Ultrastretchable Helical Conductive Fibers Using Percolated Ag Nanoparticle Networks Encapsulated by Elastic Polymers with High Durability in Omnidirectional Deformations for Wearable Electronics
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작성자 최고관리자 작성일 24-09-02 13:36본문
- Journal
- Advanced functional materials
- Vol
- 30(29)
- Page
- 1910026
Stretchable interconnects with invariable conductivity and complete elasticity,which return to their original shape without morphological hysteresis,are attractive for the development of stretchable electronics. In this study,a polydimethylsiloxane-coated multifilament polyurethane-based helicalconductive fiber is developed. The stretchable helical fibers exhibit remarkableelectrical performance under stretching, negligible electrical and mechanicalhysteresis, and high electrical reliability under repetitive deformation (10 000cycles of stretching with 100% strain). The resistance of the helical fibers barelyincreases until the applied strain reaches the critical strain, which is based onthe helical diameter of each fiber. According to finite element analysis, uniformstress distribution is maintained in the helical fibers even under full stretching,owing to the fibers’ true helix structure. In addition, the stretchable helicalfibers have the ability to completely return to their original shapes even afterbeing fully compressed in the vertical direction. Cylinder-shaped connectingpieces made using 3D printing are designed for stable connection between thehelical fibers and commercial components. A deformable light-emitting diode(LED) array and biaxially stretchable LED display are fabricated using helicalfibers. A skin-mountable band-type oximeter with helical fiber-based electrodesis also fabricated and used to demonstrate real-time detection of cardiacactivities and analysis of brain activities.
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