Wu Shanshan, Guo Jing, Wang Yilei, Xie Hui, Zhou Shaobing
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
ACS Appl Mater Interfaces. 2022 Sep 21;14(37):42317-42327. doi: 10.1021/acsami.2c13223. Epub 2022 Sep 6.
Hydrogel-based wearable flexible electronics are attracting tremendous interest for use in human healthcare. However, many of the existing hydrogel electronics are often susceptible to dehydration, leading to weakened stretchability and inaccurate signal extraction. Besides, hydrogels are desired to be much smarter for self-repairing physical damage and enabling performance manipulation. Herein, we develop a kind of cryopolymerized polyampholyte gels with the multifunctionality of antidehydration, self-healing, and shape-memory for wearable sensing electronics. The antidehydration property is enabled by the incorporation of glycerol, endowing the sensing electronics with excellent stretchability and strain-sensing performance in long-term monitoring. The ionic bonds in the polyampholyte gel possess a dynamic feature regulated by alternant NaCl(aq) and HO treatments, laying the foundation for self-healing and shape-memory. As a result, the sensing electronics can automatically repair physical damages without any sacrifice in sensing performance, after healing both conductivity and strain-sensing performance could return to the initial levels. The shape-memory function enables the temporal adjustment of the initial state of the sensing electronics; both the conductivity and sensing performance, for instance, signal intensity, can be manually manipulated. In all, the cryopolymerized polyampholyte gels with antidehydration, self-healing, and shape-memory properties can be an inspiration to develop sustainable and tunable gel-based electronics for human motion monitoring.
基于水凝胶的可穿戴柔性电子产品在人类医疗保健领域正引起极大的关注。然而，现有的许多水凝胶电子产品往往容易脱水，导致拉伸性减弱和信号提取不准确。此外，人们期望水凝胶更加智能，能够自我修复物理损伤并实现性能调控。在此，我们开发了一种具有抗脱水、自愈合和形状记忆多功能的冷冻聚合聚两性电解质凝胶，用于可穿戴传感电子设备。通过加入甘油实现抗脱水性能，使传感电子设备在长期监测中具有出色的拉伸性和应变传感性能。聚两性电解质凝胶中的离子键具有由交替的NaCl（水溶液）和HO处理调节的动态特性，为自愈合和形状记忆奠定了基础。结果，传感电子设备能够自动修复物理损伤，而不会在传感性能上有任何损失，愈合后导电性和应变传感性能均可恢复到初始水平。形状记忆功能能够对传感电子设备的初始状态进行适时调整；例如，导电性和传感性能（如信号强度）都可以手动调控。总之，具有抗脱水、自愈合和形状记忆特性的冷冻聚合聚两性电解质凝胶可为开发用于人体运动监测的可持续且可调节的基于凝胶的电子产品提供启发。
