摘要
Multifunctional flexible resistance sensor based on improved PVA hydrogel. • Stable mechanical property, high sensitivity, water retention, and frost resistance. • Hydrogen bond cross-linking and component synergy endow excellent performance. • Provides a novel candidate for human motion monitoring. Hydrogels have emerged as promising candidates for flexible wearable sensors owing to their tissue-like properties, excellent breathability, and skin-friendliness. However, it remains challenging to develop hydrogel-based sensors that simultaneously possess stable mechanical properties, high sensitivity, good water retention, and frost resistance. Herein, conceptually inspired by the interpenetrating network structure and flexibility of human skin, a mainly physically cross-linked conductive dual-network composite hydrogel composed of polyvinyl alcohol, carboxymethyl cellulose, tannic acid, multilayer graphene, and glycerol was successfully prepared and denoted as PVA/CMC/TA/G/Gly (PCTGG) hydrogel. The PCTGG hydrogel was fabricated through physical cross-linking followed by a glycerol/water binary solvent soaking strategy. In this system, the polyvinyl alcohol/carboxymethyl cellulose dual network acts as a flexible matrix, tannic acid enhances hydrogen-bond interactions,multilayer graphene forms conductive pathways, and glycerol improves water retention and antifreezing capability. Benefiting from this synergistic design, the PCTGG hydrogel exhibits excellent stretchability with an elongation at break of 346%, a fracture stress of approximately 0.57 MPa, a fast response time of 100 ms, and good frost resistance with a freezing point of −22.7 °C.Furthermore, a proof-of-concept sedentary reminder system was developed to remind users to avoid prolonged sitting, demonstrating its potential in human motion monitoring, electronic skin, and soft robotics. Download: Download high-res image (130KB) Download: Download full-size image
危险品化学品经营许可证（带存储）