Ultra-low electrical percolation threshold in carbon-nanotube-epoxy composites

被引：1433

作者：

Sandler, JKW ^{[1
]}

Kirk, JE ^{[1
]}

Kinloch, IA ^{[1
]}

Shaffer, MSP ^{[1
]}

Windle, AH ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

POLYMER | 2003年 / 44卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

carbon nanotubes; epoxy matrix; electrical properties;

D O I：

10.1016/S0032-3861(03)00539-1

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Epoxy composites based on aligned CVD-grown multi-wall carbon nanotubes with weight fractions ranging from as low as 0.001 up to 1 wt% were produced. The resulting electrical properties were analysed by AC impedance spectroscopy. The composite conductivity sigma follows a percolation scaling law of the form sigmaproportional to (p - p(c))(/) with the critical mean concentration p(c) to form a conductive network of approximately 0.0025 wt% and an exponent, t, of 1.2. The results are compared to previous studies investigating the percolation behaviour of entangled carbon nanotubes and spherical carbon black particles in the same matrix processed under similar conditions. The experimental percolation threshold for the aligned nanotubes used in this study represents the lowest threshold observed for carbon-nanotube-based polymer composites yet reported. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：5893 / 5899

页数：7

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