▎ 摘　　要

NOVELTY - Preparation of high-nitrogen doped graphene oxide involves mixing crystalline flake graphite, sodium nitrate and concentrated sulfuric acid, adding potassium permanganate and hydrogen peroxide, stirring, centrifuging, drying, obtaining graphene oxide powder, adding graphene quantum dot powder, mixing, performing ultrasonic treatment, coating the resultant material on a nickel foam, placing the foamed nickel into a quartz boat, placing the quartz boat into an illumination reduction device, introducing ammonia gas, and irradiating 100-120 mJ/cm2 laser or mercury lamp light for 1-30 minutes. USE - Preparation of high-nitrogen doped graphene oxide (claimed). ADVANTAGE - The method enables efficient, convenient, economical and large-scale preparation of high-nitrogen doped graphene oxide. By controlling nitrogen doping content, and illumination time, the conductivity and bandgap effect of the graphene oxide are improved. DETAILED DESCRIPTION - Preparation of high-nitrogen doped graphene oxide involves mixing crystalline flake graphite, sodium nitrate and concentrated sulfuric acid under ice bath, slowly adding potassium permanganate, stirring in a magnetic stirrer, heating at 30-40 degrees C for 1-3 hours, adding deionized water, mixing uniformly for 10-20 minutes, adding hydrogen peroxide, stirring for 5-20 minutes, obtaining suspension, adding 0.00001-0.001 mol/L dilute nitric acid solution for cleaning, centrifuging at 10000-20000 rpm, obtaining precipitate, repeatedly washing and centrifuging 2-3 times, adding deionized water, washing and centrifuging 8-12 times to remove impurities, obtaining graphene oxide solution, drying, obtaining graphene oxide powder, adding deionized water, mixing, obtaining 10-20 mg/mL solution, performing ultrasonic treatment for 1-3 hours to obtain dispersion solution, adding graphene quantum dot powder, performing ultrasonic treatment for 0.5-2 hours, coating the resultant material on a foamed nickel by a knife, repeatedly coating 5-20 times, placing the foamed nickel into a quartz, then placing the quartz boat into an illumination reduction device, introducing ammonia gas at flow rate of 10-30 torr, irradiating 100-120 mJ/cm2 laser or mercury lamp light for 1-30 minutes, and removing the product of oxygen-containing groups. The graphene quantum dot powder is prepared by mixing pyrene and nitric acid at 70-90 degrees C for 10-14 hours, filtering through a microporous membrane, obtaining yellow flocs, reacting with sodium hydroxide, adding deionized water and sodium hydroxide, performing ultrasonic treatment for 0.5-2 hours, placing the resultant mixture in a stainless steel reactor lined with a polytetrafluoroethylene, heating to 160-200, reacting for 10-18 hours, filtering the resultant reaction solution through a microporous membrane, dialyzing in a dialysis bag of 3500 Da for two days, drying in a vacuum drying chamber. The volume ratio of suspension and dilute nitric acid solution is 1:2-5. The addition amount of graphite is 6-15 times the addition amount deionized water and hydrogen peroxide. The mass ratio of graphene oxide powder to graphene quantum dot powder is 5-7:1.