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Unusual metallic-like transport near the percolation threshold

Bhatia, Ravi and Sangeeth, CS Suchand and Prasad, V and Menon, Reghu (2010) Unusual metallic-like transport near the percolation threshold. In: Applied Physics Letters, 96 (24).

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Official URL: http://apl.aip.org/applab/v96/i24/p242113_s1


In multiwall carbon nanotube (MWNT)-polystyrene (PS) composites, a weak temperature dependence of conductivity has been observed at a percolation threshold of 0.4 wt %. The power law [sigma(T)proportional to T-0.3] behavior indicates metallic-like behavior, unlike the usual activated transport for systems near the percolation threshold. The low field positive magnetoconductance follows H-2 dependence, due to the weak localization in disordered metallic systems. The marginal metallic nature of MWNT-PS at percolation threshold is further verified from the negligible frequency dependence of conductivity, in the temperature range of 300 to 5 K. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3455895]

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Keywords: carbon nanotubes;electrical conductivity;magnetoresistance; nanocomposites;percolation; polymers
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Jul 2010 10:49
Last Modified: 19 Sep 2010 06:10
URI: http://eprints.iisc.ac.in/id/eprint/28986

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