▎ 摘　　要

NOVELTY - Preparing nano composite hydrogel involves dispersing graphene oxide in water, and then adding ammonia water to prepare graphene oxide dispersion liquid, adding acrylamide monomer, N,N'-methylenebisacrylamide and oxidizing initiator to graphene oxide dispersion, controlling the temperature at 0-4 degrees C, forming pre-reaction system. The mass fraction of N,N -methylenebisacrylamide relative to the graphene oxide dispersion is 1-5x 10-4 wt.%. The reducing initiator is added to the pre-reaction system obtained, reacted at 20-30 degrees C for 20-30 hours, and then heated to 40-60 degrees C to continue reaction for 1-3 hours, after reaction. The nanocomposite hydrogel is obtained. USE - Method for preparing nano composite hydrogel. ADVANTAGE - The method enables to prepare nano composite hydrogel that has excellent sensitivity and stability during external force loading and unloading, monitoring capabilities for human movement, and great potential in wearable devices and human-computer interaction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for making flexible capacitive pressure sensor, which involves taking the nanocomposite hydrogel, wrapping the surface of the nano-composite hydrogel with ultra-thin polyvinylidene fluoride film to prepare dielectric layer of flexible capacitive pressure sensor, adhering conductive cloth to both ends of the obtained dielectric layer to obtain flexible capacitive pressure sensor.