▎ 摘　　要

NOVELTY - Manufacture of tertiary nanocomposite film involves preparing a graphene oxide powder, preparing a polyvinylidene fluoride/cerium oxide/graphene oxide nanocomposite film using the graphene oxide powder by performing dissolution of required amount of polyvinylidene fluoride powder in dimethylformamide by heating the polyvinylidene fluoride powder at 70 degrees C for 4 hours, independently ultrasonically dispersing cerium oxide nanoparticles and graphene oxide in dimethylformamide for 1 hour at room temperature, sequentially mixing the dispersions with the dissolved polyvinylidene fluoride solution, stirring at 600 rpm vigorously for 5 hours at room temperature to ensure molecular level dispersion of fillers within the polyvinylidene fluoride solution, and spreading homogeneous polyvinylidene fluoride/cerium oxide/graphene oxide dispersion in Teflon (RTM: polytetrafluoroethylene) Petri dish, drying at 60 degrees C for 5 hours, and peeling the composite film from the Petri dish. USE - Manufacture of polyvinylidene fluoride/cerium oxide/graphene oxide tertiary nanocomposite film used for sensing ammonia gas in residential area and automotive industry. ADVANTAGE - The method produces polyvinylidene fluoride/cerium oxide/graphene oxide tertiary nanocomposite film having enhanced ammonia gas sensing property even at room temperature. DETAILED DESCRIPTION - Manufacture of tertiary nanocomposite film involves mixing a graphite powder, sulfuric acid, and sodium nitrate in a round bottom flask under constant stirring in an ice bath at less than 10 degrees C, slowly adding potassium permanganate under stirring maintaining at 35 degrees C upon removing the ice bath under constant stirring for 2 hours until the mixture became brown, diluting the brown mixture with distilled water and maintaining at 98 degrees C for 1 hour until the color of the mixture changes from brown to yellow, reducing residual content of potassium permanganate by adding 30 ml of 30% hydrogen peroxide in a yellow mixture, centrifuging the mixture at 6000 rpm, washing repeatedly with distilled water until the pH became 7, drying the mixture at 60 degrees C for 24 hours to obtain a graphene oxide powder, preparing a polyvinylidene fluoride/cerium oxide/graphene oxide nanocomposite film using the graphene oxide powder by performing dissolution of required amount of polyvinylidene fluoride powder in dimethylformamide by heating the polyvinylidene fluoride powder at 70 degrees C for 4 hours, independently ultrasonically dispersing cerium oxide nanoparticles and graphene oxide in dimethylformamide for 1 hour at room temperature, sequentially mixing the dispersions with the dissolved polyvinylidene fluoride solution, stirring at 600 rpm vigorously for 5 hours at room temperature to ensure molecular level dispersion of fillers within the polyvinylidene fluoride solution, and spreading homogeneous polyvinylidene fluoride/cerium oxide/graphene oxide dispersion in Teflon (RTM: polytetrafluoroethylene) Petri dish, drying at 60 degrees C for 5 hours, and peeling the composite film from the Petri dish. An INDEPENDENT CLAIM is included for system (100) for manufacturing the tertiary nanocomposite film, which has a mixer (102) for mixing the graphite powder, sulfuric acid and sodium nitrate, a heating chamber (104) for drying the mixture to obtain the graphene oxide powder, an ultrasonic probe (106) mechanically attached with the heating chamber for dispersing the cerium oxide nanoparticles and graphene oxide, and a dispenser (108) for spreading the homogeneous polyvinylidene fluoride/cerium oxide/graphene oxide dispersion. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the system. System (100) Mixer (102) Heating chamber (104) Ultrasonic probe (106) Dispenser (108)