Aiming at the problem of flexible strain sensors used for smart wearable devices,a method for preparing flexible strain sensor based on a bilayer conductive structure,graphene/WPU(GR/WPU)layer and carbon black/waterborne polyurethane(CB/WPU)layer is proposed by using layer-by-layer(LBL)assembly technique and creating regular crack structure on the surface of the upper conductive layer with the aid of a laser steel mesh die.The sensor has excellent properties such as a high sensitivity factor GF of 466 to 1569,a wide operating range up to 100% strain,excellent durability of 1000 cycles,low detection limit of 0.25% strain,fast response time of 86 ms and good resilience,which allows the sensor to accurately detect signals due to large joint movements,but also to monitor subtle physiological signals in real-time,and has broad application prospects in the future in the fields of electronic skin,human-machine interaction and smart wearable devices.
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