Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 48, Pages 42058-42066Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b11431
Keywords
nanofibrous yarns; large-scale production; strain sensors; silver nanowires; human motion detection
Funding
- National Natural Science Foundation of China [51473129, 51503157, 51503160]
- National Science and Technology support program [2015BAE01B01]
- Nature Science Foundation of Hubei Province [2016CFA076, 2016CFB386]
- plan for Scientific and Technological Innovation Team of Excellent Young Investigator from Education Department of Hubei Province of China [T201408]
- Innovation Team from Science and Technology Department of Hubei Province of China [2015CFA028]
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Fiber-shaped strain sensors with great flexibility and knittability have been tremendously concerned due to the wide applications in health manager devices, especially in human motion detection and physiological signal monitoring. Herein, a novel fiber-shaped strain sensor has been designed and prepared by interpenetrating Ag nanowires (NWs) into polyolefin elastomer nanofibrous yarn. The easy-to-obtain structure and simple roll-to-roll process make the continuous large-scale production of nanofibrous composite yarn possible. The continuous and alternating stretching and releasing reversibly change the contact probability between AgNWs in this interpenetrating network, leading to the variations of electrical resistance of the sensor. The gauge factors of strain sensors are calculated as high as 13920 and the minimum detection limit is only 0.065%. In addition, the strain sensor shows excellent durability during 4500 cycles with the strain of 10%. The response times of stretching and releasing strains are 10 and 15 ms, respectively. Furthermore, the strain sensor has been successfully applied in human motion detections both in single yarn and knitted fabrics. The result shows the practicability in applications of monitoring limbs movements, eye motion changes, artificial vocal cords, human pulse, and complex motions, which shows great potential in wearable sensors and electronic skin.
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