near the critical regime of metal–insulator (M–I) transition, whereas PANI-DBSA shows hopping transport. The magnetoconductance (MC) in PANI-AMPSA is positive (negative) in transverse (longitudinal) directions. The anisotropic MC in PANI-AMPSA is due to the interplay of contributions from weak localizations, electron–electron interactions and hopping transport. This suggests the presence of local molecular-scale quasi-two dimensional (q-2D) ordered regions in PANIAMPSA, which are absent in the other two systems. The MC is weakly (strongly) negative in PANI-CSA (PANI-DBSA). The data analysis yields consistent values for various length scales (e.g., inelastic scattering length, localization length, etc) according to this model. These results indicate that the surfactant counterion plays a major role in local molecular-scale ordering and charge transport properties in doped PANI.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 May 2007
Last Modified: 19 Sep 2010 04:37
URI: http://eprints.iisc.ernet.in/id/eprint/10800

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