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

Sensors

Xiaojiu Li¹  Jinzhong Song²  Maoqi Wu³  Wei Li³  Yin He³  Yue Ming³  Yafang Li³  Hao Liu³ 

[1] Instrument Science, Zhejiang University, Zhejiang 310027, China;;College of Biomedical Engineering &School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China;

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

DOI  :  10.3390/s18051338

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown