Homogeneous nanocrystal modified TiO2 nanotube array and preparation method thereof

A nanotube array, nanocrystal technology, applied in nanotechnology, chemical instruments and methods, crystal growth, etc., can solve problems such as increasing the recombination probability of electrons and holes, and reducing the degradation efficiency of organic matter.

Active Publication Date: 2015-11-18
黄山市开发投资集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 The length of the nanotube array determines the TiO 2 specific surface area, but TiO 2 If the length of the nanotube array film is greater than the length required for electron transport, the probability of recombination of electrons and holes will increase, resulting in a decrease in the degradation efficiency of organic matter

Method used

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  • Homogeneous nanocrystal modified TiO2 nanotube array and preparation method thereof
  • Homogeneous nanocrystal modified TiO2 nanotube array and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this example, homogeneous nanocrystalline modified TiO 2 The preparation process of the nanotube array is as follows:

[0019] (1) After the surface of the titanium foil is thoroughly cleaned, it is anodized to form TiO on the surface of the titanium foil substrate. 2 Nanotube array, the electrolyte used is containing 0.3mol / LNH 4 For the ethylene glycol solution of F, the oxidation voltage is 60V, and the oxidation time is 10h.

[0020] (2) TiO obtained in step (1) 2 Anatase TiO can be obtained by calcining and crystallizing nanotube arrays at 500°C for 2 hours 2 array of nanotubes.

[0021] (3) configure TiO 2 Sol precursor solution: titanium tetrachloride (TiCl 4 ) and urea are mixed in ethanol at a molar ratio of 1:2, so that the concentration of titanium tetrachloride is 10vol%.

[0022] (4) the crystallized TiO obtained in step (2) 2 Nanotube array obtained in step (3) TiO 2 Immerse in the sol precursor solution for 10min, the temperature of the water ...

Embodiment 2

[0028] The preparation method of this embodiment is the same as that of Example 1, except that the soaking time in step (4) is changed to 30min.

[0029] After testing, the homogeneous nanocrystalline modified TiO prepared according to the above steps 2 Nanotube array at 48mW / cm 2 Under the irradiation of ultraviolet light, the photocurrent is 254μA, which is about the same as that of ordinary TiO 2 5 times the photocurrent of NTAs.

Embodiment 3

[0031] The preparation method of this embodiment is the same as that of Example 1, except that the soaking time in step (4) is changed to 60min.

[0032] After testing, the homogeneous nanocrystalline modified TiO prepared according to the above steps 2 Nanotube array at 48mW / cm 2 Under the irradiation of ultraviolet light, the photocurrent is 173μA, which is about the same as that of the undeposited nanocrystalline TiO 2 3.5 times the photocurrent of NTAs.

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Abstract

The invention discloses a homogeneous nanocrystal modified TiO2 nanotube array and a preparation method thereof. The homogeneous nanocrystal modified TiO2 nanotube array and the preparation method thereof is characterized in that TiO2 nanocrystals of a single-crystal structure grow in a depositing mode on the inner walls of all TiO2 nanotubes forming a TiO2 nanotube array. When the preparation is conducted, firstly, TiO2 colloid particles are deposited on the surface of the TiO2 nanotube array by adopting a sol-dipping method; then the colloid particles in the TiO2 nanotube array are converted into the nanocrystals through a solvent thermal treatment process, accordingly, the homogeneous nanocrystal modified TiO2 nanotube array is obtained. According to the homogeneous nanocrystal modified TiO2 nanotube array and the preparation method thereof, the homogeneous nanocrystals of the single-crystal structure grow on the inner walls of the nanotubes of the TiO2 nanotube array, so that the TiO2 nanotube array has a larger specific surface area and higher surface reaction activity compared with an original TiO2 nanotube array. Therefore, higher photoelectric conversion efficiency and higher photocatalysis and photoelectrochemistry activity are shown.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, photocatalysis and photoelectric conversion, in particular to a homogeneous nanocrystal modified TiO 2 Nanotube arrays to enhance their photocatalytic performance. Background technique [0002] TiO 2 Due to their excellent physical and chemical properties, nanomaterials are widely used in the fields of photocatalytic degradation of organic matter, photolysis of water, and fuel-sensitized solar cells. where TiO 2 Nanotube arrays have excellent light absorption properties and low electron recombination probability, making them better than zero-dimensional TiO 2 Nanoparticle films are more suitable for the field of photoelectrocatalysis. However, there are still some problems that seriously restrict the TiO 2 Further applications of nanotube arrays. TiO 2 The specific surface area of ​​the nanotube array is small, however, the increase of the specific surface area will effectively impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C30B5/00C30B29/16B82Y40/00
Inventor 徐光青王金文张旭吕珺吴玉程
Owner 黄山市开发投资集团有限公司
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