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Method for preparing tungsten trioxide nano material

A nanomaterial, tungsten trioxide technology, applied in nanostructure manufacturing, tungsten oxide/tungsten hydroxide, nanotechnology, etc., can solve the problems of difficult product morphology and size modulation, product morphology and adverse effects on properties, etc. The effect of avoiding adverse effects, easy industrial production, and easy process operation

Inactive Publication Date: 2011-10-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method has shortcomings. First, the obtained tungstic acid solution is alkaline, and it is difficult to modulate the shape and size of the product by changing its pH value; secondly, the ammonium in the tungstic acid sol Root ions will have certain adverse effects on the morphology and properties of the product; finally, the morphology of the obtained product is only spherical, and the particle size can only be adjusted between 20-60nm

Method used

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  • Method for preparing tungsten trioxide nano material
  • Method for preparing tungsten trioxide nano material
  • Method for preparing tungsten trioxide nano material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] The concrete steps of preparation are:

[0020] Step 1, first place the metal tungsten sheet in deionized water under stirring; wherein, the purity of the metal tungsten sheet is 99.9%. Then use a laser with a wavelength of 1064nm, a pulse width of 5ns, a repetition rate of 20Hz, and a single pulse energy of 50mJ to irradiate the metal tungsten sheet for 12min; wherein, the laser spot diameter is 1.5mm, and the laser is a Nd:YAG solid-state laser to obtain tungstic acid colloidal solution. Then, the tungstic acid colloidal solution is subjected to aging treatment for 24 hours; or acid is added to the tungstic acid colloidal solution to adjust its pH value to -0.6, wherein the acid is sulfuric acid; a yellow precipitate is obtained.

[0021] Alternatively, first place the metal tungsten sheet in an acid solution with a pH value of -0.6 under stirring; wherein, the purity of the metal tungsten sheet is 99.9%, and the acid is sulfuric acid. Then use a laser with a wavele...

Embodiment 2

[0024] The concrete steps of preparation are:

[0025] Step 1, first place the metal tungsten sheet in deionized water under stirring; wherein, the purity of the metal tungsten sheet is 99.99%. Then use a laser with a wavelength of 1064nm, a pulse width of 8ns, a repetition rate of 15Hz, and a single pulse energy of 65mJ to irradiate the metal tungsten sheet for 11.5min; wherein, the spot diameter of the laser is 1.8mm, and the laser is a Nd:YAG solid-state laser to obtain tungsten acid colloid solution. Next, aging treatment is performed on the tungstic acid colloidal solution for 25 hours; or adding acid to the tungstic acid colloidal solution to adjust its pH value to 0, wherein the acid is sulfuric acid; a yellow precipitate is obtained.

[0026] Alternatively, first place the metal tungsten sheet in an acid solution with a pH value of 0 under stirring; wherein, the purity of the metal tungsten sheet is 99.99%, and the acid is sulfuric acid. Then use a laser with a wavel...

Embodiment 3

[0029] The concrete steps of preparation are:

[0030] Step 1, first place the metal tungsten sheet in deionized water under stirring; wherein, the purity of the metal tungsten sheet is 99.9%. Then use a laser with a wavelength of 1064nm, a pulse width of 10ns, a repetition rate of 10Hz, and a single pulse energy of 80mJ to irradiate the metal tungsten sheet for 11min; wherein, the laser spot diameter is 2mm, and the laser is a Nd:YAG solid-state laser to obtain tungstic acid colloid solution. Then, the tungstic acid colloidal solution is subjected to aging treatment for 26 hours; or acid is added to the tungstic acid colloidal solution to adjust its pH value to 1, wherein the acid is sulfuric acid; a yellow precipitate is obtained.

[0031] Alternatively, first place the metal tungsten sheet in an acid solution with a pH value of 1 under stirring; wherein, the purity of the metal tungsten sheet is 99.9-99.99%, and the acid is sulfuric acid. Then use a laser with a wavelengt...

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Abstract

The invention discloses a method for preparing a tungsten trioxide nano material. The method comprises the following steps of: placing a metal tungsten plate in deionized water or distilled water with stirring, irradiating the metal tungsten plate by using laser with wavelength of 532nm or 1,064 nm, the pulse width of between 5 and 15ns, repetition frequency of 1 to 20Hz and single pulse energy of 50 to 120mJ for at least 10 minutes to obtain tungstic acid colloidal solution and then performing aging treatment on the tungstic acid colloidal solution for at least 24 hours or adding acid into the tungstic acid colloidal solution to adjust the pH value of the tungstic acid colloidal solution to be -0.6 to 3.0 to obtain yellow precipitates, or placing the metal tungsten plate in the acid solution with the pH value of -0.6 to 3.0 with stirring, and irradiating the metal tungsten plate by using the laser with the wavelength of 532nm or 1,064 nm, the pulse width of between 5 and 15ns, repetition frequency of 1 to 20Hz and single pulse energy of 50 to 120mJ to obtain the yellow precipitates, then centrifuging and washing the yellow precipitates to obtain the tungstic acid; and placing thetungstic acid at the temperature of 480 to 520 DEG C, and annealing for at least one hour to obtain the tungsten trioxide nano material. The appearance and the size of the product can be effectively adjusted and controlled in a large range.

Description

technical field [0001] The invention relates to a preparation method of a tungsten nano material, in particular to a preparation method of a tungsten trioxide nano material. Background technique [0002] Tungsten trioxide is an indirect bandgap n-type semiconductor metal oxide, which has broad application prospects in the fields of electrochromism, semiconductor gas sensing and photocatalysis. Nano-sized tungsten trioxide has unique excellent properties, it has a strong absorption capacity for electromagnetic waves, and can be actually used in solar energy absorbing materials and military hidden materials; the huge specific surface area and surface effect make it a Very good catalyst; as a transition metal compound, it also has semiconducting properties, and is a very potential sensitive material for H 2 S, NH 3 And many other gases are sensitive. Therefore, people have made unremitting efforts to obtain it, such as a "method for preparing nano-tungsten trioxide powder" d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82B3/00
Inventor 张洪文蔡伟平贾丽超
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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