Journal
SMART MATERIALS AND STRUCTURES
Volume 27, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-665X/aaaba0
Keywords
stretchable strain sensor; PU yarn substrate; hydrogen bond; laminated structure; linearity; human motion monitoring
Funding
- National Natural Science Foundation of China [61471155, 61673369]
- Key Research and Development Project of Zhejiang Province [2018C01041]
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Strain sensors used as flexible and wearable electronic devices have improved prospects in the fields of artificial skin, robotics, human-machine interfaces, and healthcare. This work introduces a highly stretchable fiber-based strain sensor with a laminated structure made up of a graphene nanoplatelet layer and a carbon black/single-walled carbon nanotube synergetic conductive network layer. An ultrathin, flexible, and elastic two-layer polyurethane (PU) yarn substrate was successively deposited by a novel chemical bonding-based layered dip-coating process. These strain sensors demonstrated high stretchability (similar to 350%), little hysteresis, and long-term durability (over 2400 cycles) due to the favorable tensile properties of the PU substrate. The linearity of the strain sensor could reach an adjusted R-squared of 0.990 at 100% strain, which is better than most of the recently reported strain sensors. Meanwhile, the strain sensor exhibited good sensibility, rapid response, and a lower detection limit. The lower detection limit benefited from the hydrogen bond-assisted laminated structure and continuous conductive path. Finally, a series of experiments were carried out based on the special features of the PU strain sensor to show its capacity of detecting and monitoring tiny human motions.
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