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Rare earth modified zinc oxide gas sensor and preparation method thereof

A gas sensor and rare earth modification technology, which is applied in the field of rare earth modified zinc oxide gas sensor and its preparation, can solve the problems of poor selectivity, long response recovery time, low sensitivity and the like, and achieves low production cost and high sensitivity , the effect of simple production process

Inactive Publication Date: 2014-01-01
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the gas sensors coated with zinc oxide still have shortcomings such as low sensitivity, poor selectivity, and long response recovery time, which limit their further wide application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 0.25mol / L Zn(NO 3 ) 2 ·6H 2 O was dissolved in 40 mL of deionized water to make zinc solution, stirred for 10 min, 40 mL of 2mol / L NaOH solution was added dropwise to the above solution, stirred for 30 min, transferred to a 100 mL autoclave, and reacted at 180 °C for 10 h. The obtained precipitate was washed with distilled water and absolute ethanol several times in sequence, and then dried at 80° C. to form zinc oxide powder for later use.

[0020] Under the above experimental conditions, in-situ doping of 7at% Sm(NO 3 ) 3 ·6H 2 O, stirred for 10 min, added dropwise 40 ml of NaOH solution with a molar concentration of 2 mol / L to the above solution, stirred for 30 min, transferred to a 100 mL autoclave, and reacted at 180 ° C for 10 h. The obtained precipitate is washed with distilled water and absolute ethanol several times in sequence, and then dried at 80° C. to obtain zinc oxide compounded with samarium.

[0021] Take 10mg of zinc oxide or zinc oxide powder of...

Embodiment 2

[0024] 0.17mol / L Zn(NO 3 ) 2 ·6H 2 O was dissolved in 40mL of deionized water to make a zinc solution, stirred for 10min, added dropwise to 30mL of NaOH solution with a molar concentration of 1.2mol / L, and 0.0019mol / L of ethylenediamine was added, ultrasonicated for 30min, and transferred to a 100mL high-pressure In the reaction kettle, react at 180°C for 20h. The obtained precipitate was washed several times with distilled water and absolute ethanol successively, and then dried at 80° C. into white zinc oxide powder for future use.

[0025] Under the above experimental conditions, in-situ doping of 5at% Er(NO 3 ) 3 ·6H 2 O, stirred for 10 min, added dropwise to 30 mL of NaOH solution with a molar concentration of 1.2 mol / L, and added 0.0019 mol / L ethylenediamine, ultrasonicated for 30 min, transferred to a 100 mL autoclave, and reacted at 180 °C for 20 h. The obtained precipitate was washed several times with distilled water and absolute ethanol successively, and then d...

Embodiment 3

[0029] 0.15mol / L Zn(CH 3 COO) 2 ·6H 2O was dissolved in 40 mL of deionized water to make a zinc solution, stirred for 10 min, added dropwise to 40 mL of NaOH solution with a molar concentration of 3 mol / L, ultrasonicated for 30 min, transferred to a 100 mL autoclave, and reacted at 100 °C for 15 h. The obtained precipitate was washed with distilled water and absolute ethanol several times in sequence, and then dried at 80° C. to make zinc oxide powder for later use.

[0030] Under the above experimental conditions, 4at% Y(NO 3 ) 3 ·6H 2 O, stirred for 10 min, added dropwise to 40 mL of NaOH solution with a molar concentration of 3 mol / L, ultrasonicated for 30 min, transferred to a 100 mL autoclave, and reacted at 100 °C for 15 h. The obtained precipitate was washed several times with distilled water and absolute ethanol successively, and then dried at 80°C to prepare yttrium-doped zinc oxide powder for future use. .

[0031] Take 8 mg of yttrium-doped zinc oxide or zinc...

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Abstract

The invention relates to a rare earth modified zinc oxide gas sensor and a preparation method thereof and belongs to the technical field of trace gas detection. The invention provides the gas sensor which has high sensitivity, selectivity and stability to volatile organic materials and has short response recovery time and further provides the preparation method of the gas sensor. According to the invention, a rare earth modified zinc oxide material is applied on the outer surface of an aluminium oxide ceramic pipe; a rare earth modified zinc oxide gas-sensing material uses different zinc sources as raw materials, a hydrothermal method is adopted, and one or multiple rare earth elements are doped in situ to improve the sensitivity of the material to different volatile organic materials. The invention has the advantages that the production technology is simple, the operation is simple and convenient, the manufacturing cost is low, the pollution is low, the doping or compounding process is accomplished at one step, and a prepared sensor has high sensitivity, strong selectivity and long-term stability to organic volatile gas and short response recovery time.

Description

technical field [0001] The invention relates to a rare earth modified zinc oxide gas sensor and a preparation method thereof, belonging to the technical field of trace gas detection. technical background [0002] With the rapid development of modern science and technology, the scale of industrial production has expanded rapidly, and the types and quantities of flammable, explosive, toxic and harmful gases used and produced in the production process have also continued to increase. Once they leak, they will seriously pollute the environment, and there is a risk of explosion, fire and poisoning. With the wide application of organic decorative materials and the improvement of the airtightness of residential structures, the health problems caused by indoor pollutant gases released in the home and work environment have also been paid more and more attention. In addition, the grade assessment and safe storage of agricultural products such as grain, vegetables and fruits, the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 宋金玲任文强蔡颖张胤
Owner INNER MONGOLIA UNIV OF SCI & TECH
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