可印刷柔性应变传感器的制作及其对人体运动行为监测研究

Fabrication of Printable Flexible Strain Sensor for Monitoring Human Body Motions

该文主要研究了导电浆料PS@Ag/PDMS的流变特性与印刷性,以聚苯乙烯微球表面镀银(PS@Ag)的核壳结构粒子为导电填料,与聚二甲基硅氧烷(PDMS)预聚物及其固化剂复合配制PS@Ag/PDMS导电浆料,采用丝网印刷技术与旋涂工艺制备得到PDMS-PS@Ag/PDMS-PDMS三明治结构柔性应变传感器。柔性应变传感器在人体运动行为中的实时监测结果显示,该传感器在手肘关节与膝盖关节的弯曲——伸展循环运动中的相对电阻变化率分别高达约0.75和0.50,展现出较高的可拉伸柔性、灵敏度及一致性,在人体运动行为监测中具有广阔的应用前景。

In this paper, the rheology and printability of the PS@Ag/PDMS conductive paste were studied. The PS@Ag/PDMS conductive paste was fabricated by mixing the shell-core structured PS@Ag（silver nanoparticles coated on the polystyrene microspheres surfaces） hybrid conductive fillers with liquid polydimethylsiloxane（PDMS） prepolymer and its curing agent. The sandwiched flexible strain sensors of PDMS-PS@Ag/PDMSPDMS were fabricated by embedding the PS@Ag/PDMS composites in two PDMS encapsulated layers using printing technology and spinning coating process. The real-time monitoring results of the sandwiched flexible strain sensors in human body motions show that the relative changes of resistance of the flexible strain sensor in elbow joint and knee joint flexion-extension cycles can reach 0.75 and 0.50 respectively. The sensors show high stretchability, sensitivity and signal uniformity, which have great potentials in the application of human body motion monitoring.