基于石墨烯/聚丙烯酸三维多孔材料的高灵敏高稳定性柔性压阻材料的制备及其应用

摘要

3D graphene/PAA porous composites (3D-rGO/PAA) were prepared by the adhesion between PAA elastomer and restructuring graphene aerogels which were synthesized via lyophilization of graphene oxide.The morphology of 3D-rGO/PAA unordered conductive networks was characterized by scanning electron microscope.The results show that parts of porous structures are remained and there are plenty of contact points existing in the adjacent graphene layers.3D-rGO/PAA composites possess dual piezoresistive effect and excellent flexibility and conformability due to the elastic PAA substrate.The relationship between microstructure and the sensing performance and its sensing mechanism were also analyzed.The reconstruction of graphene conductive networks under external stress causes the change of contact resistance,and abundant contact points make 3D-rGO/PAA have excellent sensing properties.It shows that 3D-rGO/PAA composites possess high linearity and sensitivity,rapid response and excellent mechanical stability,which can monitor the movement of wrist joint and knuckle as well as the vibration of the vocal cords.%以氧化石墨烯为前驱体制备石墨烯三维多孔材料(3D-rGO),并将其破碎重组装与聚丙烯酸弹性基底(PAA)进行复合,制得石墨烯/聚丙烯酸三维多孔复合材料(3D-rGO/PAA).通过扫描电镜观察发现3D-rGO/PAA呈现微观无序的导电网络结构,仍保持部分多孔结构,且互相搭接的石墨烯片层之间存在大量接触点;PAA基底的引入,使得复合材料具有可拉可压双重压阻效应以及优异的柔性和贴合性.对微观形貌与力敏传感性能的关系进行研究发现,在受到外部应力时,石墨烯导电网络重新构建引起接触电阻的变化,而片层间大量的接触点赋予3D-rGO/PAA优异的传感性能,表现出较高的灵敏度、线性度、快速响应性、高机械稳定性(＞7 000次),可实时监测腕关节、指关节的运动以及声带的振动情况.