Journal
CARBON
Volume 146, Issue -, Pages 701-708Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.02.060
Keywords
Carbon nanotube; Wet-spinning; Wearable strain sensor; Composite fibers; Human motion detection
Funding
- Fundamental Research Program of the Korea Institute of Materials Science [PNK6080, PNK6090]
- Korea Institute of Science and Technology Open Research Program
- [10074270]
- National Research Council of Science & Technology (NST), Republic of Korea [PNK6090, PNK6080] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Stretchable conductive fibers have attracted significant attention due to their ability to be directly woven into or stitched onto fabrics, making them ideal for use in the design of integrated wearable strain sensors. Here, we report on a highly stretchable multi-walled carbon nanotube (MWCNT)/Thermoplastic Polyurethane (TPU) fiber produced via a wet spinning process. The effects of MWCNT content and alignment on the structural, mechanical, electrical and strain-sensing properties of the composite fibers were investigated. The highest conductivity (6.77 S cm(-1)), tensile strength (28 MPa) and maximum elongation at break (565%) were obtained by controlling the MWCNT content. Gauge factor (GF) values were also affected by the content and MWCNT alignment in the composite fibers, as these parameters determine the change in the effective contact area and number of conductive paths available during stretching. The well-aligned MWCNT/TPU fiber showed a high GF value of 5200. Wearable strain sensors capable of obtaining real-time mechanical feedback for various human motion detections with different GFs and working strain ranges could be realized by controlling the MWCNT concentrations in the TPU matrix. (c) 2019 Elsevier Ltd. All rights reserved.
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