Wearable Tissue Adhesive Ternary Hydrogel of N-(2-Hydroxyl) Propyl-3-trimethyl Ammonium Chitosan, Tannic Acid, and Polyacrylamide

Bionic electronic skin has aroused widespread attention in intelligent robots, health detection, and other aspects. To improve the inherent fragility and adhesion of the hydrogel, a multifunctional electronic skin mediated by tannic acid and chitosan quaternary ammonium salt was manufactured. In this work, by simply mixing chitosan quaternary ammonium salt, tannic acid, and acrylamide without further treatment, a flexible, conductive, and antibacterial adhesive hydrogel was directly prepared. The chitosan quaternary ammonium salt plays a leading role in the electromechanical properties and antibacterial properties of the hydrogel. Tannic acid gives the hydrogel good and reproducible adhesion and oxidation resistance. More importantly, the obtained hydrogel has good sensing properties and can detect mechanical conduction signals of human body motion. This work provides a feasible method to prepare hydrogel sensors with high antibacterial efficiency, excellent mechanical properties, and good adhesion for broad-range application in human motion detection and intelligence skins.