▎ 摘　　要

NOVELTY - Self-powered hydrogel strain sensor comprises a conductive friction layer (1), a dielectric friction layer (2) and a copper foil electrode (3) packaged by an outer wrapping layer. The conductive friction layer is a silver nanowire electrode, the dielectric friction layer is a hydrogel film, the dielectric friction layer is fixedly connected with the copper foil electrode and a distance is maintained between the conductive friction layer and the dielectric friction layer. USE - The self-powered hydrogel strain sensor is useful for monitoring human health in scientific research field and industry. ADVANTAGE - The self-powered hydrogel strain sensor: has scientific and reasonable structure and good effect; is economical and convenient use; can realize self-power supply, and can be popularized; and provides hydrogen bond between the amino group on the monomer acrylamide chain and the oxygen-containing group on graphene oxide enhances the strength and stability of the water gel network. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing self-powered hydrogel strain sensor, comprising (i) dissolving the monomer acrylamide in the deionized water, stirring for 5-10 minutes, adding crosslinking agent N,N'-methylenebisacrylamide and the catalyst ammonium persulfate, and stirring again for 20 minutes to obtain the Polyacrylamide solution; (ii) adding the graphene oxide powder into the Polyacrylamide solution and stirring to prepare a 0.02 wt.% polyacrylamide/graphene oxide solution; (iii) performing ultrasonic treatment on the polyacrylamide/graphene oxide solution, using an ice bath as an ultrasonic bath during the ultrasonic treatment; (iv) taking the 1 ml sonicated solution, placing it into a cuboid polytetrafluoroethylene mold with a side length of 4cm and a height of 1mm, heating the mold at 80℃ for 18 minutes to generate cross-linking, taking out the cross-linked gelatinous substance and allowing to stand at room temperature for 5 minutes to obtain a polyacrylamide/graphene oxide hydrogel film; and (v) encapsulating the polyacrylamide/graphene oxide hydrogel film, the silver nanowire electrode and the copper foil electrode in the outer wrapping layer, so that the polyacrylamide/graphene oxide hydrogel film and the copper foil electrode are attached and fixedly connected and separating polyacrylamide/graphene oxide hydrogel films from silver nanowire electrodes. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of the self-powered hydrogel strain sensor. 1Conductive friction layer 2Dielectric friction layer 3Copper foil electrode