Abstract
Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and comfortableness. However, yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable devices. This work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding technology. The fineness of single yarns as well as strength are both improved significantly compared to previous works. The piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz, and the cycle stability can maintain more than 3200 cycles. Furthermore, the piezoelectric yarns are further woven into piezoelectric plain fabric. According to the electrical performance, the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical performance. The yarn of the 10 cm in length and 600 μm in fineness can produce an output voltage of 120 mV. Meanwhile, Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement, such as bending, walking. Therefore, the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly, and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements, which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics.
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Acknowledgements
The authors acknowledge the financial support from National Natural Science Foundation, China (Nos. 52073224, 51703179), National Key Research and Development Program of China (No. 2019YFA0706801), Innovation Capacity Support Plan of Shaanxi, China (No. 2020PT-043), Scientific and Technology Project for Overseas Students of Shaanxi, China (No. 12), Scientific Research Program Funded by Shaanxi Provincial Education Department, China (Grant No: 18JS041), and Thousand Talents Program of Shaanxi Province.
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Xue, L., Fan, W., Yu, Y. et al. A Novel Strategy to Fabricate Core-Sheath Structure Piezoelectric Yarns for Wearable Energy Harvesters. Adv. Fiber Mater. 3, 239–250 (2021). https://doi.org/10.1007/s42765-021-00081-z
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DOI: https://doi.org/10.1007/s42765-021-00081-z