Journal
PHYSICA B-CONDENSED MATTER
Volume 407, Issue 4, Pages 759-764Publisher
ELSEVIER
DOI: 10.1016/j.physb.2011.12.019
Keywords
Nanocomposites; Impedance; ac conductivity; Dielectric constant; Electrical percolation
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Funding
- Hashemite University
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The dielectric behavior of polymethyl methacrylate/multi-walled carbon nanocomposites (PMMA/MWCNTs) was investigated using impedance spectroscopy technique. The composites were prepared using melt mixing with MWCNTs loading ranging from 0.01 to 10 wt%. The experimental results showed that the measured impedance reflects the insulating behavior of the host material (PMMA) with no appreciable effects of the filler less than 8.5 wt%. However, for the sample containing 10 wt%, the calculated value of dc conductivity increases with increasing temperature from 2.0 x 10(-6) (Omega m)(-1) to attain a value of 4.8 x 10(-6) (Omega m)(-1) at 110 degrees C. The percolation threshold derived from the dielectric data was estimated to be higher than 8.5 wt% and lower than 10 wt%. A temperature dependent electrical relaxation phenomenon was only observed in the sample containing 10 wt% of MWCNTs. The frequency dependence of the ac conductivity data followed a power law. (C) 2011 Elsevier B.V. All rights reserved.
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