▎ 摘　　要

NOVELTY - Graphene electrocardiographic electrode sheet includes a conductive gel layer (4), a graphene film (3) and a conductive electrode button (1). The conductive gel layer is laid on one side of the graphene film, and the graphene film is electrically connected to the conductive electrode button. USE - Graphene electrocardiographic electrode sheet. ADVANTAGE - The graphene electrocardiographic electrode sheet effectively improves the signal-to-noise ratio of physiological electrical signals, does not need to apply conductive paste on the surface of the human body in advance, and there is no graphene residue after use, and method realizes the rapid preparation of a graphene film that does not require a substrate and has a certain mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a substrate-free self-supporting graphene film, which involves suspending and tightening the polyimide film, and using a laser to induce reduction of the polyimide film, cutting the unreduced area of the polyimide film, and obtaining the remaining portion which is the substrate-free self-supporting graphene film. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of graphene electrocardiographic electrode sheet. Conductive electrode button (1) Medical adhesive substrate (2) Graphene film (3) Conductive gel layer (4) Release film (5)