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Anatase titanium dioxide nano-rods and preparation method thereof

A technology of titanium dioxide and nano-titanium dioxide, which is applied in the field of nanomaterials, can solve the problems that electrode materials are not easy to collect electrons, limit the performance of photoelectrochemical devices, lack size and microscopic shape, etc., and achieve easy control of process parameters and high electron collection efficiency. , The effect of low production cost

Active Publication Date: 2015-07-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional titanium dioxide nanoparticles have a large number of grain boundaries in thin film electrodes, low electron diffusion coefficient, and short electron lifetime. Electrode materials prepared by traditional titanium dioxide nanoparticles are not easy to obtain high electron collection efficiency, which limits photoelectrochemical devices. performance
At the same time, the previously reported preparation process of titanium dioxide nanorods lacks precise control of the size and microscopic morphology of the rods, the quality is not high, and the general raw materials are relatively expensive, and the single-shot yield is low, which limits its industrial application prospects.

Method used

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  • Anatase titanium dioxide nano-rods and preparation method thereof
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  • Anatase titanium dioxide nano-rods and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0039] Fully mix 10mmol of isopropyl titanate with a small amount of ethylene glycol, slowly add the mixed solution to the mixed solution of ethylene glycol-water-ethanol containing 1.79ml tetrabutylammonium hydroxide solution, and finally keep the ethylene glycol in the reaction precursor The volume ratio of alcohol:water:ethanol is 15:1:14. Reflux with magnetic stirring for 1 hour under the condition of an oil bath at 85° C. until the reaction solution becomes completely clear. Then the reaction solution was transferred to a polytetrafluoroethylene hydrothermal kettle with a capacity of 100ml, reacted in an oven at 230°C for 24 hours, cooled to room temperature, centrifuged at 10,000 rpm, and washed 5 times with water and ethanol repeatedly. The coated film of the ethanol-wetted product was placed on a glass substrate, dried at 100°C for 30 minutes, and then heat-treated at 450°C for 1 hour. The specific surface area of ​​the product is 144.8m 2 / g, the product morphology is...

example 2

[0041] The specific process is the same as that in Example 1, except that the volume ratio of ethylene glycol:water:ethanol in the reaction precursor is finally kept at 1:1:0. The specific surface area of ​​the product is 105.5m 2 / g, the product morphology is as Figure 5 As shown, it shows that the aspect ratio or the orientation bonding growth mode can be controlled by adjusting the solvent ratio.

example 3

[0043] Fully mix 30mmol isopropyl titanate with a small amount of ethylene glycol, slowly add the mixed solution to the mixed solution of ethylene glycol-water containing 4.47ml tetramethylammonium hydroxide solution, and finally keep the ethylene glycol in the reaction precursor The volume ratio of alcohol:water is 1:1. Under the condition of an oil bath at 85° C., the mixture was magnetically stirred and refluxed for 3 hours until the reaction liquid became completely clear. Then the reaction solution was transferred to a polytetrafluoroethylene hydrothermal kettle with a capacity of 100ml, reacted in an oven at 230°C for 24 hours, cooled to room temperature, centrifuged at 8000 rpm, and washed repeatedly with water and ethanol for 5 times. The coated film of the ethanol-wetted product was placed on a glass substrate, dried at 100°C for 30 minutes, and then heat-treated at 450°C for 1 hour. The specific surface area of ​​the product is 57.0m 2 / g, the product morphology is...

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Abstract

The invention discloses anatase titanium dioxide nano-rods and a preparation method thereof. According to the invention, titanium alkoxide is adopted as a titanium source, an organic alkali is adopted as a glue solution, ethylene glycol-water or ethylene glycol-water-ethanol is adopted as a solvent; low-temperature glue solution is carried out, and then high-temperature hydrothermal reaction is carried out; and crystal growth is controlled in a manner of oriented bonding, such that the morphology of a final product is controlled in a special nano-rod shape. The oriented bonding direction is a (001) direction, and a crystal exposed surface is a {101} surface. With different reaction conditions, the diameters of the nano-rods are adjustable within a range of 5-60nm, and the lengths of the nano-rods are adjustable within a range of 50-400nm. According to the nano-rod growth process, a plurality of anatase grains are subjected to local bonding fusion according to a certain optimized direction through crystal lattice match sharing common crystal surfaces, such that the nano-rods with certain length-to-diameter ratio, good dispersion, and huge specific surface area is formed. With an electrode material prepared by using the nano-rods, higher electron collection efficiency can be easily obtained, and high photoelectric performance is provided.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to an anatase titanium dioxide nanorod and a preparation method thereof. Background technique [0002] Nano-titanium dioxide material is one of the most successful nanomaterials in commercial applications so far. Because of its non-toxic to human body, high chemical stability, absorption of ultraviolet light, and high refractive index, it is widely used in traditional fields such as cosmetics, coatings, chemical fibers, and plastics. In recent years, titanium dioxide has also made breakthroughs in emerging fields such as UV-resistant glass, self-cleaning glass, photocatalytic indoor air purification, and photocatalytic water pollution control. The latest research report shows that in the field of new energy that has attracted much attention, including dye-sensitized solar cells and quantum dot-sensitized solar cells, the most critical thing is the nano-titanium dioxide thin film ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B82Y40/00
Inventor 陈炜张文君谢艳曾宪伟熊德华王鸣魁程一兵
Owner HUAZHONG UNIV OF SCI & TECH
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