A self-healing and wearable hydrogel sensor with a dynamic physical cross-linking structure can detect strain stimulus in a wide temperature range
JOURNAL OF MATERIALS CHEMISTRY C(2023)
Abstract
Traditional hydrogel sensors can easily freeze or evaporate under extreme conditions, resulting in their performance degradation. At the same time, the low strength/toughness and high resistance of hydrogels hinder their practical applications in different fields. In this work, we report a simple and effective strategy to prepare mechanically strong and conductive nanocomposite hydrogels by covalent interaction of acidified carbon fibers and various ions. In this paper, a wearable strain sensor with high sensitivity and flexibility and self-healing, anti-freezing and anti-drying properties was prepared using polyacrylic acid, sodium alginate and acidified carbon fibers as raw materials. The hydrogel has an interpenetrating cross-linked network structure. The interpenetrating cross-linking structure makes the hydrogel sensor exhibit excellent ductility, remarkable repeatability and stable sensing performance. The hydrogel can be used as a human strain sensor for the real-time detection of human movement, including joint movement and speech. The hydrogel strain sensor shows low strain detection limit (3% strain), fast response time (& SIM;100 ms), high sensitivity factor and excellent stability. The hydrogel has good self-adhesion with various substrates (such as copper, glass, plastic and skin). The hydrogel has good strain sensing performance at different strains (1-200%). In addition, the hydrogel can maintain excellent flexibility, extensibility and conductivity in a wide temperature range from -20 & DEG;C to 50 & DEG;C, effectively improving the practicability and durability of the hydrogel in practical applications. Therefore, the hydrogel has a good application prospect in wearable devices, soft robot systems and health monitoring applications.
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Key words
wearable hydrogel sensor,strain stimulus,self-healing,cross-linking
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