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Electrical conductivity of polyvinylidene fluoride nanocomposites filled with carbon nanotubes and nanofibers

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2 Author(s)
Lin-Xiang He ; Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong ; Sie-Chin Tjong

Polyvinylidene fluoride (PVDF) nanocomposites filled with low loading levels of pristine multiwalled carbon nanotubes (MWNTs), carboxyl functionalized MWNTs (FMWNTs) and vapor grown carbon nanofibers (VGCNFs) were prepared by a versatile coagulation method. The ac electrical conductivity of the composites was investigated in the frequency range 40-12 MHz. The frequency dependence of the conductivity can can be described the universal dynamic response. A dc plateau followed by the frequency dependence regime was observed. The dc conductivity obeyed a percolation scaling law. The percolation thresholds of VGCNF-PVDF, MWNT-PVDF and FMWNT-PVDF were determined to be 1.46, 1.0 and 0.98 vol%, respectively. Moreover, percolative nanocomposites exhibited non-linear I-V characteristics, demonstrating the presence of tunneling conduction.

Published in:

2010 3rd International Nanoelectronics Conference (INEC)

Date of Conference:

3-8 Jan. 2010