Poly(,-dimethyl)acrylamide-based ion-conductive gel with transparency, self-adhesion and rapid self-healing properties for human motion detection

• Published in: Soft matter 2022-08, Vol.18 (32), p.6115-6123
• Main Authors: Wang, Ling, Liu, Shengjie, Cheng, Jingjing, Peng, Yao, Meng, Fangfei, Wu, Zhaoqiang, Chen, Hong
• Format: Article
• Language: English
• Subjects: Acrylamide; Adhesion; Adhesive strength; Antibacterial activity; Electronic devices; Electronic equipment; Human motion; Ionic liquids; Ions; Irradiation; Motion detection; Motion perception; Room temperature; Sensors; Stretchability; Tensile properties; Transparency; Ultraviolet radiation
• ISSN: 1744-683X; 1744-6848
• DOI: 10.1039/d2sm00786j

Flexible strain sensors have been extensively studied for their potential value in monitoring human activity and health. However, it is still challenging to develop multifunctional flexible strain sensors with simultaneously high transparency, strong self-adhesion, fast self-healing and excellent tensile properties. In this study, we used N , N -dimethylacrylamide (DMA) in the imidazolium-based ionic liquid 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide ([BMIM][Tf 2 N]) for one-step" UV irradiation. A poly( N , N -dimethyl)acrylamide (PDMA) ion-conductive gel was prepared by site polymerization. Based on the good compatibility between PDMA and ionic liquid, the prepared ion-conductive gel has good transparency (∼90%), excellent stretchability (1080%), strong self-adhesion (67.57 kPa), fast self-healing (2 s at room temperature) and great antibacterial activity (∼99% bacterial killing efficiency). Moreover, the strain sensor based on the PDMA ion-conductive gel has good electromechanical performance and can detect different human motions. Based on the simple and easy-to-operate preparation method and the endowed multifunctionality of the PDMA ion-conductive gel, it has broad application prospects in the field of flexible electronic devices. An poly( N,N -dimethyl)acrylamide (PDMA) ion-conductive gel was prepared by "one-step" UV irradiation polymerization. Such ion gel has excellent electromechanical properties and can be used as a strain sensor to monitor human movements.