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Electrical transport properties of graphite sheets doped polyvinylidene fluoride nanocomposites

Published online by Cambridge University Press:  31 January 2011

Yu Chao Li ,
Robert Kowk Yiu Li  and
Sie Chin Tjong
Sie Chin Tjong*
Affiliation:
Physics and Materials Science, City University of Hong Kong, Kowloon Town, Hong Kong
*
a)Address all correspondence to this author. e-mail: aptjong@cityu.edu.hk
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Abstract

Graphite nanosheets (GNs) were introduced into polyvinylidene fluoride (PVDF) via the solution mixing technique. The nanocomposites were then subjected to compression molding for electrical measurements. Solution mixing enabled homogeneous dispersion of GN within the PVDF matrix. The electrical transport behavior of such nanocomposites was studied by means of the impedance spectroscopy in a wide frequency range from 102 to 107 Hz. The results showed that the permittivity and conductivity of the composites are frequency dependent and well obeyed with the scaling law (ε′ ∝ ωu and σ′ ∝ ω−v) in the vicinity of percolation threshold (Φc ≈ 2.5 wt%). A large dielectric constant of 173 was observed in the PVDF/GN 2.5 wt% composites at 1 kHz.

Keywords

Dielectric propertiesElectrical propertiesEnergy storage
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 8: Materials for Electrical Energy Storage , August 2010 , pp. 1645 - 1648
Copyright
Copyright © Materials Research Society 2010

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