Tunneling effect in a polymer/carbon nanotube nanocomposite strain sensor

Hu, Ning, Karube, Yoshifumi, Yan, Cheng, Masuda, Zen, & Fukunaga, Hisao (2008) Tunneling effect in a polymer/carbon nanotube nanocomposite strain sensor. Acta Materialia, 56(13), pp. 2929-2936.

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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 (3D) 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.

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ID Code: 18477
Item Type: Journal Article
Refereed: Yes
Keywords: Nanocomposite, Polymer matrix composites, Monte Carlo techniques, Electrical conductivity
DOI: 10.1016/j.actamat.2008.02.030
ISSN: 1359-6454
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2008 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher
Deposited On: 05 Mar 2009 00:44
Last Modified: 29 Feb 2012 13:46

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