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Sensors 2018, 18(5), 1338; https://doi.org/10.3390/s18051338

Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube/Polymer Composites for Human Monitoring

1,2,3
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1
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1
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1
,
1
,
4
,
1,2
and
1,3,*
1
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China
2
School of Fashion and Art, Tianjin Polytechnic University, Tianjin 300387, China
3
Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China
4
College of Biomedical Engineering & Instrument Science, Zhejiang University, Zhejiang 310027, China
*
Author to whom correspondence should be addressed.
Received: 3 March 2018 / Revised: 18 April 2018 / Accepted: 23 April 2018 / Published: 26 April 2018
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [6248 KB, uploaded 3 May 2018]   |  

Abstract

A facile method for preparing an easy processing, repeatable and flexible pressure sensor was presented via the synthesis of modified multi-walled carbon nanotubes (m-MWNTs) and polyurethane (PU) films. The surface modification of multi-walled carbon nanotubes (MWNTs) simultaneously used a silane coupling agent (KH550) and sodium dodecyl benzene sulfonate (SDBS) to improve the dispersibility and compatibility of the MWNTs in a polymer matrix. The electrical property and piezoresistive behavior of the m-MWNT/PU composites were compared with raw multi-walled carbon nanotube (raw MWNT)/PU composites. Under linear uniaxial pressure, the m-MWNT/PU composite exhibited 4.282%kPa−1 sensitivity within the pressure of 1 kPa. The nonlinear error, hysteresis error and repeatability error of the piezoresistivity of m-MWNT/PU decreased 9%, 16.72% and 54.95% relative to raw MWNT/PU respectively. Therefore, the piezoresistive response of m-MWNT/PU had better stability than that of raw MWNT/PU composites. The m-MWNT/PU sensors could be utilized in wearable devices for body movement detection, monitoring of respiration and pressure detection in garments. View Full-Text
Keywords: modified multi-walled carbon nanotubes; polyurethane composite films; flexible pressure sensors; electrical conductivity; piezoresistive property modified multi-walled carbon nanotubes; polyurethane composite films; flexible pressure sensors; electrical conductivity; piezoresistive property
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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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He, Y.; Ming, Y.; Li, W.; Li, Y.; Wu, M.; Song, J.; Li, X.; Liu, H. Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube/Polymer Composites for Human Monitoring. Sensors 2018, 18, 1338.

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