Method for preparing nano crystal TiO2 porous film using high viscosity solvent

Abstract

The present invention discloses method of preparing porous nanometer crystal TiO2 film in high viscosity solvent. Inside mixed solvent of anhydrous alcohol and high viscosity reagent terpineol or inside solvent of high viscosity reagent decyl alcohol, butyl titanate as precursor and complexing agent NH(C2H5OH)2 are added, mixed water and ethanol solvent is dropped, and template agent PEG is added via strong stirring to form sol; and through further sol pre-treatment, soaking-drawing film coating and calcining, porous nano crystal TiO2 film is prepared. The said process has increased film thickness, raised apparatus utilization, raised regularity and orderliness of pore structure and increased specific surface area of film. The porous nano crystal TiO2 film may be used widely in photocatalysis, electrochromism, chemical sensitive device, solar cell, etc.

Description

technical field [0001] The present invention relates to solar cell nanocrystalline TiO 2 Method for the preparation of porous films, especially regarding the preparation of nanocrystalline TiO using high viscosity solvents 2 Preparation method of porous film. Background technique [0002] Nanocrystalline TiO 2 Porous thin films are widely used in photocatalysis, electrochromism, chemical sensitive devices and solar cells due to their large specific surface area and excellent photoelectrochemical properties. [0003] In the preparation of oxide films, the sol-gel method is favored by people because of its simple process, low equipment requirements, suitable for large-area preparation, and especially the easy control of chemical dosage ratio. On the other hand, since the volatilization of the solvent phase and the removal of organics will leave abundant pores in the material, the sol-gel method is also considered to be an effective method for ...

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Problems solved by technology

However, the regularity and arrangement order of the porous structure of the film are low, resulting in a small specific surface area of ​​the film.

[0004] Preparation of nanocrystalline TiO by sol-gel method 2 The main disadvantages of porous films are: (1) The thickness of a single film is small, and the deposition process needs to be repeated many times to increase the film thickness, thereby reducing the preparation efficiency; (2) Although the addition of high-viscosity organic matter in the sol can increase Large film thickness, but at the same time, it also inhibits the formation of porous structure to a certain extent, resulting in a decrease in the regularity and order of the pore structure, and a decrease in the specific surface area of ​​the film

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