Superior piezoresistive strain sensing behaviors of carbon nanotubes in one-dimensional polymer fiber structure

Senlong Yu, Xingping Wang, Hengxue Xiang, Liping Zhu, Mike Tebyetekerwa, Meifang Zhu*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    114 Citations (Scopus)

    Abstract

    The fabrication of piezoresistive strain sensor with unified and balanced properties of high sensitivity, stretchability, and durability still remains a great challenge due to the oversimplified thin film structure of strain sensor. In this work, a high-performance strain sensor based on conductive poly(styrene-butadiene-styrene)/carbon nanotube fiber (SBS/CNT fiber, SCF) was prepared via wet-spinning. Then, the morphology, mechanical property, piezoresistive performance and sensing mechanism of the SCF-based sensors were systematically investigated. The resultant SCF-based sensors simultaneously demonstrated superior sensitivity (with a gauge factor of 175 under 50% deformation), wide workable range (>260%) and excellent durability due to the excellent flexibility of SBS polymer (the breaking elongation of pure SBS fiber > 1300%), high conductivity of CNT (105 S/cm) and the strong π-π interaction between CNT and SBS. These properties make the composite fiber a perfect fit to monitor various large deformation in a wide range of applications. Moreover, the associated sensing mechanism was also systematically explained by tunneling theory and the evolution of the conductive network during the stretching-releasing process.

    Original languageEnglish
    Pages (from-to)1-9
    Number of pages9
    JournalCarbon
    Volume140
    DOIs
    Publication statusPublished - Dec 2018

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