Du Ruichun, Jin Qi, Zhu Tangsong, Wang Changxian, Li Sheng, Li Yanzhen, Huang Xinxin, Jiang Ying, Li Wenlong, Bao Tianwei, Cao Pengfei, Pan Lijia, Chen Xiaodong, Zhang Qiuhong, Jia Xudong
Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education (MOE), Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China.
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Small. 2022 May;18(19):e2200533. doi: 10.1002/smll.202200533. Epub 2022 Apr 7.
The demand for stretchable electronics with a broader working range is increasing for wide application in wearable sensors and e-skin. However, stretchable conductors based on soft elastomers always exhibit low working range due to the inhomogeneous breakage of the conductive network when stretched. Here, a highly stretchable and self-healable conductor is reported by adopting polyrotaxane and disulfide bonds into the binding layer. The binding layer (PR-SS) builds the bridge between polymer substrates (PU-SS) and silver nanowires (AgNWs). The incorporation of sliding molecules endows the stretchable conductor with a long sensing range (190%) due to the energy dissipation derived from the sliding nature of polyrotaxanes, which is two times higher than the working range (93%) of conductors based on AP-SS without polyrotaxanes. Furthermore, the mechanism of sliding effect for the polyrotaxanes in the elastomers is investigated by SEM for morphological change of AgNWs, in situ small-angle x-ray scattering, as well as stress relaxation experiments. Finally, human-body-related sensing tests and a self-correction system in fitness are designed and demonstrated.
对于可拉伸电子产品而言，其更广泛的工作范围需求在可穿戴传感器和电子皮肤的广泛应用中不断增加。然而，基于软弹性体的可拉伸导体在拉伸时由于导电网络的不均匀断裂，总是表现出较低的工作范围。在此，通过在结合层中采用聚轮烷和二硫键，报道了一种高度可拉伸且可自愈的导体。结合层（PR-SS）在聚合物基底（PU-SS）和银纳米线（AgNWs）之间搭建了桥梁。滑动分子的引入赋予了可拉伸导体长传感范围（190%），这归因于聚轮烷滑动性质产生的能量耗散，该范围比不含聚轮烷的基于AP-SS的导体的工作范围（93%）高出两倍。此外，通过扫描电子显微镜（SEM）研究了弹性体中聚轮烷的滑动效应机制，以观察银纳米线的形态变化、原位小角X射线散射以及应力松弛实验。最后，设计并展示了与人体相关的传感测试以及健身中的自我校正系统。
