The electronic transport properties and microstructure of carbon nanofiber/epoxy composites

被引:118
作者
Allaoui, A. [1 ]
Hoa, S. V. [1 ]
Pugh, M. D. [1 ]
机构
[1] Concordia Univ, Dept Mech & Ind Engn, Concordia Ctr Composites, Montreal, PQ H3G 2W1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
polymer-matrix composites; carbon nanofibers; electrical properties; microstructure; impedance spectroscopy;
D O I
10.1016/j.compscitech.2007.06.028
中图分类号
TB33 [复合材料];
学科分类号
摘要
Carbon nanofibers (CNF) were dispersed into an epoxy resin using a combination of ultrasonication and mechanical mixing. The electronic transport properties of the resulting composites were investigated by means of impedance spectroscopy. It was found that a very low critical weight fraction (p(c) = 0.064 wt%) which may be taken to correspond to the formation of a tunneling conductive network inside the matrix. The insulator-to-conductor transition region spanned about one order of magnitude from 0.1 to 1 wt%. Far from the transition, the conductivity increased by two orders of magnitude. This increase and the low value of the conductivity were explained in terms of the presence of an epoxy film at the contact between CNF. A simple model based on the CNF-CNF contact network inside the matrix was proposed in order to evaluate the thickness of that film. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:410 / 416
页数:7
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