Flame‐retardant, flexible, and breathable smart humidity sensing fabrics based on hydrogels for respiratory monitoring and non‐contact sensing

Smart sensing fabrics are becoming increasingly attractive in the emerging wearable areas of medical and military so far. Here, for first time, we present a smart humidity fabric (SHSF) based on moisture-sensitive polyacrylamide hydrogel respiratory monitoring non-contact sensing. Fabricated by situ cross-linking precursors fibers fabric, flexible SHSF shows excellent sensitivity, outstanding flame retardance, air permeability, water retention capacity, stability after treatment with lithium bromide solution. Specifically, its conductance increases more than 311 times as increased from 11% to 98%. Besides, sensor features good repeatability ability work normally under folding due nature. As clothing material, hydrogel–fabric composite exhibits 4.3 burning time compared cotton illustrating better retardance. The is used monitor human breathing finger approaching real demonstrating flexibility practical applications. This provides strategies preparing high-performance, flame-retardant electronic devices.