Highly stretchable and rehealable wearable strain sensor based on dynamic covalent thermoset and liquid metal
Highly stretchable and rehealable wearable strain sensor based on dynamic covalent thermoset and liquid metal
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DOI：
10.1088/1361-665x/ac1b3a
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发表时间：
2021
影响因子：
4.1
通讯作者：
Chuanqian Shi;Ying Zhao;Pengcheng Zhu;Jianliang Xiao;G. Nie
中科院分区：
文献类型：
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作者：
Chuanqian Shi;Ying Zhao;Pengcheng Zhu;Jianliang Xiao;G. Nie
可穿戴电子产品的尖端技术最近吸引了极大的关注。关键问题之一在于选择符合要求的环保材料和具有成本效益的制造方法。我们在这里报告一个可修复和高度可伸缩的可穿戴应变传感系统，该系统由先进材料实现。通过低成本将图案化液态金属线迹嵌入到动态共价热固性聚亚胺中，获得了一种机械柔性和电学敏感的应变传感器。提出了一种基于应变传感器长度分数的分析模型来描述外加应变下的电阻变化。计算结果与有限元模拟和实验结果吻合较好。由于聚亚胺中的键交换反应和LM的流动性，该传感系统在受损时具有良好的可恢复性。这些优异的性能使得应变传感器具有定量精确、经济友好和环境可持续的特点，因此在各个领域都有广泛的应用。
Cutting-edge technologies of wearable electronics have recently attracted tremendous attention. One of the key issues lies in the choice of compliant and environmental-friendly materials and cost-effective fabrication methods. We here report a rehealable and highly stretchable wearable strain sensing system enabled by advanced materials. By embedding patterned liquid metal (LM) line traces into dynamic covalent thermoset polyimine through a low-cost fabrication method, a mechanically flexible and electrically sensitive strain sensor is obtained. We proposed an analytical model based on length fractions of the strain sensor to describe the resistance change under applied strain. The results show good agreement with finite element simulation and experiment. Because of the bond exchange reactions in polyimine and the flowability of LM, the sensing system has excellent rehealability when it is damaged. These superior properties make the strain sensor quantitatively precise, economically friendly and environmentally sustainable, and thus can find wide applications in various areas.