Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3455895
Keywords
carbon nanotubes; electrical conductivity; magnetoresistance; nanocomposites; percolation; polymers
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Funding
- CSIR, New Delhi
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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]
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