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Quercetin-Enhanced Interfacially Dynamically Bonded Hydrogels with Fast Self-Healing and Ultrahigh Strain Sensitivity
Tailong Dong1, Zihuan Yuan1, Xinmeng Zhang1
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
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Conductive hydrogels with multifunctional properties have been increasingly recognized as ideal materials for wearable sensing applications, yet balancing high sensitivity, mechanical properties, and self-healing remains a critical scientific challenge. Herein, a PAA/PEI/Que/Al3+ hydrogel was synthesized via a multidynamic network strategy. The hydrogel demonstrated remarkable tensile strength (93.2 kPa) and ultrahigh sensitivity (Gauge Factor = 22.09), capable of detecting motions ranging from joint movements to subtle physiological signals (pulse, speech). The introduction of quercetin could introduce catechol-mediated self-adhesion and enhance the self-healing capability of the hydrogels. With synergistic contributions from dynamic imine bonds, hydrogen bonding, metal coordination, and electrostatic interactions, the hydrogel demonstrated 100% self-healing efficiency within 2 h without external stimulation. Notably, the self-healed hydrogel retained postrepair functionality with the accurate monitoring of human movements, demonstrating exceptional durability for long-term wearable applications. This breakthrough addresses persistent durability challenges in flexible electronics while establishing a quercetin-enhanced dynamic bonding system that opens frontiers in personalized healthcare monitoring systems and human-machine interfaces.
