Preparation method of ultra-hydrophilic nano TiO2 thin film

Abstract

The invention discloses a preparation method of an ultra-hydrophilic nano TiO2 thin film. Tetrabutyl titanate is used as a precursor of TiO2, absolute ethyl alcohol is used as a dissolvent, acetylacetone as an inhibitor is added, and magnetic stirring is performed at the room temperature, so as to obtain a solution A; in addition, the absolute ethyl alcohol and deionized water are taken and added with a proper amount of PVP to obtain a solution B; under the strong stirring, the solution B is slowly dropped into the solution A, the pH value of a solution mixture is regulated to 3 by using acid, and stirring continuously lasts for 3 hours, so as to obtain stable TiO2 collosol, and the collosol is aged in 2-7 days for standby; a nano TiO2 thin film is prepared on a cleaned glass slide with a spin coater in a coating manner, the plated film is placed in a drying box for drying and then is subjected to thermal treatment and annealing, as a result, the ultra-hydrophilic nano TiO2 thin film is obtained, which has a smooth and uniform surface, is stable in the crystal type, and has no cranks; the contact angle between the surface of the thin film and water can reach 0 degree indoors; the nano TiO2 thin film has a very strong self-cleaning capacity.

Description

technical field [0001] The invention relates to the technical field of self-cleaning membranes, in particular to a superhydrophilic nano-TiO 2 The method of film preparation. Background technique [0002] TiO 2 As a photocatalytic material, it has the advantages of high chemical activity, strong oxidation ability, non-toxicity and no photocorrosion, and has been widely valued. where TiO 2 Films have great application value because they are not easy to agglomerate, can be reused, and are convenient for recycling. In addition, due to the nano-TiO 2 The film is hydrophilic, so it can be coated with TiO on the surface of glass, ceramics, mirrors, building materials, etc. 2 Coating can effectively improve its anti-pollution ability, which brings great convenience to people's daily environmental maintenance. [0003] However, nano-TiO prepared by the traditional sol-gel method 2 Generally, there are tiny cracks on the surface of the film, and the transparency is poor, and t...

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Problems solved by technology

[0003] However, nano-TiO prepared by the traditional sol-gel method 2 Generally, there are tiny cracks on the surface of the film, and the transparency is poor, and the adhesion is not strong. It can only show strong hydrophilicity under the irradiation of ultraviolet light or strong sunlight, which limits its application in daily life. application, and the contact angle between the existing film surface and water is about 5°

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