Abstract
The strain-dependent electrical resistance characteristics of multi-walled carbon nanotube(MWCNT)/polymer composite films were investigated. In this research, polyethylene oxide(PEO) is used as the polymer matrix. Two representative volume fractions ofMWCNT/PEO composite films were selected: 0.56 vol% (near the percolation threshold)and 1.44 vol% (away from the percolation threshold) of MWCNT. An experimental setupwhich can measure electrical resistance and strain simultaneously and continuously hasbeen developed. Unique and repeatable relationships in resistance versus strain wereobtained for multiple specimens with different volume fractions of MWCNT. The overallpattern of electrical resistance change versus strain for the specimens tested consists oflinear and nonlinear regions. A resistance change model to describe the combination oflinear and nonlinear modes of electrical resistance change as a function of strain issuggested. The unique characteristics in electrical resistance change for differentvolume fractions imply that MWCNT/PEO composite films can be used as tunablestrain sensors and for application into embedded sensor systems in structures.
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