▎ 摘　　要

NOVELTY - Preparation of gold/reduced graphene oxide/ferric oxide ternary composite material, involves dispersing sodium hydroxide and ferric chloride hexahydrate in water to form a solution, adding oxalic acid and graphite oxide and stirring to obtain mixture, hydrothermally reacting mixed solution, subjecting hydrothermally reacted product to solid-liquid separation, centrifuging, washing resulting solid product with deionized water and ethanol to obtain reduced graphene oxide/ferric oxide composite product, and ultrasonically dispersing in deionized water. USE - Preparation of gold/reduced graphene oxide/ferric oxide ternary composite material used as catalyst in gas sensor application. ADVANTAGE - The method enables preparation of gold/reduced graphene oxide/ferric oxide ternary composite material by simple and economical process. DETAILED DESCRIPTION - Preparation of gold/reduced graphene oxide/ferric oxide ternary composite material, involves (1) dispersing sodium hydroxide and ferric chloride hexahydrate in water to form a solution, adding oxalic acid and graphite oxide and stirring to obtain mixture, the concentration of sodium hydroxide is 0.05-0.1 mol/L, the concentration of ferric chloride hexahydrate is 0.05-0.1 mol/L, the concentration of oxalic acid is 0.1-0.5 mol/L, and the mass ratio of ferric chloride hexahydrate and sodium hydroxide is 1:(1-2), the mass ratio of ferric chloride hexahydrate and oxalic acid is 1:(1-5), the mass ratio of ferric chloride hexahydrate and graphite oxide is 1:(0.01-0.05), (2) hydrothermally reacting the mixed solution at 100-200 degrees C for 10-20 hours, subjecting the hydrothermally reacted product to solid-liquid separation, centrifuging, washing the resulting solid product several times with deionized water and ethanol to obtain reduced graphene oxide/ferric oxide composite product, (3) ultrasonically dispersing reduced graphene oxide/ferric oxide powder in 15 ml deionized water, adding 0.01 mol/L tetrachloro alloy acid solution and 0.01 mol/L poly-L-lysine solution, stirring for 15 minutes, the mass ratio of reduced graphene oxide/ferric oxide and tetrachloro alloy acid solution is (10-15):1, the mass ratio of tetrachloro alloy acid and poly-L-lysine solution is 1:(1-1.5), (4) dripping trisodium citrate solution to resulting mixed solution, the molar ratio of tetrachloro alloy acid and trisodium citrate is (0.5-1):1, stirring for 30 minutes, centrifuging the resulting product, washing, drying at 60 degrees C for 24 hours and heating the resulting solid product at 300 degrees C for 30 minutes.