▎ 摘　　要

NOVELTY - Preparation of graphene-based quantum dot-doped polymer composite film includes adding double-walled carbon nanotubes to a solution of concentrated sulfuric acid and concentrated nitric acid, extracting graphene quantum dots using chlorobenzene as extractant, mixing, shaking, standing, cleaning with deionized water, measuring photoluminescence of graphene quantum dots with fluorescence spectrophotometer, covering polyethylene terephthalate substrate with indium tin oxide (ITO) conductive film and spin coating mixture of polyvinylcarbazole and graphene quantum dots. USE - Method of preparing graphene-based quantum dot-doped polymer composite film. ADVANTAGE - The method has low cost, simple process and easy-to-control conditions. The film has uniform particle size, stable performance and blue fluorescence. DETAILED DESCRIPTION - Preparation of graphene-based quantum dot-doped polymer composite film comprises adding double-walled carbon nanotubes to a solution of concentrated sulfuric acid and concentrated nitric acid, placing in ultrasound for 5 hours, placing solution in condensation refluxing device, heating, mixing at 130-150 degrees C for 24 hours, cooling to room temperature, sonicating for 5 hours, diluting with deionized water, adjusting pH with concentrated sodium hydroxide to pH 8, placing solution in dialysis bag, standing for 4 days, performing ultrafiltration for 2 hours, centrifuging to obtain graphene nanosheet aqueous solution, extracting graphene quantum dots using chlorobenzene as extractant to obtain uniformly distributed graphene quantum, mixing, shaking, standing for 1.5 hours, taking out lower layer of chlorobenzene solution with dissolved graphene quantum dots, using high-resolution transmission electron microscope to observe the microstructure of graphene quantum dots, adding sample to carbon-coated copper grid, drying at room temperature, using atomic force microscope to observe size and thickness distribution of sample, adding solution on single crystal silicon wafer, cleaning with deionized water, using tapping mode to obtain undulating image of sample on silicon wafer, measuring photoluminescence of graphene quantum dots with fluorescence spectrophotometer, dissolving polyvinyl carbazole in graphene-containing quantum dots, covering polyethylene terephthalate substrate with indium tin oxide (ITO) conductive film and spin coating mixture of polyvinylcarbazole and graphene quantum dots at 4000 revolutions per minute.