▎ 摘　　要

NOVELTY - A nitrogen-doped graphene thin film is prepared by performing ultrasonic treatment to 2-6 mg/ml graphite oxide aqueous solution at 100-200 W power for 0.5-1.5 hours to obtain graphene oxide sol, mixing hydrazine hydrate solution with 50-80 mass% hydrazine hydrate and ethanol solution with 50 mass% anhydrous ethanol to obtain hydrazine hydrate, ethanol, and water mixed solution with hydrazine hydrate concentration of 10-20 mg/ml and ethanol concentration of 300-700 mg/ml, mixing obtained graphene oxide sol and hydrazine hydrate, ethanol, and water mixed solution, and reacting at 80-95 degrees C. USE - Preparation of nitrogen-doped graphene thin film for smartphone, tablet personal computer, LED lighting device, smart TV, video camera, digital camera, semiconductor manufacturing device, and vehicle electric device. ADVANTAGE - Preparation method is simple and energy-saving, and controls nitrogen doping ratio, density, and thermal conductivity of product, and prepared nitrogen-doped graphene thin film is light in weight and thin, and has high thermal conductivity and good toughness, adhesion property, and mechanical properties. DETAILED DESCRIPTION - A nitrogen-doped graphene thin film is prepared by performing ultrasonic treatment to 2-6 mg/ml graphite oxide (GO) aqueous solution at 100-200 W power for 0.5-1.5 hours to obtain graphene oxide sol, mixing 50-80 mass% hydrazine hydrate of hydrazine hydrate solution and 50 mass% anhydrous ethanol of ethanol solution to obtain hydrazine hydrate, ethanol, and water mixed solution with hydrazine hydrate concentration of 10-20 mg/ml and ethanol concentration of 300-700 mg/ml, mixing obtained graphene oxide sol and hydrazine hydrate, ethanol, and water mixed solution in which mass ratio hydrazine hydrate:GO is 2.4-4.4, reacting at 80-95 degrees C for 0.5 to 1.5 hours, vacuum filtering to obtain nitrogen-doped graphene thin film, room temperature drying, performing vacuum thermal annealing for 1-3 hours, and pressurizing at room temperature and 1000-4000 psi pressure for 0.5-2 hours.