▎ 摘　　要

NOVELTY - Preparing modified graphene, comprise (i) preparing graphene oxide; (ii) preparing nano-metal oxide-graphene oxide suspension by ultrasonically dispersing graphene oxide in deionized water to obtain pure graphene oxide dispersion liquid, dispersing nano-metal oxide particles into graphene oxide dispersion liquid, stirring, and subjecting to continuous ultrasound; and (iii) preparing metal nano-particles doped graphene by subjecting nano-metal oxide-graphene oxide suspension to suction filtration or spin coating into a thin film, and drying under the protection of high temperature reduction. USE - The modified graphene is useful: as nano-composite material; and in lithium ion batteries, and composite paper-based super-capacitors. ADVANTAGE - The method is environmental friendly, economical, and not affected by agglomeration phenomenon; improves the electrical conductivity of modified graphene by more than 3 times; and facilitates uniform attachment of metal nano-particles onto the surface of graphene. DETAILED DESCRIPTION - Preparing modified graphene, comprise (i) preparing graphene oxide; (ii) preparing nano-metal oxide-graphene oxide suspension by ultrasonically dispersing graphene oxide in deionized water for 60-100 minutes to obtain pure graphene oxide dispersion liquid, dispersing nano-metal oxide particles into graphene oxide dispersion liquid, stirring for 30-60 minutes, and subjecting to continuous ultrasound for 30-60 minutes, to obtain the product, where the concentration of graphene oxide dispersion liquid, is 0.1-10 mg/ml, and the mass ratio of nano-metal oxides and graphene oxide in the nano-metal oxide-graphene oxide suspension, is 3.5:10; and (iii) preparing metal nano-particles doped graphene by subjecting nano-metal oxide-graphene oxide suspension to suction filtration or spin coating into a thin film, drying the film in presence of vacuum gas under the protection of high temperature reduction, to obtain metal nano-particles doped graphene, where the gas is nitrogen-hydrogen or argon-hydrogen mixed gas, having gas flow ratio of 2-8:1, and the high temperature reduction step includes (a) reducing metal oxide at 250-500 degrees C for 1-3 hours, and (b) reducing graphene oxide at 700-1000 degrees C for 6-8 hours, and heating at a speed of 1-10 degrees C/minute.