期刊
ADVANCED THEORY AND SIMULATIONS
卷 2, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adts.201800125
关键词
percolation theory; piezoresistive response; piezoresistivity; polymer composite; pressure sensor
资金
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- NASA Space Technology Research Fellowship
Insulating polymer composites with conductive filler particles are attractive for sensor applications due to their large piezoresistive response. Composite samples composed of a polymer matrix filled with particles of doped semiconductor that gives a piezoresistive response that is 10(5) times larger than that of bulk semiconductor sensors are prepared here. The piezoresistance of such composite materials is typically described by using a tunneling mechanism. However, it is found that a percolation description not only fits prior data better but provides a much simpler physical mechanism for the more flexible and soft polymer composite prepared and tested in this study. A simple model for the resistance as a function of applied pressure is derived using percolation theory with a conductivity exponent, s. The model is shown to fit experimental piezoresistive trends with the resistance measured both perpendicular and parallel to the pressure direction.
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