Department of Chemistry, School of Science, Tianjin University, Tianjin 300350, P. R. China.
Department of Applied Chemistry, School of Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan.
Biomacromolecules. 2021 Mar 8;22(3):1220-1230. doi: 10.1021/acs.biomac.0c01724. Epub 2021 Feb 15.
Multifunctional hydrogel with outstanding conductivity and mechanical flexibility has received enormous attention as wearable electronic devices. However, fabricating transparent, ultrastretchable, and biocompatible hydrogel with low-temperature stability still remains a tremendous challenge. In this study, an ultrastretchable, highly transparent, and antifreezing zwitterionic-based electronic sensor is developed by introducing zwitterionic proline (ZP) into gellan gum/polyacrylamide (GG/PAAm) double network (DN) hydrogel. The existence of ZP endows the hydrogel with remarkable frost resistance. The toughness and transparency of zwitterionic Ca-GG/PAAm-ZP DN hydrogel can be maintained down to -40 °C. Also, the zwitterionic hydrogel shows good biocompatibility and protein adsorption resistance. The zwitterionic Ca-GG/PAAm-ZP DN hydrogel-based strain sensor can accurately monitor human motions (such as speaking and various joint bendings) under a broad temperature range from -40 to 25 °C. The zwitterionic Ca-GG/PAAm-ZP DN hydrogel-based strain sensor will be of immense value in the field of wearable electronic devices, especially for extreme environment applications.
具有优异导电性和机械柔韧性的多功能水凝胶作为可穿戴电子设备受到了极大关注。然而，制造具有低温稳定性的透明、超高拉伸和生物相容性的水凝胶仍然是一个巨大的挑战。在这项研究中，通过在结冷胶/聚丙烯酰胺（GG/PAAm）双网络（DN）水凝胶中引入两性离子脯氨酸（ZP），开发出一种超拉伸、高透明、抗冻的两性离子基电子传感器。ZP 的存在赋予水凝胶优异的抗冻性。两性离子 Ca-GG/PAAm-ZP DN 水凝胶的韧性和透明度在低至-40°C 时仍能保持。此外，两性离子水凝胶具有良好的生物相容性和蛋白质吸附抗性。基于两性离子 Ca-GG/PAAm-ZP DN 水凝胶的应变传感器可以在-40 至 25°C 的宽温度范围内准确监测人体运动（如说话和各种关节弯曲）。基于两性离子 Ca-GG/PAAm-ZP DN 水凝胶的应变传感器在可穿戴电子设备领域具有巨大的价值，特别是在极端环境应用中。
