Niobium-doped titanium dioxide coated glass and preparation method thereof

Abstract

The invention discloses a preparation method of a niobium-doped titanium dioxide coated glass. The preparation method adopts a chemical vapor deposition method, and comprises the following steps of (1) mixing a titanium source and a niobium source, so as to obtain a source material mixture; or, mixing the titanium source, the niobium source and a solvent, so as to obtain the source material mixture; (2) converting the source material mixture into vapor-phase reaction gas by an air bubbling or evaporating and gasifying method; (3) carrying the vapor-phase reaction gas to the pretreated high-temperature glass substrate by carrying gas, reacting, and depositing, so as to obtain the niobium-doped titanium dioxide coated glass. The prepared niobium-doped titanium dioxide coated glass has the advantages that the bonding force of a film layer is excellent, and the physical stability and chemical stability are good; the thin film is made of anatase-phase titanium dioxide, and the mass concentration of the niobium-doped material is 0.5 to 15%; the photo-induced super-hydrophilicity is realized; the niobium-doped titanium dioxide coated glass is prepared at high temperature, and is suitablefor the low-cost preparation of large-area coated film; the cleaning is easy, and the stain-resistant property is realized.

Description

technical field [0001] The invention belongs to the field of preparation and application of large-area coated glass for building, and in particular relates to the preparation and application of coated glass with easy-cleaning and self-cleaning functions. Background technique [0002] TiO 2 It is a wide bandgap semiconductor, and its bandgap width is generally 3.0-3.2eV. Sunlight strikes TiO 2 Surface, TiO 2 Absorbing photon energy, electrons in the valence band transition to the conduction band, react with oxygen molecules in the air, and generate superoxide ion radicals (O 2 - ). The holes left by the valence band react with water molecules to generate hydroxyl radicals (·OH). o 2 - and OH participate in the decomposition reaction of organic matter, thus exhibiting photocatalytic activity. TiO 2 It also exhibits superhydrophilicity under light. Photogenerated holes are covered by lattice TiO 2 Oxygen is captured, forming oxygen vacancies, and the electrons will ...

AI Technical Summary

Problems solved by technology

[0003] Traditional preparation of TiO 2 Coated glass mostly adopts the sol-gel method. The precursor is spread on the glass substrate in the form of sol. After subsequent heating treatment, solvents, inorganic and organic reaction products, etc. are removed, and anatase phase or rutile phase film is obtained through the crystallization process. , this method is not suitable for large-scale continuous production

At present, continuous production of TiO 2 The chemical vapor deposition method used in the coated glass uses the titanium metal organic source to obtain the reaction gas through evaporation. If doping is required, a second reaction gas source is configured, and the compatibility with the original process is low.

[0004] Patent CN101538125B discloses a preparation method of superhydrophilic self-cleaning glass, which uses liquid phase deposition method to deposit TiO with photoinduced superhydrophilicity on the glass surface 2 membrane, but the raw material contains hydrofluoric acid, which is highly toxic and pollutes the environment seriously, so it is not suitable for large-scale industrialization

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