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Strontium titanate-titanium dioxide composite nanotube array film and preparation method and application thereof

A nanotube array and titanium dioxide technology, which is applied in the field of semiconductor nanocomposite material preparation, can solve the problems of easy recombination of excited charges and large band gap, and achieve simple adjustment of reaction temperature and time, high selectivity, and mild synthesis process Effect

Active Publication Date: 2017-02-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of titanium dioxide’s large band gap and easy recombination of excited charges, two technical problems must be solved: (1) The band gap (~3.2eV) of titanium dioxide determines that it can only be excited by ultraviolet light less than 380nm, while The energy of ultraviolet light less than 380nm only accounts for about 5% of the solar radiation reaching the earth's surface, so it is necessary to broaden the response range of titanium dioxide to the spectrum and improve the utilization rate of solar energy, especially in the visible region; (2) The rapid recombination between charge carriers leads to The quantum yield is usually not higher than 20%, which makes the actual utilization rate of solar energy only about 1%, so improving the effective separation of photogenerated electrons and hole pairs and inhibiting recombination are also necessary means to improve the photoelectric conversion efficiency of titanium dioxide

Method used

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  • Strontium titanate-titanium dioxide composite nanotube array film and preparation method and application thereof
  • Strontium titanate-titanium dioxide composite nanotube array film and preparation method and application thereof
  • Strontium titanate-titanium dioxide composite nanotube array film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Using n-butyl titanate as the titanium source precursor, concentrated hydrochloric acid as the etchant, and strontium hydroxide solution as the strontium source, the strontium titanate-titanium dioxide composite nanotube array film was prepared by hydrothermal method. The operation steps are as follows:

[0026] (1), prepare hydrochloric acid with a concentration of 36.5% and deionized water according to the volume ratio of 1:6, 1:4, 1:2, 1:1, 2:1, 4:1, 6:1 respectively 30mL of the mixed solution was stirred with a magnetic stirrer for 5min, and then 0.6mL of n-butyl titanate was added thereto, and after stirring for 15min, a transparent and clear solution was obtained, which was used as a reaction solution for use;

[0027] (2) Take a piece of FTO (fluorine-doped tin oxide) conductive glass, tilt it into the autoclave with the conductive side facing down, pour the reaction solution into the autoclave, put it in an oven for 4 hours at 150°C for hydrothermal reaction, and...

Embodiment 2

[0037](1), after stirring 15mL 36.5% concentrated hydrochloric acid and 15mL deionized water with a magnetic stirrer for 5min, add 0.1mL, 0.2mL, 0.4mL, 0.6mL, 0.8mL, 1.0mL of n-butyl titanate respectively, After stirring for 15 minutes, a transparent and clear solution was obtained, which was used as a reaction solution;

[0038] Steps (2)~(6) are the same as in Example 1;

[0039] (7) After the reaction, cool down to room temperature with the furnace, take out the porcelain boat, and obtain strontium titanate-titanium dioxide composite nanotube array films prepared with different amounts of n-butyl titanate in the reaction substrate during the first hydrothermal reaction , and keep away from light.

Embodiment 3

[0041] (1) After stirring 15mL of 36.5% concentrated hydrochloric acid and 15mL of deionized water with a magnetic stirrer for 5 minutes, add 0.6mL of n-butyl titanate to it, and after stirring for 15 minutes, a transparent and clear solution was obtained, which was used as a reaction solution for use;

[0042] (2) Take a piece of FTO conductive glass, put it into the autoclave obliquely, with the conductive side down, transfer all the reaction solution into the autoclave, put it into the oven at 80°C, 120°C, 150°C, 180°C , hydrothermal reaction at 210°C and 240°C for 4 hours. After the reaction is completed, take out the autoclave, cool it down to room temperature naturally, take out the FTO conductive glass, rinse it with deionized water, and dry it for use;

[0043] Steps (3)~(6) are the same as in Example 1;

[0044] (7) After the reaction, cool down to room temperature with the furnace, take out the porcelain boat, and obtain strontium titanate-titanium dioxide composite ...

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Abstract

The invention relates to a strontium titanate-titanium dioxide composite nanotube array film and a preparation method and application thereof. The film is obtained through direct growth on a conductive glass substrate with a three-step hydrothermal method; hydrothermal synthesis of titanium dioxide nanorods is carried out in the first step, the titanium dioxide nanorods are etched to generate titanium dioxide nanotubes in the second step of hydrothermal treatment, strontium hydroxide serves as a strontium source in the third step of hydrothermal reaction, and finally the composite film with perovskite type strontium titanate nanoparticles uniformly distributed on the surface of the titanium dioxide nanotube array is obtained, wherein the titanium dioxide nanotubes are vertically arrayed on the conductive glass substrate. The composite film can serve as an anode material of solar cells or serve as a photocatalyst for degradation treatment of photolysis water or organic matter. The three-step hydrothermal method is adopted for in-situ synthesis, the preparation process and needed equipment are simple, the controllability is high, and production is safe, free of toxin and environmentally friendly; by assembling the film into solar cells, the sunlight capturing capability of photoanodes can be improved, and the photoelectric conversion efficiency can be improved.

Description

[0001] Technical field: [0002] The invention relates to a strontium titanate-titanium dioxide composite nanotube array film with a special microscopic structure and its preparation method and application, which belongs to the technical field of semiconductor nanocomposite material preparation and can be applied to solar cell photoanodes or photocatalysts to degrade dye sewage . [0003] Background technique: [0004] With the escalation of energy and environmental issues, people's demand for new energy is also increasing. As a green energy with huge reserves, solar energy has become a hot research field for its utilization and transformation. New environmentally friendly semiconductor composite materials are in line with the development of the current era and have attracted much attention. The development and utilization of environmentally friendly semiconductor composite materials is important for the sustainable development of human beings. It has important economic and so...

Claims

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Application Information

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IPC IPC(8): C03C17/34H01G9/20H01G9/042B82Y40/00
CPCH01G9/2022B82Y40/00C03C17/006C03C17/3417C03C2217/94C03C2217/40Y02E10/542
Inventor 孙琼洪永刘秋红董立峰
Owner QINGDAO UNIV OF SCI & TECH
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