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20 April 2016Alignment of carbon iron into polydimethylsiloxane to create conductive composite with low percolation threshold and high piezoresistivity
With the development of soft materials for applications in flexible tactile sensors, metal particles/insulated polymer
composites have been studied for many years. This article proposes a method to prepare carbon iron particles
(CIPs)/polydimethylsiloxane (PDMS) conductive composite with low percolation threshold and highly piezoresistive
stain sensitivity. CIPs-PDMS composites with various filler volume fraction were cured under a magnetic field over 1.0
T to create chain-like structure resulting in anisotropy of conductive materials. The electrical resistivity for the
longitudinal direction were measured as a function of filler volume fraction to understand the electrical percolation
behavior. In this study, the percolation threshold of CIPs-PDMS composite cured under a magnetic field can be as low as
0.1 vol.%, which is much less than most of those studies in particulate composites. Meanwhile, the effects of
compressive strain on the electrical properties of CIPs-PDMS composites were also investigated. The strain sensitivity
depends on filler volume fraction and decreases with the increasing of compressive strain. It has been found that the
composites containing a small amount of CI particles curing under a magnetic field exhibit a high strain sensitivity of
over 150. The microstructures were measured by using a scanning electron microscope (SEM), and the results were also
reported in this paper.
Shuai Dong,R. Wang, andXiaojie Wang
"Alignment of carbon iron into polydimethylsiloxane to create conductive composite with low percolation threshold and high piezoresistivity", Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98031A (20 April 2016); https://doi.org/10.1117/12.2218132
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Shuai Dong, R. Wang, Xiaojie Wang, "Alignment of carbon iron into polydimethylsiloxane to create conductive composite with low percolation threshold and high piezoresistivity," Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98031A (20 April 2016); https://doi.org/10.1117/12.2218132