Flexible Strain Sensors with Enhanced Sensing Performance Prepared from Biaxially Stretched Carbon Nanotube/Thermoplastic Polyurethane Nanocomposites

Xiaoyu Chen, Dong Xiang, Jiayi Li, Xuezhong Zhang, Eileen Harkin-Jones, Yuanpeng Wu, Chunxia Zhao, Hui Li, Zhenyu Li, Ping Wang, Yuntao Li

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)3071-3079
Number of pages9
JournalACS Applied Electronic Materials
Volume4
Issue number6
Early online date2 Jun 2022
DOIs
Publication statusPublished - 28 Jun 2022

Bibliographical note

Funding 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).

Publisher Copyright:
© 2022 American Chemical Society.

Keywords

  • strain sensor
  • biaxial stretching
  • carbon nanotubes
  • thermoplastic polyurethane
  • nanocomposite

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