▎ 摘　　要

NOVELTY - An apical impulse sensor based on double-layer buckling structure-reduced graphene oxide thin films comprises a power conversion unit, an electrical signal acquisition unit and a constant voltage unit. The constant voltage unit outputs a voltage signal of 0.1 V to the power conversion unit. The electrical signal acquisition unit collects the resistance signal of the power conversion unit. The power conversion unit collects mechanical energy of the apical impulse and converts it into an electrical signal. USE - Apical impulse sensor based on double-layer buckling structure-reduced graphene oxide thin films is useful for testing cardiac apex impulse. ADVANTAGE - The apical impulse sensor based on double-layer buckling structure-reduced graphene oxide thin films has large specific surface area, high conductivity and repeatability and improved mechanical performance and is simple and economical to manufacture. DETAILED DESCRIPTION - An apical impulse sensor based on double-layer buckling structure-reduced graphene oxide thin films comprises a power conversion unit, an electrical signal acquisition unit and a constant voltage unit. The constant voltage unit outputs a voltage signal of 0.1 V to the power conversion unit. The electrical signal acquisition unit collects the resistance signal of the power conversion unit. The power conversion unit collects mechanical energy of the apical impulse and converts it into an electrical signal. The power conversion unit is produced by weighing 3 ml aqueous reduced graphene solution, adding 50 ml deionized water to the graphene solution, stirring, ultrasonically treating until the solution is uniformly dispersed, filtering using a sand core filter device with a filter membrane, taking out the filter, drying in a blast drying oven at 70 degrees C for 1 hour, taking cured polydimethylsiloxane, pre-stretching in one direction by 30%, transferring the reduced graphene on the filter onto the pre-stretched polydimethylsiloxane by pressing, soaking the polydimethylsiloxane in acetone solution, dissolving, drying polydimethylsiloxane with reduced graphene oxide film in a blast drying oven at 70 degrees C, connecting double-layers reduced graphene oxide film attached to the pre-stretched 30% polydimethylsiloxane surface to a copper electrode, where the electrical signal acquisition unit and the constant voltage unit are connected with reduced graphene oxide film through the copper electrode, withdrawing the tensile force to return to the initial state to obtain a buckled reduced graphene oxide film, cutting the buckled reduced graphene oxide film and contacting the buckled reduced graphene oxide film surface with face to face to obtain power conversion unit.