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Method for fabricating porous TiO2 thin film by utilizing nano-crystalline TiO2 hydrosol

A technology of porous film and hydrosol, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of poor heat resistance and limitations, and achieve the effects of good dispersion, low equipment cost and simple operation

Active Publication Date: 2009-11-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional preparation methods are only limited to high-temperature-resistant substrate materials, and are limited to some substrates with poor heat resistance, especially the application of flexible conductive materials. Sensitized TiO with easy-to-dye characteristics such as bending 2 The industrial continuous production of nanocrystalline porous film electrodes has become an inevitable trend in the industrial application of solar cells
For example, Chinese patent CN1905215A discloses a low-temperature preparation of TiO by electrophoretic deposition. 2 The method of nanocrystalline porous thin film electrode, with the alcoholic solution of organotitanium source and TiO 2 Particle mixing, electrophoretic deposition, and low temperature TiO 2 For nanocrystalline porous films, the use of titanium alkoxide as a precursor requires strict control of reaction conditions, because titanium alkoxide is easily hydrolyzed in air, and the cost of titanium alkoxide also limits the wide application of this method

Method used

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  • Method for fabricating porous TiO2 thin film by utilizing nano-crystalline TiO2 hydrosol

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Dissolve titanium sulfate solid in water to form a 0.2M solution, add dropwise 3M ammonia water under stirring and adjust the pH value to 7.5-8.0 to obtain a white precipitate, which is then aged for 20 hours and then filtered and washed until the conductivity of the filtrate is less than 100μs / cm, then dissolve the resulting filter cake in water, ultrasonic for 0.5h, then add H 2 o 2 After the dropwise addition, the temperature was slowly raised to 100°C, and refluxed at 100°C for 4h. After the reaction was completed, the TiO 2 The sol was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, sealed, placed in an oven, and heated at 120°C for 15h to obtain TiO 2 Sol. At room temperature, the prepared TiO 2 The sol is coated on the cleaned indium-doped tin oxide (ITO) conductive glass, repeated several times, and dried at room temperature to obtain TiO 2 porous film.

Embodiment 2

[0025] Example 2: Dissolve the titanium sulfate solid in water to make a 0.2M solution, add dropwise 3M ammonia water under stirring and adjust the pH value to 7.5-8.0 to obtain a white precipitate, which is then aged for 10 hours and then filtered and washed until the conductivity of the filtrate is less than 100μs / cm, then dissolve the obtained filter cake in absolute ethanol, ultrasonic for 1h, and then dropwise add H 2 o 2 After the dropwise addition, the temperature was slowly raised to 78°C, and refluxed at 78°C for 6h. After the reaction was completed, the TiO 2 The sol was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, sealed, placed in an oven, and heated at 120°C for 15 hours. After the reaction was completed, it was filtered by suction and ultrasonically redispersed in water. At 80°C, it was sprayed Prepared TiO 2 The hydrosol is coated on a cleaned flexible conductive substrate polyethylene terephthalate / indium-doped tin oxide (PET...

Embodiment 3

[0026] Example 3: Dissolve the titanium sulfate solid in water to form a 0.1M solution, add dropwise 3M ammonia water under stirring and adjust the pH value to 7.5-8.0 to obtain a white precipitate, which is then aged for 18 hours and then filtered and washed until the conductivity of the filtrate is less than 100 μs / cm, and then the resulting filter cake was dissolved in a mixed solvent of water and ethanol with a volume ratio of 1:1, ultrasonicated for 1 h, and then added dropwise with stirring in an ice bath. 2 o 2 After the dropwise addition, the temperature was slowly raised to 90°C, and refluxed at 90°C for 5h. After the reaction was completed, the TiO 2 The sol was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, sealed, placed in an oven, and heated at 140 °C for 12 h. At room temperature, the prepared TiO 2 The sol is coated on the cleaned fluorine-doped tin oxide (FTO) conductive glass, repeated several times, and dried at room temperat...

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Abstract

The invention relates to a method for a fabricating porous TiO2 thin film by utilizing nano-crystalline TiO2 hydrosol, belonging to the technical field of fabrication process of inorganic metal oxide porous thin film. The fabricating steps of the method are as follows: (1), preparation of nano-crystalline TiO2 hydrosol: titanium salt used as raw material is complexed with ammonia water, extraction filtered, washed, and dissolved in different solvents, and then H2O2 is added thereinto to dissolve colloid to obtain different crystallization results; the sol is transferred to a high-pressure reaction kettle, crystallized for 8-15 hours at temperature of between 100 and 200 DEG C, and extraction filtered and ultrasonic dispersed in water to obtain nano-crystalline TiO2 hydrosol; (2), fabrication of the porous TiO2 thin film: the porous thin film is obtained by directly coating the hydrosol onto a matrix at low temperature. The TiO2 hydrosol prepared by the invention has high crystallization degree, good dispersity, and controllable sol shape; surface of the porous thin film is flat and even with good adhesion. The porous TiO2 thin film can be applied to fields of photocatalysis, photodetector and solar battery and the like.

Description

technical field [0001] The present invention relates to a kind of TiO 2 Preparation of TiO by Nanocrystalline Hydrosol 2 The invention discloses a porous film method, which belongs to the technical field of inorganic metal oxide porous film preparation technology. Background technique [0002] TiO 2 With its unique excellent performance, it has shown broad application prospects in the fields of electronic sensing, solar cells and environmental catalysis. with TiO 2 powder compared to porous TiO 2 Due to its high specific surface area and high porosity, the film can effectively absorb the decomposed substances and increase the TiO 2 Contact with the decomposed matter, thereby improving the efficiency of photocatalytic decomposition; and dye-sensitized porous TiO 2 The film is conducive to the adsorption of a large number of dye molecules, improving the light energy absorption efficiency of the battery, and at the same time facilitating the transmission of electrons in t...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 施利毅袁帅廖建华方建慧赵尹
Owner SHANGHAI UNIV
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