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Method for preparing oriented tungstic trioxide nano-film

A tungsten trioxide and nano-film technology, applied in the field of nanotechnology and new materials, can solve the problems of high cost, low orientation, low crystallinity, etc.

Inactive Publication Date: 2008-12-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the obtained thin film materials are non-oriented, and a few reported results have a tendency to grow preferentially along the [020] or [200] direction, but the orientation is not high and the crystallinity is low
So far, there is no relevant literature report on the tungsten trioxide film along the [002] orientation.
In addition, the above-mentioned developed methods for preparing tungsten oxide thin film materials often require special equipment or equipment with special requirements, which are costly and poorly adaptable.

Method used

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  • Method for preparing oriented tungstic trioxide nano-film
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  • Method for preparing oriented tungstic trioxide nano-film

Examples

Experimental program
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Embodiment 1

[0021] Take about 20mg of tungsten trioxide (WO 3 ) nanosheets were added to 20ml of absolute ethanol solution, and after ultrasonication for 5min, continued magnetic stirring for 30min to obtain light yellow tungsten trioxide (WO 3 ) nanosheet suspension; take 50 μl of tungsten trioxide (WO 3 ) nanosheet suspension was added dropwise on a horizontally placed copper grid (copper grid used for transmission electron microscope observation); placed in the air for 15min, after the solvent evaporated, repeat the above dripping process; ” The film obtained after the process is as figure 2 shown. It can be found that tungsten trioxide (WO 3 ) nanosheets are evenly placed on the copper grid, and the nanosheets in most areas are double or triple overlapped, while some areas do not have tungsten trioxide (WO 3 ) covered by nanosheets; a single tungsten trioxide (WO 3 ) Selected area electron diffraction patterns of nanosheets such as image 3 Shown, indicating that tungsten triox...

Embodiment 2

[0024] Take about 40 mg of nanosheets and add them to 20 ml of absolute ethanol solution, and after ultrasonication for 5 minutes, continue magnetic stirring for 60 minutes to obtain light yellow tungsten trioxide (WO 3 ) nanosheet suspension; adopt X-ray diffraction to prepare tungsten trioxide (WO 3 ) nano-film substrate, before use, the glass sheet was washed successively with hydrochloric acid, distilled water, acetone, and dried; take 100 μl of tungsten trioxide (WO 3 ) nanosheet suspension was added dropwise on the pre-washed glass plate placed horizontally; placed at room temperature for 30min, after the solvent volatilized, repeat the above drop process; the above "drop-volatilization" process was repeated 10 times and then shallow Yellow tungsten trioxide (WO 3 ) nano film. Figure 6 The resulting tungsten trioxide (WO 3 ) X-ray diffraction line of nano film sample, for convenience comparison, used tungsten trioxide (WO 3 ) X-ray diffraction spectrum of the nanosh...

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Abstract

The invention relates to a method for preparing an orientated tungsten oxide nano film. The method takes an ethanol suspension of monocrystal tungsten trioxide (WO3) nano-plates as a precursor, and utilizes the habit that the nano-plate with high diameter-thickness ratio tends to be parallel to a substrate and the principle that solvent volatilization causes the oriented self-assembly of the nano-plate to prepare the tungsten oxide (WO3) nano film which is formed by overlapping the tungsten trioxide (WO3) nano-plates and oriented along the [002] crystallographic direction. The method is completed at a room temperature, and does not require subsequent heating treatment; and the tungsten trioxide (WO3) nano film prepared is strongly oriented along the [002] crystallographic direction, namely the WO3 nano film is spread along an ab plane and a c- shaft is the film thickness direction. The method has the characteristics of simple technological process, convenient operation, low requirements on equipment conditions and strong adaptability; and WO3 nano film materials have the characteristics of high crystallinity and good orientation.

Description

technical field [0001] The invention relates to a preparation method of an oriented tungsten trioxide nano film, which belongs to the field of nanotechnology and new materials. Background technique [0002] Tungsten oxide thin film materials have excellent photochromic, electrochromic, and gasochromic properties, and have important applications in flat panel displays, smart windows, and chemical sensing. In addition, tungsten oxide thin film materials have a narrow band gap (2.5eV) and can absorb visible light with a wavelength less than 500nm in the solar spectrum. Therefore, tungsten oxide and tungsten oxide-based thin film materials are widely used in the fields of solar energy utilization and visible light catalysis prospect. Commonly used methods for preparing tungsten oxide thin film materials include: atomic layer deposition (J.Amer.Chem.Soc., 2006, 128, 9638.), chemical vapor deposition (J.Amer.Chem.Soc., 2006, 128, 1587; Chem.Mater., 2003, 15, 2786; 1999, 11, 314....

Claims

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Application Information

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IPC IPC(8): C01G43/01C03C17/25C04B41/85B82B3/00
Inventor 陈德良张锐王海龙卢红霞许红亮
Owner ZHENGZHOU UNIV
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