材料科学
聚吡咯
静电纺丝
纳米颗粒
复合材料
可穿戴计算机
拉伤
纳米纤维
聚合物
纳米技术
聚合
计算机科学
医学
内科学
嵌入式系统
作者
Jingxian Ding,Longxiang Mei,Xiaowei Guo,Deyu Guo,Li Ma,Yanghai Gui,Dongjie Guo
标识
DOI:10.1002/marc.202300033
摘要
Current conductive polymers win wide applications in smart strain-stress sensors, bioinspired actuators, and wearable electronics. This work investigates a novel strain sensor by using conductive polypyrrole (PPy) nanoparticles coated polyvinyl alcohol (PVA) fibers as matrix. The flexible, water-resistant PVA fibers are initially prepared by combined electrospinning and annealing techniques, and then are coated with PPy nanoparticles through in situ polymerization. The resultant PPy@PVA fibers exhibit stable, favorable electrical conductivities due to the uniform point-to-point connections among PPy nanoparticles, e.g. after three-time' polymerizations, the PPy@PVA3 fiber film presents a sheet resistance of ≈840 Ω sq-1 and a bulk conductivity of ≈32.1 mS cm-1 . Cyclic sensing tests reveal that, PPy@PVA sensors show linear relationships between the relative resistance variations and the applied strains, e.g. the linear deviation of PPy@PVA3 is only 0.9 % within 33 % strain. After long-term stretching/releasing cycles, the PPy@PVA sensor exhibits stable, durable, and reversible sensing behaviors, no evident "drift" is observed over 1,000 cycles (5,000 seconds).
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