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Gas-sensing material with noble metal doped composite metal oxide and its production

A technology of noble metal oxides and composite metals, applied in the direction of material resistance, etc., can solve the problems of complicated operation steps, unsatisfactory sensitivity and selectivity, etc., and achieve the effects of controllable reaction conditions, improved sensitivity and selectivity, and good dispersion performance

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 and other environmental toxic gases are rarely reported

Method used

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  • Gas-sensing material with noble metal doped composite metal oxide and its production
  • Gas-sensing material with noble metal doped composite metal oxide and its production
  • Gas-sensing material with noble metal doped composite metal oxide and its production

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Preparation of Composite Metal Oxide Gas Sensitive Materials Added Noble Metals

[0022] Accurately weigh 1.488g Zn(NO 3 ) 2 ·6H 2 O, 7.014g SnCl 4 ·5H 2 O and 0.0577g PdCl 2 Dissolve in 500mL deionized water to form a mixed salt solution, and slowly add dilute ammonia solution with a concentration of about 12% into the above mixed solution until the pH value is 8.0 under vigorous stirring at a speed of 400rpm to form a precipitation precursor. Set aging for 24hr, 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 at 600°C for 6hr in an air atmosphere with a heating rate of 3°C / min to obtain PdO x -ZnO-SnO 2 Composite metal oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 1:4, and the mass percentage of Pd in ​​the composite oxide is 1%. From the TEM of the composite ( figure 1 ) to see that the average particle size is about 35nm, and the specific surfac...

Embodiment 2

[0024] PdCl 2 The add-on amount is changed into 0.1163g, other is the same as embodiment 1, prepares PdO x -ZnO-SnO 2 Composite oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 1:4, and the mass percentage of Pd in ​​the composite oxide is 2%. The composite material has an average particle size of about 25nm and a specific surface area of ​​110.0m 2 / g.

Embodiment 3

[0026] Change the amount of ZnO added to 2.976g, PdCl 2 The addition of PdO is changed into 0.1595g, and other is the same as embodiment 1, and the preparation obtains PdO x -ZnO-SnO 2 Composite oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 1:2, and the mass percentage of Pd in ​​the composite oxide is 4%. The composite material has an average particle size of about 50nm and a specific surface area of ​​45.6m 2 / g.

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Abstract

A composite metal oxide gas-sensing material with noble metal doped and its production are disclosed. The procedure is carried out by doping noble metal into ZnO-SnO2 to obtain metal composite oxide material Mo-ZnO-SnO2, and regulating compound composition, concentration of metal salt solution, Zn / Sn mol ratio, precipitation value and aging time. The metal composite oxide consists of noble metal 0.5-6mol%, its grain size distribution is 20-80nm and specific surface is 30-120m2 / g.

Description

Technical field: [0001] The invention relates to a semiconductor composite metal oxide 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 sensor for detecting reducing and oxidizing gases. Currently, there are many types of metal oxide semiconductor gas sensors used in gas alarm and monitoring systems, and SnO is commonly used. 2 , Fe 2 o 3 , SrTiO 3 、WO 3 Various gas sensors after modification such as doping and the like. Among all kinds of gas sensors, semiconductor gas sensors occupy a large market share due to their advantages of low price, small size, simple structure, and fast response, while SnO 2 Gas-based sensors still play a dominant role in gas detection. However, the problems in sensitivity, selectivity and stability of this type of sensor seriously restrict its development, and even cause major accidents and losses due to failure. The existenc...

Claims

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Application Information

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IPC IPC(8): C04B35/453G01N27/12
Inventor 马丽景黄晓东白守礼李殿卿杜俊岐陈霭璠
Owner BEIJING UNIV OF CHEM TECH
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