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A kind of n-p heterogeneous porous spherical gas sensitive material and its preparation method

A gas-sensitive material, n-p technology, which is applied in material resistance, material analysis, material analysis by electromagnetic means, etc., can solve the problems of complex structure, slow response speed and high price, and achieve high sensitivity, low price and selectivity. strong effect

Active Publication Date: 2021-01-29
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial NO 2 The sensor is mainly based on the electrochemical principle, its structure is complex, expensive, and the response speed is slow

Method used

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  • A kind of n-p heterogeneous porous spherical gas sensitive material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The steps are:

[0011] 1. Add 4.85 g Ni(NO 3 ) 2 • 6 H 2 O was placed in a bubbling stirred tank, and cyclohexane, water, n-hexanol and sodium lauryl sulfate were added, stirred and fully dissolved in a water bath at 10°C; 2. From the bottom of the bubbling stirred tank, the rate into CO 2 Bubble for 30 min, then increase the pressure in the bubbling stirred tank to 0.05 MPa, stop feeding CO 2 ; 3. Add 2mol / L NaOH solution dropwise to pH = 11, and let it stand for 2 h; 4. Add 1.46g SnCl 4 ·5H 2 O and stirred at 60 °C to powder, and then put into a muffle furnace for calcination at 600 °C for 6 h to obtain n-p heterogeneous porous spherical gas-sensing materials.

[0012] Carry out XRD and TEM characterization to the sample prepared in embodiment 1, detect SnO 2 phase and NiO phase, and found nano-SnO 2 Loaded on the structure of porous spherical NiO; the sensitivity of the sample prepared in Example 1 to 5 ppm NO at 300 °C is 13.4, and the recovery time is 13s;...

Embodiment 2

[0014] The steps are:

[0015] 1. Add 4.85 g Ni(NO 3 ) 2 • 6 H 2 O was placed in a bubbling stirred tank, and cyclohexane, water, n-hexanol and sodium lauryl sulfate were added, stirred and fully dissolved in a water bath at 5°C; 2. From the bottom of the bubbling stirred tank, the rate into CO 2 Bubble for 30 min, then increase the pressure in the bubbling stirred tank to 0.1 MPa, stop feeding CO 2 ; 3. Add 2mol / L NaOH solution dropwise to pH = 8, and let stand for 1 h; 4. Add 1.46 g SnCl 4 ·5H 2 O and stirred at 80 °C to powder, and then placed in a muffle furnace for calcination at 700 °C for 4 h to obtain n-p heterogeneous porous spherical gas-sensing materials.

[0016] Carry out XRD and TEM characterization to the sample prepared in embodiment 2, detect SnO 2 phase and NiO phase, and found nano-SnO 2 The structure supported on porous spherical NiO; the sensitivity of the sample prepared in Example 2 to 5 ppm NO at 300 °C is 11.8, and the recovery time is 12s; the...

Embodiment 3

[0018] The steps are:

[0019] 1. Add 4.85 g Ni(NO 3 ) 2 • 6 H 2 O was placed in a bubbling stirred tank, and cyclohexane, water, n-hexanol and sodium lauryl sulfate were added, stirred and fully dissolved in a water bath at 20°C; rate into CO 2 Bubble for 30min, then increase the pressure in the bubbling stirred tank to 0.08 MPa, stop feeding CO 2 ; 3. Add 2mol / L NaOH solution dropwise to pH = 10, and let stand for 1.5 h; 4. Add 0.73g SnCl 4 ·5H 2 O and stirred at 70 °C to powder, and then placed in a muffle furnace for calcination at 400 °C for 8 h to obtain n-p heterogeneous porous spherical gas-sensing materials.

[0020] Carry out XRD and TEM characterization to the sample prepared in embodiment 3, detect SnO 2 phase and NiO phase, and found nano-SnO 2 The structure supported on porous spherical NiO; the sensitivity of the sample prepared in Example 3 to 5 ppm NO at 300 °C is 12.8, and the recovery time is 12s; for 5 ppm NO 2 The sensitivity is 16.1 and the recov...

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Abstract

The invention relates to an n-p heterogeneous spherical gas-sensitive material and a preparation method thereof, in particular to a p-type porous spherical NiO loaded n-type nano-SnO 2 Gas sensitive material and preparation method. The preparation steps are: 1. A certain amount of Ni(NO 3 ) 2 • 6 H 2 O is put into a bubbling stirred tank, add cyclohexane, water, n-hexanol and sodium lauryl sulfate, stir and fully dissolve in a water bath at 5~20°C; Inject CO at a rate of ml / min 2 Bubble for 30min, then increase the pressure in the bubbling stirred tank to 0.05~0.1 MPa, stop feeding CO 2 ; 3. Add 2mol / L NaOH solution drop by drop to pH=8~11, let stand for 1~2 h; 4. Add a certain amount of SnCl 4 ·5H 2 O and stirred at 50-80°C to powder, and then put into a muffle furnace for calcination at 500-700°C for 4-8h to obtain n-p heterogeneous porous spherical gas-sensing materials.

Description

technical field [0001] The invention relates to an n-p heterogeneous porous spherical gas-sensing material and its preparation method, in particular to a p-type porous spherical NiO loaded n-type nano-SnO 2 The gas sensitive material and its preparation method belong to the field of material preparation. Background technique [0002] In recent years, with the rapid growth of automobile ownership in my country, a large amount of NOx (mainly NOx 2 and NO), will seriously affect the air quality, causing PM2.5 to soar. In response to the increasingly prominent problem of air pollution, the country officially implemented the "Law of the People's Republic of China on the Prevention and Control of Air Pollution" on January 1, 2016. Therefore, the prevention and control of air pollution and the monitoring of gas pollution sources are of high urgency. At present, the commercial NO 2 The sensor is mainly based on the principle of electrochemistry, its structure is complicated, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 金恺乐徐靖才王新庆洪波彭晓领王攀峰金红晓金顶峰葛洪良
Owner CHINA JILIANG UNIV
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