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Hydrogen sulfide gas sensitive material and its preparation and preparation method of hydrogen sulfide gas sensitive device

A hydrogen sulfide gas and gas-sensing material technology, applied in the field of hydrogen sulfide gas sensing, can solve the problems of short recovery time, easy poisoning performance, degradation, etc., and achieve the effect of low working temperature, high sensitivity and short recovery time

Inactive Publication Date: 2018-11-06
佛山市顺德区众美照明电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

for H 2 For S gas, conventional SnO 2 etc. and its doped gas-sensing materials have defects such as long response-recovery time and degradation of poisoning performance, so a gas-sensing response-recovery time is short and stable H 2 S gas-sensitive materials are of great significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare hydrogen sulfide gas sensor, the steps are as follows:

[0029] 1) Weigh 1.9393g of bismuth nitrate and add it to a mixed solution of 60mL of isopropanol and 10mL of glycerin (the mass percent concentration of bismuth nitrate is 3.25%), stir to obtain a clear solution, and then transfer the clear solution to polytetrafluoroethylene hydrothermal In the reaction kettle, the temperature was raised to 180°C for 6 hours of heat preservation and reaction. After the reaction was completed, it was naturally cooled to room temperature. After the obtained precipitate was suction-filtered and washed, it was dried at 80°C to obtain light yellow bismuth glycerol compound powder (molecular formula Bi 2 (OCH 2 CHOHCH 2 O) 3 , molecular weight 689);

[0030] 2) Weigh 0.4568g of the bismuth glycerol compound powder obtained above, and disperse it in 30mL of deionized water by ultrasonic dispersion method to obtain a dispersion liquid, and add 0.6424g of Na 2 MoO 4 2H 2 O ...

Embodiment 2

[0034] Prepare hydrogen sulfide gas sensor, the steps are as follows:

[0035] 1) Weigh 298.6g of bismuth nitrate and add it to the mixed solution of 50L isopropanol and 50L glycerin (the mass percent concentration of bismuth nitrate is 0.3%), stir to obtain a clear solution, then transfer the clear solution to polytetrafluoroethylene hydrothermal In the reaction kettle, heat up to 160°C and keep it warm for 24 hours. After the reaction, it is naturally cooled to room temperature. After the obtained precipitate is suction-filtered, washed, and dried at 80°C, a light yellow bismuth glycerol compound powder is obtained;

[0036] 2) Weigh 100 g of the bismuth glycerol compound powder obtained above, and disperse it in 1 L of deionized water by ultrasonic dispersion method to obtain a dispersion liquid, and add 210 g of Na 2 MoO 4 2H 2 O and 0.4236g of Fe(NO 3 ) 3 9H 2 O, then use dilute nitric acid to adjust the pH value of the dispersion to 1, stir to make it evenly mixed t...

Embodiment 3

[0040] Prepare hydrogen sulfide gas sensor, the steps are as follows:

[0041] 1) Weigh 587.3g of bismuth nitrate and add it to the mixed solution of 3L isopropanol and 0.5L glycerin (the mass percent concentration of bismuth nitrate is 20%), stir to obtain a clear solution, then transfer the clear solution to polytetrafluoroethylene water In a thermal reaction kettle, raise the temperature to 200°C and keep it warm for 2 hours. After the reaction, naturally cool to room temperature. After the obtained precipitate is suction filtered, washed, and dried at 80°C, a light yellow bismuth glycerol compound powder is obtained;

[0042] 2) Weigh 200 g of the bismuth glycerol compound powder obtained above, and disperse it in 10 L of deionized water by ultrasonic dispersion method to obtain a dispersion liquid, and add 46.9 g of Na 2 MoO 4 2H 2 O and 9.5g of Fe(NO 3 ) 3 9H 2 O, then use dilute nitric acid to adjust the pH value of the dispersion to 1, stir to make it evenly mixed...

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Abstract

The invention relates to a hydrogen-sulfide gas-sensitive material, a preparation method thereof and a preparation method for a hydrogen-sulfide gas-sensitive device. The hydrogen-sulfide gas-sensitive material comprises iron-doped Bi2MoO6 nano powder, wherein the molar ratio of Fe to Mo is 0.1-50:100. The preparation method comprises the following steps of: (1) adding bismuth nitrate into mixed liquid of isopropyl alcohol and glycerin, stirring, then transferring into a hydrothermal reaction kettle, and reacting to obtain bismuth-glycerin compound powder; (2) dispersing the bismuth-glycerin compound powder into deionized water, adding Na2MoO4 2H2O and soluble iron salt, adjusting the pH value of dispersed liquid to 1-7, stirring, then transferring into the hydrothermal reaction kettle, and reacting to obtain the H2S gas-sensitive material. The H2S gas-sensitive material provided by the invention has the characteristics of small-size effect, surface effect and the like, the H2S gas-sensitive device prepared by utilizing the material is short in response-restoration time, high in sensitivity and low in optimal working temperature and can be used for detecting H2S with the concentration being lower than 10ppm.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor gas sensor devices, and relates to a hydrogen sulfide gas sensor [0002] The material and its preparation and the preparation method of the hydrogen sulfide gas sensor. Background technique [0003] h 2 S is a colorless, flammable, toxic gas with the smell of rotten eggs. It mainly comes from industrial manufacturing plants such as pickle ponds, soy sauce fermentation ponds, biogas digesters, cellars or dredging sewers, mines, cooking furnaces, steelworks, tanneries, craft paper mills and oil refineries. When inhaling a small amount of low concentration of H 2 When S is high, it will affect the human eyes, respiratory system and central nervous system, and long-term exposure can cause neurasthenia syndrome and autonomic dysfunction; when inhaling high concentrations of H 2 When S, there will be eye pain, burning sensation in the throat, confusion, etc.; when inhaling a very ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 林志东许梦莹高淳付萍王学华
Owner 佛山市顺德区众美照明电器有限公司
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