Pan Xuanyu, Zhu Hongyuan, Qin Fufei, Jing Mingxing, Wu Han, Sun Zhuangzhi
Province Key Laboratory of Forestry Intelligent Equipment Engineering, College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China.
Sensors (Basel). 2025 Aug 1;25(15):4765. doi: 10.3390/s25154765.
Ion-conductive-hydrogel strain sensors demonstrate broad application prospects in the fields of flexible sensing and bioelectric signal monitoring due to their excellent skin conformability and efficient signal transmission characteristics. However, traditional preparation methods face significant challenges in enhancing adhesion strength, conductivity, and mechanical stability. To address this issue, this study employed a freeze-thaw cycling method, using polyvinyl alcohol (PVA) as the matrix material, tannic acid (TA) as the adhesion reinforcement material, and lithium chloride (LiCl) as the conductive medium, successfully developing an ion-conductive hydrogel with superior comprehensive performance. Experimental data confirm that the PVA-TA-0.5/LiCl-1 hydrogel achieves optimal levels of adhesion strength (2.32 kPa on pigskin) and conductivity (0.64 S/m), while also exhibiting good tensile strength (0.1 MPa). Therefore, this hydrogel shows great potential for use in strain sensors, demonstrating excellent sensitivity (GF = 1.15), reliable operational stability, as the Δ signal remains virtually unchanged after 2500 cycles of stretching, and outstanding strain sensing and electromyographic signal acquisition capabilities, fully highlighting its practical value in the fields of flexible sensing and bioelectric monitoring.
离子导电水凝胶应变传感器因其优异的皮肤贴合性和高效的信号传输特性，在柔性传感和生物电信号监测领域展现出广阔的应用前景。然而，传统制备方法在提高粘附强度、导电性和机械稳定性方面面临重大挑战。为解决这一问题，本研究采用冻融循环法，以聚乙烯醇（PVA）为基体材料，单宁酸（TA）为粘附增强材料，氯化锂（LiCl）为导电介质，成功研制出一种综合性能优异的离子导电水凝胶。实验数据证实，PVA-TA-0.5/LiCl-1水凝胶在粘附强度（猪皮上为2.32 kPa）和导电性（0.64 S/m）方面达到了最佳水平，同时还表现出良好的拉伸强度（0.1 MPa）。因此，这种水凝胶在应变传感器中具有巨大的应用潜力，表现出优异的灵敏度（GF = 1.15）、可靠的操作稳定性，在2500次拉伸循环后Δ信号几乎保持不变，以及出色的应变传感和肌电信号采集能力，充分凸显了其在柔性传感和生物电监测领域的实用价值。
