▎ 摘　　要

NOVELTY - Preparing graphene-rare earth up-conversion complex material comprises (i) taking citric acid monohydrate, histidine and dimethyl biguanide hydrochloride in a beaker, adding water, adding into a constant temperature blast drying oven to obtain histidine-dimethyl biguanide hydrochloride-functionalized graphene quantum dots, taking citric acid and histidine monohydrate, adding water, adding into blast drying oven to obtain histidine functional graphene quantum dots, taking citric acid monohydrate, adding water, adding into a constant temperature blast drying oven to obtain graphene quantum dots, preparing histidine-dimethyl biguanide hydrochloride-functionalized graphene quantum dots, (ii) preparing oleic acid-coated up-conversion nanomaterials by high-temperature pyrolysis, and (iii) obtaining a polyvinylpyrrolidone-coated upconversion material and histidine-dimethyl biguanide hydrochloride-functionalized graphene quantum dots, histidine-functionalized graphene quantum dots. USE - The graphene-rare earth up-conversion complex material is useful in joint pesticide toxicity evaluation (claimed). DETAILED DESCRIPTION - Preparing graphene-rare earth up-conversion complex material comprises (i) taking citric acid monohydrate, histidine and dimethyl biguanide hydrochloride in a beaker, adding 5-50 ml water, adding into a constant temperature blast drying oven at 150-250 degrees C for 0.5-10 hours to obtain histidine-dimethyl biguanide hydrochloride-functionalized graphene quantum dots, taking citric acid and histidine monohydrate, adding 5-50 ml water, adding into a constant temperature blast drying oven at 150-250 degrees C for 0.5-10 hours to obtain histidine functional graphene quantum dots, taking citric acid monohydrate, adding 5-50 ml water, adding into a constant temperature blast drying oven at 150-250 degrees C for 0.5-10 hours to obtain graphene quantum dots, preparing histidine-dimethyl biguanide hydrochloride-functionalized graphene quantum dots, histidine-functionalized graphene quantum dots, and sapene quantum dots into an aqueous solution of 25-100 mg/ml and adjusting the pH to neutral, (ii) preparing oleic acid-coated up-conversion nanomaterials by high-temperature pyrolysis, ultrasonically dispersing the prepared up-converted nanomaterial in cyclohexane, taking 1-10 ml of the dispersion in a centrifuge tube, adding ethanol to precipitate the nanoparticles, centrifuging and drying in a vacuum oven, adding HCl solution into the dried solid, and dispersing by vortexing and (iii) adding 1-10 mg polyvinylpyrrolidone into the solution obtained in step (ii), magnetically stirring at room temperature for 4-10 hours, adjusting the pH of the system to neutral with a basic phosphate buffered saline buffer solution, where the system is then made up to 15 ml with a neutral phosphate buffered saline to obtain a polyvinylpyrrolidone-coated upconversion material, taking 1-5 ml polyvinylpyrrolidone-coated upconversion nanomaterials, adding 0.1-10 ml to it to obtain histidine-dimethyl biguanide hydrochloride-functionalized graphene quantum dots, histidine-functionalized graphene quantum dots, and graphene quantum dot aqueous solution, shaking and mixing, histidine-dimethyl biguanide hydrochloride-functional fossil quantum dot modified rare earth up-conversion complex materials, where the histidine-functionalized graphene quantum dot modified rare earth up-conversion complexs and graphene quantum dot modified rare earth up conversion complex, using a laser with an excitation wavelength of 980 nm as the light source and scanning the fluorescence spectrum of the material. An INDEPENDENT CLAIM is also included for use graphene-rare earth up-conversion complex in joint pesticide toxicity evaluation, where the graphene-rare earth up-conversion complex material is a histidine-functionalized graphene quantum dot modified rare earth up-conversion complex material for preparing a graphene-rare earth up-conversion complex material.