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Sensors 2011, 11(11), 10691-10723; doi:10.3390/s111110691

Piezoresistive Strain Sensors Made from Carbon Nanotubes Based Polymer Nanocomposites

1,* , 2
1 Department of Mechanical Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan 2 Department of Aerospace Engineering, Tohoku University, Aramaki-Aza-Aoba 6-6-01, Aoba-ku, Sendai 980-8579, Japan
* Author to whom correspondence should be addressed.
Received: 9 October 2011 / Revised: 5 November 2011 / Accepted: 7 November 2011 / Published: 11 November 2011
(This article belongs to the Section Physical Sensors)


In recent years, nanocomposites based on various nano-scale carbon fillers, such as carbon nanotubes (CNTs), are increasingly being thought of as a realistic alternative to conventional smart materials, largely due to their superior electrical properties. Great interest has been generated in building highly sensitive strain sensors with these new nanocomposites. This article reviews the recent significant developments in the field of highly sensitive strain sensors made from CNT/polymer nanocomposites. We focus on the following two topics: electrical conductivity and piezoresistivity of CNT/polymer nanocomposites, and the relationship between them by considering the internal conductive network formed by CNTs, tunneling effect, aspect ratio and piezoresistivity of CNTs themselves, etc. Many recent experimental, theoretical and numerical studies in this field are described in detail to uncover the working mechanisms of this new type of strain sensors and to demonstrate some possible key factors for improving the sensor sensitivity.
Keywords: carbon nanotubes; nanocomposites; strain sensor; piezoresistivity carbon nanotubes; nanocomposites; strain sensor; piezoresistivity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Alamusi; Hu, N.; Fukunaga, H.; Atobe, S.; Liu, Y.; Li, J. Piezoresistive Strain Sensors Made from Carbon Nanotubes Based Polymer Nanocomposites. Sensors 2011, 11, 10691-10723.

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