Macro pore/meso pore TiO2 film with high double ordered structure and preparation method thereof

Abstract

The invention provides a macro pore / meso pore TiO2 film with high double ordered structure and a preparation method thereof. The method comprises the following steps: preparing monodispersed polystyrene spheres; then arranging the polystyrene spheres on a glass slide to form a close-packed opal structure through evaporation, induction and self assembly, thus preparing a polystyrene sphere colloidal crystal template; placing the template in a Ti precursor sol and preparing a composite film by a soaking-pulling method; and finally removing organic matters through thermal treatment, thus obtaining the macro pore / meso pore TiO2 film. The macro pore / meso pore TiO2 film provided by the method has high double orderliness; by virtue of the control on the grain diameter and uniformity of the polystyrene spheres, the selection of surfactants and the control over soaking-pulling and thermal treatment conditions, the regulation and control over the size and orderliness of the macro pores and meso pores of the film are realized; and by virtue of the synergetic effect of the macro pores and the meso pores, the photocatalysis efficiency of materials is greatly improved. The method provided by the invention has the advantages of simplicity and convenience in operation, high controllability and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a TiO with a multi-level ordered pore structure. 2 Thin films and methods for their preparation. Background technique [0002] TiO 2 It is an N-type semiconductor material that generates electrons and holes under the irradiation of ultraviolet light. It has a strong redox ability and has a wide range of applications in photocatalysis, gas sensors, and solar energy conversion. Due to the increasingly severe environmental pollution problems in recent years, photocatalytic degradation technology has attracted much attention. TiO 2 It has the advantages of high activity, chemical stability, light corrosion resistance, insoluble, non-toxic, cheap and easy to obtain, and can not only completely oxidize organic pollutants into CO 2 、H 2 O or other inorganic substances, and the photocatalytic reaction can be carried out at room temperature, so TiO 2 It is c...

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Problems solved by technology

But the denser TiO 2 When the mesoporous thin film material participates in the photocatalytic reaction, due to the compactness of the film, the reaction mainly occurs on the surface of the film, while the mesoporous TiO inside the film 2 It is difficult to access the reactants, so that the photocatalytic efficiency cannot be further improved

macroporous TiO 2 Although the thin film has good fluidity, due to its small specific surface area, it can provide fewer photocatalytic reaction sites, and the adsorption capacity of reactants is poor, and the photogenerated electron holes are easy to flow due to the thick pore wall. Recombination and other factors have not become the focus of research in the field of photocatalysis

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