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Sensors (Basel). 2018 Apr 26;18(5). pii: E1338. doi: 10.3390/s18051338.

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

He Y1,2,3, Ming Y4, Li W5, Li Y6, Wu M7, Song J8, Li X9,10, Liu H11,12.

Author information

1
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. smileheyin@yeah.net.
2
School of Fashion and Art, Tianjin Polytechnic University, Tianjin 300387, China. smileheyin@yeah.net.
3
Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China. smileheyin@yeah.net.
4
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. yming2017@sinano.ac.cn.
5
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. lweiyuanb@163.com.
6
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. liyafang@tjpu.edu.cn.
7
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. wwumaoqi@163.com.
8
College of Biomedical Engineering & Instrument Science, Zhejiang University, Zhejiang 310027, China. sjinzhongkx@163.com.
9
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. lixiaojiu@tjpu.edu.cn.
10
School of Fashion and Art, Tianjin Polytechnic University, Tianjin 300387, China. lixiaojiu@tjpu.edu.cn.
11
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China. liuhao_0760@163.com.
12
Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China. liuhao_0760@163.com.

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.

KEYWORDS:

electrical conductivity; flexible pressure sensors; modified multi-walled carbon nanotubes; piezoresistive property; polyurethane composite films

PMID:
29701643
PMCID:
PMC5982526
DOI:
10.3390/s18051338
[Indexed for MEDLINE]
Free PMC Article

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