Recent advances in self-healing hydrogel composites for flexible wearable electronic devices

Flexible electronic devices with mechanical properties like the soft tissues of human organs have great potential for the next generation of wearable and implantable electronic devices. Self-healing hydrogel composites typically have high tensile strength, high electrical conductivity and damage repair properties and have wide applications in flexible electronics, such as human-computer interaction, health detection and soft robots. Various self-healing hydrogel composites have been developed to produce new stretchable conductive materials with satisfactory mechanical and self-healing properties. This paper presents the fabrication of self-healing hydrogel composites and their application in flexible electronic devices. Firstly, the repair mechanism of physically cross-linked and chemically cross-linked self-healing hydrogel composites is presented. Secondly, self-healing double network hydrogels, self-healing nanocomposite hydrogels and double crosslinked self-healing hydrogel composites and their applications in flexible sensors, energy harvesting devices, energy storage devices and optical devices are presented and discussed. Finally, the challenges and prospects of self-healing hydrogel composites in flexible electronic devices in the future are presented.