▎ 摘　　要

NOVELTY - High sensitivity graphene flexible strain sensor is a flexible base material and the protective layer, which is set in the middle of the graphene film of sandwich structure. The graphene film has a thickness of 2-5 nm and includes 3-4 layers. The layer monolayer graphene has an electrical conductivity of 1300-1600 S/cm. USE - High sensitivity graphene flexible strain sensor. ADVANTAGE - The high sensitivity graphene flexible strain sensor has good skin with the human, so it is very suitable for human movement monitoring sensor and wearable device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a high sensitivity graphene flexible strain sensor, which involves: (A) preparing a graphene film and placing a graphene sheet into a mold for pre-pressing, dispersing the graphene sheet uniformly, and obtaining a pre-compressed graphene sheet; (B) showing the graphene sheet has a thickness of 2-5 nm and comprises 3-4 layers of single-layer graphene having an electric conductivity of 1300-1600 S/cm; (C) compressing the pre-pressed graphene sheet to obtain a graphene film, where the pressure of the tablet is 1-3 MPa, the holding time is 30-90 seconds, and the thickness of the obtained graphene film is 0.04-0.2 mm; (D) coating uniformly on the surface of one side of the flexible film with a pressure sensitive adhesive as a flexible substrate, and graphene film is place on the flexible substrate coat on the side of the pressure sensitive adhesive for bonding, a pair of wires are place on both ends of the graphene film, and cured by a conductive silver paste, and laminated to obtain a laminate preparation graphene film; and (E) coating the protective layer with a pressure sensitive adhesive on the side of the laminated graphene film to perform press bonding, obtaining a high sensitivity graphene flexible strain sensor, where the area of the graphene film less than the area of the protective layer is greater than the area of the flexible substrate. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of high sensitivity graphene flexible strain sensor.