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Materials 2017, 10(7), 684; doi:10.3390/ma10070684

A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite/Polyurethane Composite Films

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School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China
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Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China
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School of Art and Fashion, Tianjin Polytechnic University, Tianjin 300387, China
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Key Laboratory of Advanced Textile Composite Materials, Ministry of Education of China, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Academic Editor: Dirk Lehmhus
Received: 7 May 2017 / Revised: 5 June 2017 / Accepted: 14 June 2017 / Published: 22 June 2017
View Full-Text   |   Download PDF [5014 KB, uploaded 22 June 2017]   |  

Abstract

A wearable, low-cost, highly repeatable piezoresistive sensor was fabricated by the synthesis of modified-graphite and polyurethane (PU) composites and polydimethylsiloxane (PDMS). Graphite sheets functionalized by using a silane coupling agent (KH550) were distributed in PU/N,N-dimethylformamide (DMF) solution, which were then molded to modified-graphite/PU (MG/PU) composite films. Experimental results show that with increasing modified-graphite content, the tensile strength of the MG/PU films first increased and then decreased, and the elongation at break of the composite films showed a decreasing trend. The electrical conductivity of the composite films can be influenced by filler modification and concentration, and the percolation threshold of MG/PU was 28.03 wt %. Under liner uniaxial compression, the 30 wt % MG/PU composite films exhibited 0.274 kPa−1 piezoresistive sensitivity within the range of low pressure, and possessed better stability and hysteresis. The flexible MG/PU composite piezoresistive sensors have great potential for body motion, wearable devices for human healthcare, and garment pressure testing. View Full-Text
Keywords: modified graphite; polyurethane composite film; mechanical properties; electrical conductivity; piezoresistive sensor modified graphite; polyurethane composite film; mechanical properties; electrical conductivity; piezoresistive sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

He, Y.; Li, W.; Yang, G.; Liu, H.; Lu, J.; Zheng, T.; Li, X. A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite/Polyurethane Composite Films. Materials 2017, 10, 684.

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