Method for fabricating porous TiO2 thin film by utilizing nano-crystalline TiO2 hydrosol
A porous film and hydrosol technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of poor heat resistance and limitation, and achieve the effects of good dispersion, low equipment cost and simple operation.
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Embodiment 1
[0024] Example 1: Dissolve titanium sulfate solid in water to make a 0.2M solution, add 3M ammonia water dropwise with stirring and adjust the pH to 7.5-8.0 to obtain a white precipitate. After aging for 20 hours, it is suction filtered and washed until the conductivity of the filtrate is less than 100μs / cm, then dissolve the resulting filter cake in water, ultrasound for 0.5h, and then add H dropwise with stirring in an ice bath 2 O 2 After the addition, the temperature is slowly raised to 100°C, and refluxed at 100°C for 4h. After the reaction, the TiO 2 The sol was transferred to a stainless steel autoclave lined with PTFE, sealed, placed in an oven, and heated at 120°C for 15 hours to obtain TiO 2 Sol. At room temperature, spin-coating the prepared TiO 2 The sol is coated on 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 titanium sulfate solid in water to make a 0.2M solution, add 3M ammonia water dropwise with stirring and adjust the pH to 7.5-8.0 to obtain a white precipitate. After aging for 10 hours, the filtrate is filtered and washed until the conductivity of the filtrate is less than 100μs / cm, then dissolve the resulting filter cake in absolute ethanol, sonicate for 1h, and then add H dropwise with stirring in an ice bath 2 O 2 After the addition, the temperature is slowly raised to 78°C, and refluxed at 78°C for 6h. After the reaction, the TiO 2 The sol was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, sealed, placed in an oven, heated at 120°C for 15h, after the reaction, filtered, ultrasonically re-dispersed in water, at 80°C, sprayed TiO 2 The hydrosol is coated on the cleaned flexible conductive substrate polyethylene terephthalate / indium-doped tin oxide (PET / ITO) and dried at room temperature to obtain TiO 2 Porous film.
Embodiment 3
[0026] Example 3: Dissolve titanium sulfate solid in water to make a 0.1M solution, add 3M ammonia water dropwise with stirring and adjust the pH to 7.5 to 8.0 to obtain a white precipitate. After 18 hours of static aging, filter and wash until the conductivity of the filtrate is less than 100μs / cm, and then dissolve the obtained filter cake in a mixed solvent of water and ethanol with a volume ratio of 1:1, ultrasound for 1h, and then add H dropwise with stirring in an ice bath 2 O 2 After the addition, the temperature is slowly raised to 90°C, and refluxed at 90°C for 5h. After the reaction, the TiO 2 The sol was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, sealed, placed in an oven, heated at 140°C for 12h, and at room temperature, the prepared TiO 2 The sol is coated on cleaned fluorine-doped tin oxide (FTO) conductive glass, repeated several times, and dried at room temperature to obtain TiO 2 Porous film.
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Abstract
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