Preparation method for preparing graphene-ferrite composite film based on solvothermal method

The invention discloses a method for preparing a graphene-ferrite composite film based on a solvothermal method, which comprises the following steps: carrying out ultrasonic treatment on a graphene film, cleaning, soaking in an acid solution, and drying to obtain a graphene film with a rough surface; adjusting the pH value of the ferrite precursor solution to 7-11, fully stirring, transferring the ferrite solution into a high-pressure reaction kettle, adding the graphene film, keeping the temperature at 160-220 DEG C for 10-18 hours, cooling and drying to obtain the ferrite-graphene composite film. The preparation method disclosed by the invention is simple in process and capable of realizing large-scale production, and meanwhile, the structure of the graphene film is not damaged; the invention also relates to the ferrite-graphene composite film prepared by the method, the binding force between the ferrite particles and the graphene film is strong, the ferrite is uniformly distributed on the surface of the gr