Xiao Yanwen, Lu Chengcheng, Yu Zhenkun, Lian Yue, Ma Yulin, Chen Zhaoxia, Jiang Xueliang, Zhang Yuhong
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China.
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
ACS Appl Mater Interfaces. 2023 Sep 20;15(37):44280-44293. doi: 10.1021/acsami.3c08949. Epub 2023 Sep 12.
The prospect of ionic conductive hydrogels in multifunctional sensors has generated widespread scientific interest. The new generation of flexible materials should be combined with superior mechanical properties, high conductivity, transparency, sensitivity, good self-restoring fatigue properties, and other multifunctional characteristics, while the current materials are difficult to meet these requirements. Herein, we prepared poly(acrylamide-acrylic acid) (P(AM-AA))/gelatin/glycerol-Al (PGGA) ionic conducting hydrogel by one-pot polymerization under UV light. The prepared PGGA ionic conductive hydrogel had high tensile strength (539.18 kPa), excellent tensile property (1412.96%), good fast self-recovery and fatigue resistance, high transparency (>80%), excellent moisturizing, and antifreezing/drying properties. In addition, the ionic conductive hydrogel-based strain sensor can respond to mechanical stimulation and generate accurate, stable, and recyclable electrical signals, with excellent sensitivity (GF 5.81). In addition, the PGGA hydrogel could be used as flexible wearable devices for monitoring multiple strain and subtle movements of different body parts at different temperatures. Interestingly, the PGGA hydrogel capacitive pen embedded in the mold can be used to write and draw on the screen of a phone or tablet. This new multifunctional ionic conducting hydrogel shows broad application prospects in E-skin, motion monitoring, and human-computer interaction in extreme environments.
离子导电水凝胶在多功能传感器中的应用前景引起了广泛的科学关注。新一代柔性材料应具备优异的机械性能、高导电性、透明度、灵敏度、良好的自恢复疲劳性能等多功能特性，而目前的材料难以满足这些要求。在此，我们通过紫外光下的一锅法聚合制备了聚（丙烯酰胺 - 丙烯酸）（P(AM - AA)）/明胶/甘油 - 铝（PGGA）离子导电水凝胶。所制备的PGGA离子导电水凝胶具有高拉伸强度（539.18 kPa）、优异的拉伸性能（1412.96%）、良好的快速自恢复和抗疲劳性能、高透明度（>80%）、优异的保湿性以及抗冻/干燥性能。此外，基于离子导电水凝胶的应变传感器能够响应机械刺激并产生准确、稳定且可循环的电信号，具有优异的灵敏度（GF 5.81）。另外，PGGA水凝胶可作为柔性可穿戴设备，用于在不同温度下监测不同身体部位的多种应变和细微运动。有趣的是，嵌入模具中的PGGA水凝胶电容笔可用于在手机或平板电脑屏幕上书写和绘图。这种新型多功能离子导电水凝胶在电子皮肤、运动监测以及极端环境下的人机交互方面展现出广阔的应用前景。
