Abstract
Recently,application-oriented strain sensor has been intensively investigated in the fields of human motion detection,personalized health management and portable medical diagnosis.Despite significant efforts in improving its sensitivity and linear sensing range,devel-oping the wearable strain sensor with stable signal remains a challenge.Herein,we proposed an ideal hybrid material with nearly zero temperature coefficient resistance(TCR)for temperature-insensitive strain sensing:the silver nanostructures(AgNTs)were introduced to coat the gra-phene foam(GrF)conformably by hydrothermal growth.The nanoscaled metal additives(TCR＞0)not only endow GrF(TCR＜0)with high electrical stability(TCR≈-0.3 ×10-3 ℃-1),but also offer the hybrid system additional structural elasticity,potential for next-generation of portable,stretchable and reliable devices.The resultant AgNTs@GrF hybrid material has been processed into a piezoresistive sensor with excellent sensing accuracy(strain error＜2.7％),satisfactory gauge factor(GF)of 227,wide sensing range up to 90％and good cyclic sta-bility(＞3000 cycles).Moreover,our strain sensor can be easily mounted on human skin as an epidermal device for reliable detection of electrophysiological stimuli,thus showing a great promising in practical wearable applications.
维普
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