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A flexible electrode with tetra-chiral structure connected in serpentine shape
Sensors and Actuators A: Physical ( IF 4.1 ) Pub Date : 2023-11-18 , DOI: 10.1016/j.sna.2023.114853
Junyao Wang , Yahao Liu , Huan Liu , Qi Hou , Jianxin Xu , Hongxu Pan , Jingran Quan , Yansong Chen , Hanbo Yang , Lixiang Li

Flexible electrodes are usually well-matched to the substrate as the core component of flexible electronics technology. However, when large deformation occurs, the conductive layer of flexible electrodes can mechanically fracture due to insufficient mechanical properties, leading to the failure of flexible electronic devices. Improving the mechanical properties of flexible electrodes is essential for the development of flexible electronics. Herein, a flexible electrode with a serpentine shape tetra-chiral structure is designed and fabricated via screen-printed process based on existing tetra-chiral structure. The research demonstrates that the serpentine tetra-chiral structure can improve the mechanical properties of the flexible electrode and the maximum tensile stress is reduced by 87.19 % relative to existing tetra-chiral structure. The flexible electrode is still conductive when the strain of that is 70 %, and the resistance is only 5 Ω and 4.4 Ω, respectively, at a bending angle of 180° and following 1000 times fold cycles. In addition, the flexible electrodes fabricated in this paper are utilized to realize the collection of ECG signals and pulse signals, showing greater potential in biological signal monitoring. The strategy proposed here is expected to maintain electrodes’ original functions under repeated use and complex deformation.



中文翻译:

蛇形连接的四手性结构柔性电极

柔性电极通常与基板良好匹配,作为柔性电子技术的核心部件。然而,当发生较大变形时,柔性电极的导电层会因机械性能不足而发生机械断裂,导致柔性电子器件失效。提高柔性电极的机械性能对于柔性电子产品的发展至关重要。本文基于现有的四手性结构,通过丝网印刷工艺设计并制造了具有蛇形四手性结构的柔性电极。研究表明,蛇形四手性结构可以提高柔性电极的机械性能,最大拉应力相对于现有四手性结构降低87.19%。柔性电极在应变70%时仍保持导电,弯曲角度180°、折叠1000次后电阻分别仅为5Ω和4.4Ω。此外,本文制作的柔性电极还可以实现心电信号和脉搏信号的采集,在生物信号监测方面显示出更大的潜力。这里提出的策略有望在重复使用和复杂变形的情况下保持电极的原始功能。

更新日期:2023-11-18
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