One-pot freezing-thawing preparation of cellulose nanofibrils reinforced polyvinyl alcohol based ionic hydrogel strain sensor for human motion monitoring. (1st January 2022)

• Record Type: Journal Article
• Authors: Hu, Jianquan; Wu, Yinglong; Yang, Qian; Zhou, Quanwei; Hui, Lanfeng; Liu, Zhong; Xu, Feng; Ding, Dayong
• Is Part Of: Carbohydrate polymers. Volume 275(2022)
• Publication Date: 2022-01-01
• Subjects: Cellulose nanofibril -- Polyvinyl alcohol -- Ionic hydrogel -- Strain sensor -- Freezing-thawing -- Human motion monitoring; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2021.118697
• Languages: English
• ISSNs: 0144-8617

Abstract

Abstract: Ionic conductive hydrogels have been widely applied in sensors, energy storage and soft electronics recently. However, most of the polyvinyl alcohol (PVA) based ionic hydrogels are mainly fabricated by soaking the hydrogels in high concentration electrolyte solution which can induce the waste of electrolyte and solvent. Herein, we have designed cellulose nanofibrils (CNF) and ZnSO4 reinforced PVA based hydrogels through a one-pot simple freezing-thawing method at low ZnSO4 concentration without any soaking process. Furthermore, the hydrogel with 0.4% CNF exhibited stress up to 0.79 MPa (242% strain) and high ionic conductivity of 0.32 S m −1 (0.07 M ZnSO4 ). Moreover, hydrogel sensor displayed high linear gauge factor 1.70 (0–200% strain), excellent stability, durability and reliability. The integrated hydrogel sensor also showed excellent sensor performance for human motion monitoring. This work provides a new prospect for the design of cellulose reinforced conductive hydrogels via a facile method. Graphical abstract: Unlabelled Image Highlights: Polyvinyl alcohol based conductive hydrogel was fabricated via a one-pot freezing-thawing process. Cellulose nanofibrils enhanced the mechanical property and ionic conductivity of hydrogel. Zinc sulfate electrolyte facilitated the formation of PVA microcrystalline. Hydrogel sensor exhibited excellent sensor property suitable for human motion monitoring.