Gel‐based flexible sensors (GBFSs) have garnered significant interest in the field of flexible sensors (FSs) owing to their unique properties, including excellent biocompatibility, self‐healing capability, and superior transparency. However, despite these advantages, conventional single polymer network GBFSs often suffer from limited mechanical strength, low sensitivity, and low durability, which hinders their long‐term performance. To overcome the aforementioned limitations, incorporating interpenetrating polymer network (IPN) into GBFS fabrication offers a promising solution. IPN GBFSs, which are composed of two or more independent and complementary crosslinked polymer networks, exhibit significantly enhanced mechanical properties and sensing performance through the synergistic effect between the crosslinked networks, thereby expanding their scope of practical applications under complex environmental conditions. This review highlights the design concepts and recent advances of IPN GBFSs across various sensing domains, covering their fabrication materials, preparation methods, assembly strategies, and their practical applications in health, motion, and environmental monitoring.
Wu et al. (Fri,) studied this question.