期刊
APPLIED PHYSICS LETTERS
卷 96, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3455895
关键词
carbon nanotubes; electrical conductivity; magnetoresistance; nanocomposites; percolation; polymers
资金
- CSIR, New Delhi
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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