▎ 摘　　要

NOVELTY - Preparation of graphene-supported atom-grade thickness ultra-thin metal sheet comprises ultrasonically dispersing graphite oxide in deionized water to obtain monolayer graphene oxide colloidal sol-gel; mixing nitrate radical intercalated hydrotalcite and formamide solution under nitrogen gas protection and stirring; and slowly adding to monolayer graphene oxide colloidal sol-gel, stopping adding when upper layer liquid becomes transparent, centrifuging, washing, dispersing precipitate in deionized water, adding sodium borohydride, stirring, filtering, washing with ethanol, and vacuum drying. USE - Method for preparing graphene-supported atom-grade thickness ultra-thin metal sheet (claimed) used for catalysis, electrochemistry, and functional devices. ADVANTAGE - The ultra thin metal sheet achieves sufficient exposure to each atom and has excellent electrical properties. DETAILED DESCRIPTION - Preparation of graphene-supported atom-grade thickness ultra-thin metal sheet comprises ultrasonically dispersing graphite oxide in deionized water to obtain 1-5 mg/L monolayer graphene oxide colloidal sol-gel; mixing 0.05-0.2 g nitrate radical intercalated hydrotalcite and 50-200 mL formamide solution under nitrogen gas protection and stirring for 20-50 hours; and slowly adding to monolayer graphene oxide colloidal sol-gel, stopping adding when upper layer liquid becomes transparent, centrifuging, washing, dispersing precipitate in deionized water to get 0.7-1.3 mg/mL solution, adding 0.008-0.012 g/mL sodium borohydride, stirring for 1-3 hours, filtering, washing with ethanol, and vacuum drying 10-24 hours. An INDEPENDENT CLAIM is included for the preparation of graphite oxide comprising adding 1.5-3.0 g graphite powder and 1-1.5 g sodium nitrate in ice water bath, mixing, adding 50-69 mL concentrated sulfuric acid and 5.0-9.0 g potassium permanganate, magnetic stirring, heating at 30-40 degrees C for 20-30 minutes, adding 100-150 mL deionized water, heating to 90-100 degrees C for 10-15 minutes, cooling, pouring into 400-500 mL deionized water and 1-3 mL 28-30% hydrogen peroxide, centrifuging at 1000-1500 revolutions/minute, and vacuum drying for 10-24 hours.