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Preparation of Sandwich-Like TiO2/Graphene/TiO2 Films and its Application in Photocatalysis

Anatase nano-TiO2 film was prepared by sol-gel method and graphene oxide nanosheets synthesized by Hummers method were deposited on this TiO2 thin film. Another nano-TiO2 film was then deposited on the graphene film forming sandwich-like to avoid graphene layer peeled off. Scanning electron microscope shows that TiO2 particles layer with a diameter of about 20 nm were densely and uniformly deposited on both surfaces of the graphene layer to form a sandwich-like composite structure. The composite films exhibit excellent photocatalytic degradation to methyl orange and remains chemically stable in the whole process without anything exfoliation.