基于三维导电网络多孔敏感层的柔性电阻式应变传感器

Flexible resistance strain sensor based on porous sensitive layer of three-dimensional conductive network

柔性应变传感器在人体运动检测、人机交互等可穿戴领域应用潜能巨大。设计了一种基于三维导电网络多孔敏感层的柔性电阻式应变传感器。基于炭黑(CB)/石墨烯纳米片(GNP)/热塑性聚氨酯(TPU)导电复合材料构成敏感层的三维导电网络。采用非溶剂致相分离法诱导TPU的分离在敏感层内部制造多孔结构。由于高效的协同导电网络和多孔微结构的有效结合,传感器具有较高的灵敏度(应变系数最大为40.66)、较宽的拉伸范围(ε=0~25%)和良好的循环拉伸可靠性。实验表明,该传感器的电阻输出变化在检测手指弯曲/恢复过程中具有较好的对称性,在智能可穿戴领域展示出潜在的应用价值。

Flexible strain sensors have great potential in wearable fields such as human motion detection and human-computer interaction.A flexible resistance strain sensor based on porous sensitive layer of three-dimensional conductive network was designed.The three-dimensional conductive network of the sensitive layer was formed based on the conductive composite,which contained carbon black(CB)/graphene nanoplatelet(GNP)/thermoplastic polyurethane(TPU).Non solvent induced phase separation method was used to separate TPU to produce porous structure inside the sensitive layer.Owing to the effective combination of highly efficient synergetic conductive network and porous microstructure,the designed sensor has high sensitivity(GF=40.66),wide strain range(ε=0-25%)and good cyclic tensile reliability.The experiments show that the output of the sensor has good symmetry in the detection process of finger bending/recovery,which shows potential in the field of intelligent wearable devices.