基于纳米银颗粒-聚多巴胺-碳纳米管导电材料的三明治型柔性应变传感器

Sandwich flexible strain sensor based on silver nanoparticles-polydopamine-carbon nanotube conductive material

着眼医疗保健、软机器人和人机交互等领域柔性应变传感器需兼备高灵敏和宽工作应变范围,本文设计基于纳米银颗粒-聚多巴胺-碳纳米管(AgNPs-PDA-CNT)的敏感材料体系,制备一种层层包覆型三明治结构柔性应变传感器。材料表征和特性测试结果表明:借助PDA黏附性和还原性,AgNPs均匀分散且固定在PDA-CNT表面。独特制备工艺使AgNPs-PDA-CNT导电材料紧密结合硅橡胶毛细管内壁和聚二甲基硅氧烷(PDMS),AgNPs-PDA-CNT渗入PDMS且浓度呈梯度分布。传感器具有高灵敏系数(GF)和宽工作应变范围(0%~44%时GF为69.04,44%~66%时GF为253.13,66%~76%时GF为1253.8)、快速响应(75 ms)和恢复(90 ms)、良好稳定性和重复性。将传感器应用于人体运动精确监测、软体手指本体感知与软抓手抓取行为监测,取得良好应用效果。

Since flexible strain sensors require high sensitivity and a wide strain range in healthcare,soft robotics and human-computer interaction,this work designed a flexible strain sensor based on silver nanoparticles-polydopamine-carbon nanotubes(AgNPs-PDA-CNT)sensitive material system,and prepared a layer coated sandwich structure flexible strain sensor.The results of material characterization and property test showed that AgNPs were uniformly dispersed and fixed on the surface of PDA-CNT by virtue of PDA adhesion and reducibility.The AgNPsPDA-CNT conductive material is closely bonded to the inner wall of silicone rubber capillary tube and polydimethylsiloxane(PDMS).AgNPs-PDA-CNT penetrates into PDMS and the concentration is in gradient distribution.The sensor has high sensitivity coefficient(GF)and wide strain range(69.04 when 0%-44%,253.13 when 44%-66%,1253.8 when 66%-76%),fast response(75 ms)and recovery(90 ms),good stability and repeatability.The sensor is applied to human motion monitoring,soft finger ontology sensing and soft grasping behavior monitoring,and good application results are achieved.