Abstract
Stretchable strain sensors have great potential for diverse applications including human motion detection,soft robotics,and health monitoring.However,their practical implementation requires improved repeata-bility and stability along with high sensing performances.Here,we utilized spiky vertical graphene(VG)sheets decorated on carbon nanofibers(VG@CNFs)to establish reliable conductive networks for resistive strain sensing.Three-dimensional(3D)VG@CNFs combined with reduced graphene oxide(rGO)sheets were simply coated on stretchable spandex fibers by ultrasonication.Because of the spiky geometry of the VG sheets,VG@CNF and rGO exhibited enhanced interactions,which was confirmed by mode I frac-ture tests.Due to the robust conductive networks formed by the VG@CNF and rGO hybrid,the fiber strain sensor exhibited a significantly improved strain range of up to 522％(with a high gauge factor of 1358)and stable resistance changes with minimal variation even after 5000 stretching-releasing cycles under a strain of 50％.In addition,the textile strain sensor based on the VG@CNF/rGO hybrid showed even improved repeatability for various strain levels of 10％to 200％,enabling its implementation on leg-gings for monitoring of squat posture.This study demonstrates the high potential of the 3D VG@CNF for high-performance and reliable stretchable strain sensors.
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