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An Ultrasensitive, Durable and Stretchable Strain Sensor with Crack-wrinkle Structure for Human Motion Monitoring
Chinese Journal of Polymer Science ( IF 4.3 ) Pub Date : 2020-10-14 , DOI: 10.1007/s10118-021-2500-8
Ze-Yu Li , Wei Zhai , Yun-Fei Yu , Guo-Jie Li , Peng-Fei Zhan , Jian-Wei Xu , Guo-Qiang Zheng , Kun Dai , Chun-Tai Liu , Chang-Yu Shen

Flexible strain sensor has promising features in successful application of health monitoring, electronic skins and smart robotics, etc. Here, we report an ultrasensitive strain sensor with a novel crack-wrinkle structure (CWS) based on graphite nanoplates (GNPs)/thermoplastic urethane (TPU)/polydimethylsiloxane (PDMS) nanocomposite. The CWS is constructed by pressing and dragging GNP layer on TPU substrate, followed by encapsulating with PDMS as a protective layer. On the basis of the area statistics, the ratio of the crack and wrinkle structures accounts for 31.8% and 9.5%, respectively. When the sensor is stretched, the cracks fracture, the wrinkles could reduce the unrecoverable destruction of cracks, resulting in an excellent recoverability and stability. Based on introduction of the designed CWS in the sensor, the hysteresis effect is limited effectively. The CWS sensor possesses a satisfactory sensitivity (GF = 750 under 24% strain), an ultralow detectable limit (strain = 0.1%) and a short respond time of 90 ms. For the sensing service behaviors, the CWS sensor exhibits an ultrahigh durability (high stability > 2×104 stretching-releasing cycles). The excellent practicality of CWS sensor is demonstrated through various human motion tests, including vigorous exercises of various joint bending, and subtle motions of phonation, facial movements and wrist pulse. The present CWS sensor shows great developing potential in the field of cost-effective, portable and high-performance electronic skins.



中文翻译:

具有裂纹皱纹结构的超灵敏,耐用和可拉伸的应变传感器,用于人体运动监测

柔性应变传感器在健康监测,电子皮肤和智能机器人等方面的成功应用具有广阔的前景。在这里,我们报告基于石墨纳米板(GNPs)/热塑性聚氨酯(TPU)/聚二甲基硅氧烷(PDMS)纳米复合材料的具有新型裂纹皱纹结构(CWS)的超灵敏应变传感器。通过在TPU基板上按压并拖动GNP层,然后用PDMS封装作为保护层来构造CWS。根据面积统计,裂纹和皱纹结构的比例分别为31.8%和9.5%。拉伸传感器时,裂缝会破裂,皱纹可以减少无法恢复的裂缝破坏,从而具有出色的可恢复性和稳定性。基于在传感器中引入设计的CWS,有效地限制了磁滞效应。CWS传感器具有令人满意的灵敏度(在24%应变下GF = 750),超低可检测极限(应变= 0.1%)和90 ms的短响应时间。对于传感服务行为,CWS传感器具有超高的耐用性(高稳定性> 2×104个拉伸-释放循环)。通过各种人体运动测试证明了CWS传感器的出色实用性,包括各种关节弯曲的剧烈运动以及发声,面部运动和手腕脉动的微妙运动。当前的CWS传感器在成本有效的,便携式的和高性能的电子皮肤领域中显示出巨大的发展潜力。

更新日期:2020-10-19
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