Tunneling effect in a polymer/carbon nanotube nanocomposite strain sensor

被引：850

作者：

Hu, Ning ^{[1
]}

Karube, Yoshifumi ^{[1
]}

Yan, Cheng ^{[2
]}

Masuda, Zen ^{[1
]}

Fukunaga, Hisao ^{[1
]}

机构：

[1] Tohoku Univ, Dept Aerosp Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Queensland Univ Technol, Sch Engn Syst, Brisbane, Qld 4001, Australia

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 13期

关键词：

nanocomposite; polymer matrix composites; Monte Carlo techniques; electrical resistivity/conductivity;

D O I：

10.1016/j.actamat.2008.02.030

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A strain sensor has been fabricated from a polymer nanocomposite with multiwalled carbon nanotube (MWNT) fillers. The piezoresistivity of this nanocomposite strain sensor has been investigated based on an improved three-dimensional (313) statistical resistor network model incorporating the tunneling effect between the neighboring carbon nanotubes (CNTs), and a fiber reorientation model. The numerical results agree very well with the experimental measurements. As compared with traditional strain gauges, much higher sensitivity can be obtained in the nanocomposite sensors when the volume fraction of CNT is close to the percolation threshold. For a small CNT volume fraction, weak nonlinear piezoresistivity is observed both experimentally and from numerical simulation. The tunneling effect is considered to be the principal mechanism of the sensor under small strains. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2929 / 2936

页数：8

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