Journal
CARBON
Volume 140, Issue -, Pages 1-9Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.08.028
Keywords
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Funding
- National Natural Science Foundation of China [51733002]
- program for Changjiang Scholars and Innovative Research Team in University [IRT16R13]
- Fundamental Research Funds for the Central Universities [2232018A3-01, 2232018D3-03]
- Shanghai Fundamental Research Projects [16JC1400701]
- Innovation Program of Shanghai Municipal Education Commission [E00055]
- Opening Project of State Key Laboratory of for Modification of Chemical Fibers and Polymer Materials, Donghua University [LK1607]
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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(styrenebutadiene-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 (10(5) S/cm) and the strong 17-17 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. (C) 2018 Elsevier Ltd. All rights reserved.
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