Open AccessCharge transport in functionalized multi-wall carbon nanotube-Nafion composite
Author(s) -
C. S. Suchand Sangeeth,
Kannan Ramaiyan,
Vijayamohanan K. Pillai,
Reghu Me
Publication year - 2012
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.4749264
Subject(s) - variable range hopping , carbon nanotube , materials science , nafion , conductance , percolation (cognitive psychology) , percolation threshold , composite number , magnetoresistance , conductivity , scanning electron microscope , charge carrier , scattering , composite material , condensed matter physics , electrical resistivity and conductivity , thermal conduction , chemistry , magnetic field , electrode , electrochemistry , physics , optics , optoelectronics , neuroscience , quantum mechanics , biology
The charge transport in sulfonated multi-wall carbon nanotube (sMWNT)-Nafion composite is reported. The scanning electron microscope images of the composite, at 1 and 10 wt % of sMWNT, show that the nanotubes are well dispersed in polymer matrix, with conductivity values of 0.005 and 3.2 S/cm, respectively; and the percolation threshold is nearly 0.42 wt. %. The exponent (∼0.25) of the temperature dependence of conductivity in both samples indicates Mott's variable range hopping (VRH) transport. The conductance in 1 wt. % sample increases by three orders of magnitude at high electric-fields, consistent with VRH model. The negative magnetoresistance in 10 wt. % sample is attributed to the forward interference scattering mechanism in VRH transport. The ac conductance in 1 wt. % sample is expressed by σ(ω)∝ωs, and the temperature dependence of s follows the correlated barrier hopping model
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