▎ 摘　　要

NOVELTY - Preparing molybdenum trioxide-graphene oxide composite material comprises mixing molybdenum trioxide conversion nanoparticles in hexane dispersion solution and nitrosonium tetrafluoroborate in dichloromethane solution, shaking until upconversion luminescence nanomaterials (UCNPs) are precipitated; dispersing molybdenum trioxide re-conversion nanoparticles in water, adding terminal amino hyperbranched polymer solution, ultrasonicating; and dispersing terminal amino hyperbranched polymer modified molybdenum trioxide re-conversion nanoparticle in water, adding graphene oxide, and ultrasonicating. USE - The method is useful for preparing molybdenum trioxide-graphene oxide composite material (claimed). ADVANTAGE - The method is simple to operate. DETAILED DESCRIPTION - Preparing molybdenum trioxide-graphene oxide composite material comprises (i) dissolving ammonium heptamolybdate, ytterbium trifluoroacetate and erbium trifluoroacetate or thulium trifluoroacetate in deionized water, where the bath ratio is 1:10, then ultrasonicating for 1-24 hours, adjusting the pH to 2-5, heating in oil bath at 100-120 degrees C for 1-5 hours, naturally cooling to room temperature, adding absolute ethanol, centrifuging to obtain the precipitate, repeatedly washing with water and ethanol, and finally, centrifuging the resulting precipitate and annealing; (ii) mixing 1-5 g/l of 5 ml molybdenum trioxide conversion nanoparticles in hexane dispersion solution and 0.1-0.6 g/l of 5 ml nitrosonium tetrafluoroborate in dichloromethane solution at room temperature, gently shaking the mixture until upconversion luminescence nanomaterials (UCNPs) are precipitated, then centrifuging, and removing the supernatant; (iii) dispersing the molybdenum trioxide re-conversion nanoparticles in water, in the volume ratio of 1:1-1:10, adding 0.01-100 g/l terminal amino hyperbranched polymer solution, then ultrasonicating for 10-120 minutes, then centrifuging, and washing with distilled water and ethanol multiple times; and (iv) dispersing 5 g/l terminal amino hyperbranched polymer modified molybdenum trioxide re-conversion nanoparticle in water, adding graphene oxide, ultrasonicating at 80 degrees C for 1-12 hours, centrifuging, washing with distilled water and ethanol multiple times, and drying.