Preparation method of chromium tungstate gas sensitive material for acetone gas sensor

An acetone gas-sensing and gas-sensing material technology, which is applied in the field of preparation of chromium tungstate gas-sensing materials, can solve the problems of being susceptible to external environment interference, poor stability consistency, and long preparation period, and achieves high sensitivity and good stability. , the effect of reducing the concentration

Active Publication Date: 2021-06-11
TIANJIN FIGARO ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide the preparation method of the chromium tungstate gas-sensing material used for the acetone gas sensor, adopt the hydrothermal method, react with dihydrate sodium tungstate and soluble chromium salt to obtain the chromium tungstate suspension , and then through hydrothermal treatment, the chromium tungstate gas sensing material used for acetone gas sensor with good dispersion is obtained, which not only overcomes the problems of low sensitivity, poor stability consistency and susceptibility to external environment interference in the existing acetone gas sensor defects, and overcome the defects of large energy consumption and long preparation period in the existing preparation method of tungstate materials

Method used

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  • Preparation method of chromium tungstate gas sensitive material for acetone gas sensor
  • Preparation method of chromium tungstate gas sensitive material for acetone gas sensor
  • Preparation method of chromium tungstate gas sensitive material for acetone gas sensor

Examples

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Effect test

Embodiment 1

[0050] The first step, the preparation of soluble chromium salt solution:

[0051] According to the mass ratio of the amount of soluble chromium salt and sodium tungstate dihydrate is 2:1, weigh 3.9218g of raw material solid Cr 2 (SO 4 ) 3 ·xH 2 O salt is placed in a container, and deionized water is added to form an aqueous solution of 33 mL of an aqueous solution with a chromium ion concentration of 0.6 mol / L, stirred at room temperature for 0.5 hours with a magnetic stirrer at a speed of 400 rpm, thus prepared Soluble chromium salt solution, ready for use;

[0052] The second step, the preparation of sodium tungstate solution:

[0053] According to the mass ratio of the amount of soluble chromium salt and sodium tungstate dihydrate is 2:1, weigh 3.2985g of raw material solid Na 2 WO 4 2H 2 O is placed in a container, and deionized water is added to prepare an aqueous solution of 25 mL of an aqueous solution with a concentration of tungstate ions of 0.4 mol / L, and sti...

Embodiment 2

[0061] The first step, the preparation of soluble chromium salt solution:

[0062] According to the mass ratio of the amount of soluble chromium salt and sodium tungstate dihydrate is 2:1, weigh 5.3288g of raw material solid CrCl 3 ·6H 2 O is placed in a container, and deionized water is added to form an aqueous solution with a chromium ion concentration of 0.7 mol / L. 29 mL of an aqueous solution is stirred at room temperature for 0.5 hours with a magnetic stirrer at a speed of 400 revolutions per minute, thereby preparing a soluble Chromium salt solution, ready for use;

[0063] The second step, the preparation of sodium tungstate solution:

[0064] According to the mass ratio of the amount of soluble chromium salt and sodium tungstate dihydrate is 2:1, weigh 3.2985g of raw material solid Na 2 WO 4 2H 2 O is placed in a container, and deionized water is added to prepare an aqueous solution of 17 mL of an aqueous solution with a concentration of tungstate ions of 0.6 mol / L,...

Embodiment 3

[0072] The first step, the preparation of soluble chromium salt solution:

[0073] The mass ratio of the amount of soluble chromium salt and sodium tungstate dihydrate is 2: 1, and 8.0030g of raw material solid Cr (NO 3 ) 3 9H 2 O is placed in a container, and deionized water is added to form a 30mL aqueous solution with a chromium ion concentration of 0.67 mol / L. Stir with a magnetic stirrer at room temperature for 0.5 hours at a speed of 400 rpm to obtain a soluble Chromium salt solution, ready for use;

[0074] The second step, the preparation of sodium tungstate solution:

[0075] According to the mass ratio of the amount of soluble chromium salt and sodium tungstate dihydrate is 2:1, weigh 3.2985g of raw material solid Na 2 WO 4 2H 2 O is placed in a container, and deionized water is added to prepare an aqueous solution of 20 mL of an aqueous solution with a concentration of tungstate ions of 0.5 mol / L, and stirred at room temperature for 0.5 hours with a magnetic s...

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Abstract

The preparation method of the chromium tungstate gas-sensing material used for the acetone gas sensor of the present invention involves a tungsten compound, adopts a hydrothermal method, and the steps are: drop sodium tungstate solution into a soluble chromium salt solution to generate chromium tungstate suspension Liquid, hydrothermal treatment, high-speed centrifugation, drying to produce dry chromium tungstate powder containing crystal water, which is sintered in a muffle furnace at high temperature to obtain a chromium tungstate gas-sensing material for acetone gas sensor with good dispersion. The method of the invention not only overcomes the defects of the existing acetone gas sensor, such as low sensitivity, poor stability consistency and being easily disturbed by the external environment, but also overcomes the large energy consumption and the preparation method of the existing tungstate material. The defect of long period.

Description

technical field [0001] The technical solution of the present invention relates to a tungsten compound, specifically a method for preparing a chromium tungstate gas-sensing material used for an acetone gas-sensing sensor. Background technique [0002] Acetone is a colorless and transparent liquid at room temperature, has a special pungent smell, is flammable and volatile, and has relatively active chemical properties. With the continuous development of medical treatment, there is an increasing demand for a non-invasive method to detect diabetes by detecting exhaled breath. In the diagnosis of diabetes, breath analysis is required to detect the content of acetone gas. Among them, gas chromatography, density bottle method, Mohr's salt method and gas sensor detection method are commonly used. Among them, the detection method based on the semiconductor metal oxide gas sensor has been continuously researched and developed due to its flexible and simple operation, high sensitivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12G01N27/26C01G41/00
CPCC01G41/00C01P2002/72C01P2004/03C01P2004/61C01P2006/80G01N27/26
Inventor 李琦徐洁
Owner TIANJIN FIGARO ELECTRONICS
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