Unusual metallic-like transport near the percolation threshold

Bhatia, Ravi; Suchand Sangeeth, C. S.; Prasad, V.; Menon, Reghu
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p242113
Academic Journal
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 [σ(T)∝T0.3] behavior indicates metallic-like behavior, unlike the usual activated transport for systems near the percolation threshold. The low field positive magnetoconductance follows H2 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.


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