Preparation method of zinc sulfide (ZnS)/cadmium telluride (CdTe) quantum dot sensitization titanium dioxide (TiO2) nano film

A quantum dot sensitization, nano-film technology, applied in photosensitive equipment, semiconductor/solid-state device manufacturing, photovoltaic power generation, etc., can solve the problems of unstable quantum dots, no photocathode protection effect, low photoelectric efficiency of thin films, etc. Photogenerated cathodic protection effect, reduced defect density, improved crystallinity

CN102543457AInactive Publication Date: 2012-07-04XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-07-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of zinc sulfide (ZnS) / cadmium telluride (CdTe) quantum dot sensitization titanium dioxide (TiO2) nano film, and relates to a TiO2 nano film. The method comprises the following steps: preparing a titanium matrix sample, preparing a TiO2 nano-tube array film at the surface of the sample, preparing a CdTe quantum dot sensitization TiO2 nano film, and finally preparing a ZnS / CdTe quantum dot sensitization TiO2 nano film. Under irradiation of white light, the film enables an electrode potential of connected metals like stainless steel to be greatly reduced in corrosive medium, and can protect good cathode of metals like stainless steel continuously for a long time in a dark state. And the nano film prepared by using the method has an efficient photoproduction cathode protection effect.
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Description

technical field

[0001] The present invention relates to a kind of TiO 2 Nanofilms, especially involving a ZnS / CdTe quantum dot sensitized TiO 2 Preparation method of nano film. Background technique

[0002] Semiconductor titanium dioxide (TiO 2 ) has excellent photoelectrochemical properties, and has been widely used in solar cells, photocatalytic degradation of pollutants, and hydrogen production by photolysis of water. It was reported that when the TiO 2 The film is connected to the metal through the wire, and the photogenerated electrons generated are transferred to the metal surface through the wire, so that the electrode potential is lowered, and the metal can be cathodically protected, which is the so-called photogenerated cathodic protection. Therefore, TiO 2 The preparation of thin films and their application in metal corrosion control have attracted great attention of corrosion researchers.

[0003] Although in theory, photogenerated cathodic protection utiliz...

Examples

Embodiment 1

[0030] According to the above technical scheme (specific steps), prepare ZnS / CdTe quantum dot sensitized TiO 2 Nano film, and test the cathodic protection effect of the film as a photoanode on 403 stainless steel.

[0031] A rectangular pure titanium foil with a thickness of 0.1 mm is used as a sample, its length is 15 mm, and its width is 10 mm. After the surface of the sample was polished by No. 400-1500 water abrasive paper, it was ultrasonically cleaned in acetone, absolute ethanol and deionized water for 10 minutes respectively.

[0032] Weigh 4.5g NH 4 F, dissolve in 333mL deionized water, add 500mL glycerol, and mix well. At room temperature, using platinum as the counter electrode, anodize at 20V for 30min in the above solution. Then the sample was placed in a muffle furnace and calcined at 450 °C for 2 h and cooled to room temperature with the furnace, that is, TiO was prepared on the Ti surface. 2 nanotube array film.

[0033] Using the constant voltage pulse el...

Embodiment 2

[0041] According to the above technical scheme (specific steps), prepare ZnS / CdTe quantum dot sensitized TiO 2 Nano film, and test the cathodic protection effect of the film as a photoanode on 403 stainless steel.

[0042] A rectangular pure titanium foil with a thickness of 0.1 mm is used as a sample, its length is 10 mm, and its width is 10 mm. After the surface of the sample was polished by No. 400-No. 1500 water-grinding paper, it was ultrasonically cleaned in acetone, absolute ethanol and deionized water for 8 minutes respectively.

[0043] Weigh 4.5g of ammonium fluoride, dissolve it in 333mL of deionized water, add 500mL of glycerol, and mix well. At room temperature, using platinum as the counter electrode, anodize at 20V for 30min in the above solution. The samples were then calcined at 450 °C for 2 h in a muffle furnace and cooled to room temperature with the furnace.

[0044] Using the constant voltage pulse electrodeposition method, using the Autolab PGSTAT30 el...