基于石墨烯复合材料的柔性应力传感器制备及力电特性

Preparation and application of flexible strain sensor based on graphene composites

采用激光热还原方法制备了基于聚苯乙烯(PS)纳米颗粒与石墨烯复合材料的柔性应力传感器。研究表明掺入聚苯乙烯纳米颗粒可以使原本紧密连接的石墨烯碎片接触部分的结构发生破坏和重构。重构后的结构在应力下电阻变化率明显加大,从而提高了传感器的灵敏度。通过与未掺入纳米颗粒的石墨烯应力传感器进行对比,系统地研究了掺入纳米颗粒的石墨烯复合材料应变状态下的电阻改变的物理机制,力电测试结果表明性能最优的为质量占比(PS纳米颗粒质量/石墨烯质量)12. 5%的90 nm纳米颗粒复合传感器,其灵敏度在小应变下(1. 05%)可以达到250,是复合前石墨烯柔性应力传感器的31倍,且该传感器具有较高的重复性。

Flexible strain sensor based on polystyrene(PS)nanoparticles and graphene composites was prepared by laser thermal reduction.Studies show that by incorporating polystyrene nanoparticles,the structure of the contact portions of the graphene fragments that were originally tightly connected can be destroyed and reconstructed.The reconstructed structure increases the resistance change under stress significantly,thereby increasing the sensitivity of the sensor.By comparing with graphene strain sensors without PS nanoparticles,the physical mechanism of the resistance change of the graphene composites doped with PS nanoparticles under strain was systematically studied.The results show that when the mass ratio of PS nanoparticle to graphene is 12.5%,composite sensor sensor prepared with 90 nm PS nanoparticle can reach a sensitivity of 250 at a small strain(1.05%),which is 31 times as high as that of a graphene flexible strain sensor without PS nanoparticle,and the sensor has a high repeatability.