Abstract
The flexible piezoresistive sensor (FPS) with typical three-dimensional (3D) structure is a key component for many wearable products because of its excellent performance. We report a high-performance FPS based on micro-nano 3D networked conductive electrospun membrane. This membrane is framed by thermoplastic polyurethane electrospun membrane (TPUEM) coated with reduced graphene oxide(rGO) bridged conductive poly (styrene-co-methacrylic acid)@polypyrrole (P(St-MAA)@PPy) microspheres. Interestingly, P(St-MAA)@PPy microsphere is adsorbed on the surface of rGO/TPU fiber, leading to the formation of a hierarchical conductive surface that enhances the sensitivity to external pressure. The obtained P(St-MAA)@PPy/rGO/TPUEM pressure sensor can effectively detect small pressure (0.94 Pa). The pressure sensor shows a low operating voltage (1.0 V), high sensitivity (13.65 kPa−1), short response time (37 ms), and excellent cycle stability (over 1650 cycles). As a result, this pressure sensor is used to monitor the body's physiological signals and motions, such as the human pulse, facial muscles and joint movements, etc. This novel P(St-MAA)@PPy/rGO/TPUEM pressure sensor can meet the performance requirements of wearable electronic products, demonstrating great potential in human health monitoring and human-computer interaction.
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