▎ 摘　　要

NOVELTY - Titanium dioxide-graphene multilayer structure, comprises graphene layer and titanium dioxide layer, that are alternately stacked with each other. USE - Titanium dioxide-graphene multilayer structure used in intake system of gasoline diesel engine and air filter (claimed). ADVANTAGE - The titanium dioxide-graphene multilayer structure used in intake system of gasoline diesel engine and air filter that improve the filtering effect, and catalyzing and air purifying effect, improves the combustion efficiency of the air and save oil. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparing titanium dioxide-graphene multilayer, which involves depositing chemical vapor deposition (CVD) graphene layer on a copper substrate; removing the metal copper substrate to obtain titanium dioxide-graphite; and removing the metal-copper substrate on the titanium dioxide layer as necessary to obtain multilayer structure; (2) method for specific operation, which involves pretreating copper substrate, polishing, ultrasonic cleaning, drying; introducing helium and hydrogen, maintaining the gas pressure at 100-500 Pascals, where the flow rate of hydrogen is 100-500 system center configuration manager and the flow rate of helium is 100-1000 system center configuration manager, the copper substrate is in the range of 100-500 system center configuration manager; increasing the temperature to 900-1000 degrees C and maintaining the temperature for 20-40 minutes, passing a certain proportion of hydrogen and methane (or acetylene) to keep the air pressure at 100-500 Pascals and continue to ventilate until the growth of graphene is completed; stopping heating, cooling to room temperature, removing the copper substrate and graphene; and (3) method for removing the copper substrate from titanium dioxide-graphene multilayer structure, which involves mixing the prepared titanium dioxide-graphene multilayer structure with copper; suspending the substrate; placing in the etching solution; immersing in the solution liquid surface until the copper substrate is completely etched; and removing titanium dioxide-graphene multilayer structure, washing with deionized water and drying.