Highly adhesive, self-healing, anti-freezing and anti-drying organohydrogel with self-power and mechanoluminescence for multifunctional flexible sensor

Flexible conductive hydrogels have great applications in soft electronic sensing. However, the preparation of multifunctional integrated conductive hydrogel was still very challenging. Herein, an anti-freezing and anti-drying polyacrylic acid/ cellulose nanofibrils-glycerol (PAA/CNF-Gly, PCG) organohydrogel was designed, it integrated high transparency (∼85%), high stretchability (∼980%), high adhesion (25.4 kPa) and self-healing abilities. It not only has excellent sensing property, but also can be assembled into self-powered equipment for sensing and as an emergency power source. Furthermore, the sensor can also specifically recognize the downward/upward bending direction of the legs and elbows. Moreover, the PCG organohydrogel can be combined with the copper doped zinc sulfide/polydimethylsiloxane (ZnS:Cu/PDMS) elastic luminescent layer to realize the visualization of the sensor, and the movement track and position of the object on the composite mechanoluminescent (ML) sensor can be sensed and recorded at the same time, which provides a new high-level security method for anti-counterfeiting.