Tungsten oxide nanoflake self-assembly nanosphere and application method and application of tungsten oxide nanoflake self-assembly nanosphere

A self-assembly, tungsten oxide technology, applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology, material resistance, etc., can solve the problems such as the application of nano-tungsten oxide self-assembly structure, which is easy to popularize, easy to operate, high Effects of sensitivity and selectivity

Inactive Publication Date: 2012-10-31
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no technology to prepare nano-tungsten oxide self-assembled structure by ultrasonic method and its application in semiconductor gas sensors

Method used

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  • Tungsten oxide nanoflake self-assembly nanosphere and application method and application of tungsten oxide nanoflake self-assembly nanosphere
  • Tungsten oxide nanoflake self-assembly nanosphere and application method and application of tungsten oxide nanoflake self-assembly nanosphere
  • Tungsten oxide nanoflake self-assembly nanosphere and application method and application of tungsten oxide nanoflake self-assembly nanosphere

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Accurately weigh 2.6080g of sodium tungstate dihydrate and dissolve it in 30mL of deionized water, place it in a KQ-250B ultrasonic generator for ultrasonic dissolution, then add 1.000g of oxalic acid, and after it is completely dissolved, use a hydrochloric acid solution with a concentration of 3.00mol / L Slowly add it dropwise to the above solution until the pH value is 1.30, continue ultrasonication for 60 minutes, centrifuge and wash the obtained yellow precipitate, and dry it at 60°C for 12 hours to obtain tungsten oxide powder.

[0024] The scanning electron microscopy results of the figure 1 and figure 2 , the diameter of tungsten oxide microspheres is 1-3 μm, and they are self-assembled from lamellar structural units with a thickness of 10-20 nm; the XRD analysis results of the prepared tungsten oxide powder are shown in image 3 , the obtained product is monoclinic tungsten oxide with high crystallinity.

Embodiment 2

[0026] Accurately weigh 1.3040g of ammonium paratungstate and dissolve it in 20mL of deionized water, place it in a probe ultrasonic generator for ultrasonic dissolution, add 0.7000g of oxalic acid, and after it is completely dissolved, slowly add a hydrochloric acid solution with a concentration of 3.00mol / L to the above solution until The pH value was 1.30. After continuing to sonicate for 120 minutes, the obtained pale yellow precipitate was centrifuged and washed, and dried at 60° C. for 12 hours to obtain tungsten oxide powder.

Embodiment 3

[0028] Accurately weigh 1.3040g of sodium tungstate dihydrate and dissolve it in 20mL of deionized water, place it in a KQ-250B ultrasonic generator for ultrasonic dissolution, add 0.5000g of oxalic acid, and slowly dissolve it with a nitric acid solution with a concentration of 3.00mol / L after it is completely dissolved. Add it dropwise to the above solution until the pH value is 1.52, continue ultrasonication for 30 minutes, centrifuge and wash the obtained pale yellow precipitate, and dry it at 60°C for 12 hours to obtain tungsten oxide powder.

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Abstract

The invention provides a tungsten oxide nanoflake self-assembly nanosphere gas-sensitive material, a preparation method and application of the gas-sensitive material. Tungsten oxide nanoflake self-assembly nanosphere is successfully prepared by an ultrasonic method under the mild condition, the diameter of the tungsten oxide nanosphere ranges from 1 micrometer to 3 micrometers, and the tungsten oxide nanosphere consists of lamella structure units in a self-assembly manner. Compared with an existing method for preparing a tungsten oxide nanometer material, the method has the advantages of simple equipment, convenience in operation, mild experimental condition, low cost and the like. The prepared tungsten oxide nanoflake self-assembly nanosphere has high sensitivity and selectivity to low-concentration NO2 at low operation temperature, and is applicable to detecting trace nitrogen dioxide in environments.

Description

technical field [0001] The invention relates to the fields of nano-oxide preparation technology and sensing technology, in particular to a tungsten oxide nanosheet self-assembled microsphere and a preparation method thereof, and using it as a sensitive material for a semiconductor gas sensor. Background technique [0002] Tungsten trioxide is an n-type wide bandgap semiconductor oxide (bandgap width about 2.8eV). Due to the presence of atomic or electronic defects in the crystal, the stoichiometric deviation of the compound occurs, and its charge carrier concentration is mainly determined by The concentration of stoichiometric defects, such as oxygen vacancies, endows them with excellent catalytic and gas-sensing properties. Tungsten oxide based gas sensor for NO 2 、H 2 S, O 3 and NH 3 Many environmental harmful gases have sensitive responses, especially for low concentrations of nitrogen oxides, showing ultra-high sensitivity. In addition, tungsten oxide also has photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y40/00G01N27/04
Inventor 白守礼张克伟罗瑞贤李殿卿陈霭璠
Owner BEIJING UNIV OF CHEM TECH
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