Ultra-sensitive flexible strain sensor based on graphene nanocrystallite carbon film with wrinkle structures
Ultra-sensitive flexible strain sensor based on graphene nanocrystallite carbon film with wrinkle structures
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基于皱纹结构石墨烯纳米微晶碳膜的超灵敏柔性应变传感器
DOI：
10.1016/j.carbon.2019.03.001
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发表时间：
2019-06
期刊：
影响因子：
10.9
通讯作者：
Diao Dongfeng
中科院分区：
文献类型：
--
作者：
Xue Peidong;Chen Cheng;Diao Dongfeng
柔性应变传感器在检测人体的各种运动中有很高的要求，但在单个柔性应变传感器中同时集成高灵敏度和高拉伸性仍然是一个挑战。基于多尺度结构设计思想，利用具有褶皱结构的石墨烯纳米微晶碳膜，制作了一种超灵敏、高伸缩的应变传感器。在纳米尺度下，石墨烯纳米微晶的本征压阻特性和石墨烯纳米微晶之间的隧穿效应使石墨烯纳米微晶的应变计因子达到1071。在微尺度下，应变诱导的平行褶皱和垂直于应变方向的微裂纹可以保证柔性应变传感器在15%的最大应变下保持稳定。并进行了眼周、咽喉、腕部肌肉运动检测的应用试验。应用试验表明，该传感器具有灵敏度高、测量范围宽、响应速度快等特点，在人体活动监测中具有很大的应用潜力。
Flexible strain sensor is under high demand for detecting the various movements of human, but it is still a challenge to integrate high sensitivity and high stretchability simultaneously in a single flexible strain sensor. Here, based on a multi-scale structure design idea, an ultra-sensitive and highly stretchable strain sensor is fabricated using graphene nanocrystallite carbon film with wrinkle structure. In nano-scale, the intrinsic piezoresistive property of graphene nanocrystallite and the tunneling effect between graphene nanocrystallites bring an ultrahigh gauge factor of 1071. In micro-scale, the strain induced ordered parallel wrinkles and perpendicular microcracks to the strain direction can guarantee the flexible strain sensor stable under a maximum strain of 15%. Application tests of detecting the movement of muscles around eye, throat and wrist are conducted. These application tests prove that this strain sensor has high sensitivity, wide measurement range and rapid responsibility, suggesting a great potential in monitoring human activities.
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