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Nanometer gas-sensing material of ternary composite metal oxide and production thereof

A ternary composite, gas-sensing material technology, applied in the field of ternary composite metal oxide nano gas-sensing materials and their preparation, can solve the problems of complex operation steps, unsatisfactory sensitivity and selectivity, etc., and achieves controllable reaction conditions, The effect of mild experimental conditions and simple equipment

Inactive Publication Date: 2006-03-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are complex operation steps, unsatisfactory sensitivity and selectivity, and most of them focus on the detection of organic compound vapors and reducing gases such as alcohols, and the detection of NO x , CO, SO 2 The detection of environmental toxic gases such as seldom reported, especially in ZnO-SnO 2 The method of adding a third component compound on the basis of nanocomposites has not been reported so far

Method used

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  • Nanometer gas-sensing material of ternary composite metal oxide and production thereof
  • Nanometer gas-sensing material of ternary composite metal oxide and production thereof
  • Nanometer gas-sensing material of ternary composite metal oxide and production thereof

Examples

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Effect test

Embodiment 1

[0018] Al 2 o 3 -ZnO-SnO 2 preparation of

[0019] Accurately weigh 5.2602g Zn(NO 3 ) 2 ·6H 2 O and 2.9747g SnCl 4 ·5H 2 O was dissolved in 500mL deionized water to form a mixed salt solution, and under strong stirring at a speed of 400rpm, a dilute ammonia solution with a concentration of about 12% was slowly added dropwise to the above mixed solution until the pH value was 8.0 to form a precipitated precursor. Add 0.7658g AlCl immediately after the precipitation is complete 3 ·6H 2O, and under strong stirring at a speed of 400rpm, slowly drop a 12% dilute ammonia solution to adjust the pH value to 9.0, secondary precipitation, stand for aging for 24hrs, filter, and fully wash until there is almost no Cl in the filtrate - and NO 3 - , the obtained precipitate was dried at 100°C for 5hr, and then calcined in air atmosphere at 600°C for 6hr with a heating rate of 3°C / min to obtain Al 2 o 3 -ZnO-SnO 2 Composite metal oxide powder, where Zn 2+ / Sn 4+ The molar rat...

Embodiment 2

[0021] With embodiment 1, just AlCl 3 ·6H 2 The amount of O added was changed to 1.6165g, and Al 2 o 3 -ZnO-SnO 2 Composite metal oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 2:3, Al 2 o 3 The mass percent of composite oxide is 10%. The average particle size of the composite material is about 38nm, and the specific surface area is 100.5m 2 / g.

Embodiment 3

[0023] With embodiment 1, just AlCl 3 ·6H 2 The amount of O added was changed to 3.6374g, and Al 2 o 3 -ZnO-SnO 2 Composite metal oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 2:3, Al 2 o 3 The mass percent of composite oxide is 20%. The average particle size of the composite material is about 60nm, and the specific surface area is 56.7m 2 / g.

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Abstract

A nanometer gas-sensing material from ternary composite metal oxide and its production are disclosed. The procedure is carried out by preparing Zno-SnO2 presoma by co-precipitation, adding the third component metal oxide to obtain ternary metal composite oxide material with chemical formula MO-ZnO-SnO2 by secondary precipitation, and regulating compound composition, concentration of metal salt solution, Zn / Sn mol ratio, precipitation value and aging time. The ternary metal composite oxide consists of Mo 2-3mol% which is transient metal oxide and basic metal oxide, its grain size distribution is 30-90nm and specific surface is 20-100m2 / g. It has good sensitivity and selectivity.

Description

Technical field: [0001] The invention relates to a ternary composite metal oxide nano gas sensitive material and a preparation method thereof. Background technique: [0002] SnO 2 It is an N-type semiconductor metal oxide, which can be used as a gas-sensing material for detecting reducing and oxidizing gases. The currently available SnO 2 Based sensors generally have poor stability, sensitivity and selectivity are not ideal, especially in the sintering process of sensor production, the temperature is often ≥ 600 ° C, due to SnO 2 Particle growth or agglomeration greatly reduces sensitivity and selectivity. Researchers generally believe that the sensitive characteristics of gas-sensitive materials are closely related to their particle size and thermal stability. With the development of nanomaterials, sensors have entered a new stage. Due to their unique size effects and surface effects, nanostructured materials It is very sensitive to light, electricity, temperature and ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622G01N27/12
Inventor 白守礼黄晓东李殿卿李英霞陈霭璠罗瑞贤
Owner BEIJING UNIV OF CHEM TECH
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