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Method for preparing composite film of silver Nano granule / titanium dioxide

A technology of titanium dioxide and composite thin film, which is applied in liquid chemical plating, semiconductor/solid-state device manufacturing, coating and other directions, can solve the problem of staying silver content and other problems, achieve good photocatalytic performance and electrical conductivity, and the method and equipment are simple. Effect

Inactive Publication Date: 2007-02-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Ag ions are easily deposited on TiO 2 The sol is precipitated and precipitated, so that the research work on silver-doped or silver-composite titanium dioxide has been stuck in a state of low silver content (Ag atomic percentage At%<2)

Method used

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  • Method for preparing composite film of silver Nano granule / titanium dioxide
  • Method for preparing composite film of silver Nano granule / titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Mix butyl titanate and ethanol in a container at a molar ratio of 1:6, put the container in an ice-water bath and stir for 30 minutes to obtain liquid A,

[0018] 2) Mix water, diethanolamine, ethanol and silver nitrate powder in a molar ratio of 1:1:12:0.6 and keep stirring until the silver nitrate is completely dissolved to obtain liquid B.

[0019] 3) Add liquid B drop by drop into liquid A which has been placed in an ice-water bath, and then continue to stir until a sol with stable color is obtained, and then age the sol at 4°C for use;

[0020] 4) Immerse a clean quartz glass sheet in the above sol and pull it. The pulling speed is controlled at 2cm / min. After each layer is pulled, it is heat-treated at 450°C for 30min to obtain Ag / TiO 2 film.

[0021] The prepared Ag / TiO 2 The XRD pattern of the film is as figure 1 As shown, the film is composed of titanium dioxide in anatase phase and metallic silver. Ag / TiO 2 The BSE photo of the membrane is as figure ...

Embodiment 2

[0023] 1) Mix titanium chloride and ethylene glycol methyl ether in a container at a molar ratio of 1:15, put the container in an ice-water bath and stir for 30 minutes to obtain liquid A,

[0024] 2) Mix water, citric acid, ethylene glycol methyl ether and silver nitrate powder in a molar ratio of 1:0.1:18:1.5 and keep stirring until the silver nitrate is completely dissolved to obtain liquid B.

[0025] 3) Add liquid B dropwise into liquid A which has been placed in an ice-water bath, and then continue to stir until a sol with stable color is obtained, and then age the sol at -4°C for use;

[0026] 4) Immerse a clean ordinary glass sheet in the above sol and pull it. The pulling speed is controlled at 8cm / min. After each layer is pulled, it is heat-treated at 600°C for 10 minutes to obtain Ag / TiO 2 film.

[0027] The prepared Ag / TiO 2 The content At% of Ag in the film was 10.36.

Embodiment 3

[0029] 1) Mix isopropyl titanate and propylene glycol methyl ether in a container at a molar ratio of 1:4, put the container in an ice-water bath and stir for 30 minutes to obtain liquid A,

[0030] 2) Mix water, polyethylene glycol, propylene glycol methyl ether and silver nitrate powder in a molar ratio of 1:0.5:6:0.2 and keep stirring until the silver nitrate is completely dissolved to obtain liquid B.

[0031] 3) Add liquid B drop by drop into liquid A which has been placed in an ice-water bath, and then continue to stir until a sol with stable color is obtained, and then age the sol at 20°C for use;

[0032] 4) Immerse the clean ceramic sheet in the above sol and pull it. The pulling speed is controlled at 2cm / min. After each layer is pulled, it is heat-treated at 500°C for 30min to obtain Ag / TiO 2 film.

[0033] The prepared Ag / TiO 2 The content At% of Ag in the film was 3.64.

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Abstract

This invention discloses a method for preparing Ag / TiO2 composite film. The method coprises: (1) dissolving Ti compound in an organic solvent to obtain solution A; (2) mixing water, complexing agent, organic solvent and AgNO3 powder to obtain solution B; (3) dropping solution B into solution A, and strring to obtain a stable sol; (4) coating the sol onto a clean carrier by soaking and drawing, and treating at 450-600 deg.C to obtain Ag / TiO2 film. The method and equipment in this invention is simple. The content of Ag in the film is high, thus the obtained Ag / TiO2 film has good photocatalytic performance and high conductivity.

Description

technical field [0001] The invention relates to a method for preparing a silver nano particle / titanium dioxide composite thin film. Background technique [0002] Metal oxide semiconductor titanium dioxide (TiO 2 ) is a wide bandgap semiconductor material with a bandgap width of about 3.2-3.41eV, transparent in the wavelength range of 0.35-12μm, high refractive index, and has the characteristics of high mechanical properties and stable chemical properties. TiO in the UV band 2 With photocatalytic properties, in many photocatalysts (TiO 2 , ZnO, Fe 2 o 3 , CdS, etc.), TiO 2 It is valued by people because of its non-toxic, high catalytic activity, good stability, cheap and easy to get. Use it to photocatalytically degrade organic pollutants in water, and finally generate non-toxic and tasteless CO 2 , H 2 O and some simple inorganic substances. But TiO 2 It can only absorb light in the ultraviolet band, making its photocatalytic efficiency low under daily conditions. ...

Claims

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Application Information

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IPC IPC(8): C23C18/02H01L21/20
Inventor 赵高凌李红韩高荣
Owner ZHEJIANG UNIV
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