Peng Hui, Yang Fan, Wang Xin, Feng Enke, Sun Kanjun, Hao Lili, Zhang Xusheng, Ma Guofu
Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
College of Chemistry and Chemical Engineering, Ningxia Normal University, Guyuan 756000, China.
ACS Appl Mater Interfaces. 2023 Oct 24. doi: 10.1021/acsami.3c12082.
Ionogels are increasingly used in flexible strain sensors, but it is still challenging to incorporate multifunctional properties such as flexibility, self-healing, adhesion, temperature resistance, and electrical conductivity. Herein, a facile and rapid one-step photoinitiated polymerization strategy is employed to prepare multifunctional ionogels by filling a hydrophobic and conductive ionic liquid into a flexible, hydrophobic fluoropolymer matrix. Thanks to the presence of abundant noncovalent interactions (hydrogen-bonding and ion-dipole interactions), the ionogels exhibit high transparency, excellent mechanical properties, self-healing ability, and adhesion. Moreover, rich C-F bonds in the fluoropolymer matrix can eliminate the interference of water molecules, resulting in excellent environmental tolerance such as high and low temperature resistance, waterproofness, and anticorrosion. Furthermore, the ionogel-based wearable strain sensor can sensitively detect and differentiate human movements and subtle muscle movements and serve as a Morse code signal transmitter for information transmission. The presented work provides an effective method to develop versatile flexible conductive ionogels for wearable devices and ionotronics.
离子凝胶越来越多地应用于柔性应变传感器中，但要将柔韧性、自修复性、粘附性、耐温性和导电性等多功能特性结合起来仍具有挑战性。在此，我们采用一种简便快速的一步光引发聚合策略，通过将疏水性导电离子液体填充到柔性疏水性含氟聚合物基质中来制备多功能离子凝胶。由于存在丰富的非共价相互作用（氢键和离子 - 偶极相互作用），离子凝胶具有高透明度、优异的机械性能、自修复能力和粘附性。此外，含氟聚合物基质中丰富的C - F键可以消除水分子的干扰，从而具有优异的环境耐受性，如耐高温和低温、防水和防腐。此外，基于离子凝胶的可穿戴应变传感器能够灵敏地检测和区分人体运动以及细微的肌肉运动，并作为莫尔斯电码信号发射器进行信息传输。本文的工作为开发用于可穿戴设备和离子电子学的多功能柔性导电离子凝胶提供了一种有效方法。
