Unusual metallic-like transport near the percolation threshold

被引：12

作者：

Bhatia, Ravi ^{[1
]}

Sangeeth, C. S. Suchand ^{[1
]}

Prasad, V. ^{[1
]}

Menon, Reghu ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 24期

关键词：

carbon nanotubes; electrical conductivity; magnetoresistance; nanocomposites; percolation; polymers; CARBON; SEMICONDUCTORS; COMPOSITES; CONDUCTION; FILMS;

D O I：

10.1063/1.3455895

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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]

引用

页数：3

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