Conductive polymer composites (CPCs) with good flexibility and electrical properties have attracted extensive concern for application in high-performance strain sensors. Here, a strain sensor with high performance was produced using biaxially stretched carbon nanotubes (CNTs)/thermoplastic polyurethane (TPU) nanocomposites. The results show that the biaxial stretching process enhanced the uniform dispersion and planar orientation of the CNTs, which improved the crystallinity of materials and the sensing property of the sensors. The optimal stretching ratios (SRs) of nanocomposites were also investigated. The 2.0 wt % CNT/TPU-1.5 strain sensor with a SR of 1.5 showed high sensitivity with a maximum gauge factor (GF) value of 16908.8, large detectable strain range (0–375%), and good cyclic stability (1000 cycles) and exhibited an application prospect in wearable devices.
Bibliographical noteFunding Information:
This work is supported by National Natural Science Foundation of China (12102374, 52173301), the Sichuan Science and Technology Program (2021YFH0031, 22JDGD0015 and 2022YFH0019), Special Funded Postdoctoral Program of Sichuan Province (021609912), Innovative Research Team of Southwest Petroleum University (2017CXTD01), and the International Cooperation Project of Chengdu (2019-GH02-00054-HZ).
© 2022 American Chemical Society.
- strain sensor
- biaxial stretching
- carbon nanotubes
- thermoplastic polyurethane