▎ 摘　　要

NOVELTY - The method involves mixing the piezoelectric nano-lead-free material with polydimethylsiloxane at a mass ratio of 0.1 to 7:10. The silicon wafer is sucked on the silicone machine, and the obtained nano piezoelectric composite solvent is dropped on the silicon wafer by a dropper. The sample is taken out in a culture dish such that the culture dish is placed in a vacuum drying oven. A high voltage polarization of 2000-3000 V is applied to the graphene nanocomposite piezoelectric film for 15-20 hours. The domains of the particles are aligned in the piezoelectric film in the direction of the electric field to obtain a lead-free nanocomposite transducer with optimal piezoelectric properties. A lead-free piezoelectric composite film ultrasonic transducer based on graphene doping is obtained by soldering the electrodes on both sides of the nanocomposite transducer and encapsulate with polyethylene terephthalate (PET). USE - Method for preparing lead-free piezoelectric composite film ultrasonic transducer based on graphene doping. ADVANTAGE - The method has the flexibility of the polydimethylsiloxane, the performance of the frequency bandwidth of the traditional single lead-free piezoelectric ultrasonic transducer, and a good application prospect in the preparation of the lead-free composite thin film ultrasonic transducer. The lead-free composite piezoelectric film ultrasonic transducer has simple preparation process, short cycle, low cost, no pollution and good flexibility. The piezoelectric performance of the ultrasonic transducer is enhanced after doping graphene, and the output frequency bandwidth is improved. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram illustrating the preparation process of a graphene-doped nanocomposite film ultrasonic transducer. (Drawing includes non-English language text)