Due to its porous structure and good elasticity, conductive polyurethane (PU) sponge is used as the main substrate of the flexible piezoresistive pressure sensor. The effective combination of conductive PU sponge and electrode material is the foundation for the pressure sensor, but it needs to be bonded by expensive conductive silver paste or copper paste. In addition, the common electrode materials weaken the flexibility of the PU sponge pressure sensors because of their rigidity. Herein, PU sponge and polyester (PET) fabric are first bonded to produce (PET-PU) composite, which is then impregnated with graphene oxide (GO). The obtained reduced graphene oxide(rGO)@PET fabric and rGO@PU are used as electrode and piezoresistive material, respectively. Then rGO@(PET-PU) composite is assembled into a pressure sensor only by using wire connections in the rGO@PET fabric. Benefiting from excellent piezoresistive behavior, rGO@(PET-TPU) pressure sensor displays high sensitivity (0.255 kPa⁻¹ at below 2.6 kPa), wide detection limit (≈0–85.0%), and long durability (over 1800 cycles). Besides, the pressure sensor demonstrates good performance in monitoring human activities, including finger bending, clicking keyboard, breathing, elbow bending, and walking posture, thus providing a promising material for human activity monitoring.

中文翻译：

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高性能柔性压阻式压力传感器采用导电织物电极和聚氨酯海绵的集成设计

由于其多孔结构和良好的弹性，导电聚氨酯（PU）海绵被用作柔性压阻式压力传感器的主要基板。导电PU海绵与电极材料的有效结合是压力传感器的基础，但需要用昂贵的导电银浆或铜浆进行粘合。此外，普通电极材料因其刚性而削弱了PU海绵压力传感器的柔韧性。在此，PU海绵和聚酯（PET）织物首先粘合以生产（PET-PU）复合材料，然后用氧化石墨烯（GO）浸渍。所得还原氧化石墨烯(rGO)@PET织物和rGO@PU分别用作电极和压阻材料。然后仅通过在 rGO@PET 织物中使用导线连接，将 rGO@(PET-PU) 复合材料组装成压力传感器。得益于出色的压阻行为，rGO@(PET-TPU) 压力传感器显示出高灵敏度 (0.255 kPa^-1在低于 2.6 kPa)、宽检测限 (≈0–85.0%) 和长耐用性（超过 1800 次循环）。此外，压力传感器在监测人体活动方面表现出良好的性能，包括手指弯曲、点击键盘、呼吸、肘部弯曲和行走姿势，为人体活动监测提供了一种很有前景的材料。