Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of n-p heterogeneous core-shell structure gas sensitive material and preparation method thereof

A technology of gas-sensing materials and core-shell structure, which is applied in the fields of material resistance, material analysis, and material analysis through electromagnetic means, and can solve problems such as shortening the service life of gas-sensing materials, depletion of interface electrons, and reducing the gas-sensitivity of materials , to achieve the effect of low price, strong selectivity and high sensitivity

Active Publication Date: 2020-12-08
CHINA JILIANG UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the exposure of p-type materials to the air will lead to the depletion of interface electrons, which will reduce the gas sensitivity of the material and shorten the service life of the gas sensitive material.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: a kind of preparation method of n-p heterogeneous core-shell structure gas-sensing material, specifically finish according to the following steps: 2.92g Co(NO 3 ) 2 ·6H 2 O and 2g F127 were dissolved in a mixture of 100 ml deionized water and 50 ml 2 mol / L hydrochloric acid, and stirred in a water bath at 40°C for 2 h; 2. Add 4.5 ml ethyl orthosilicate dropwise, and stir for 2 h Finally, stop stirring, and age at a constant temperature for 24 h to obtain a spherical latex-like nano-precursor; three, get 5g precursor, 1.8g urea and 0.532g Na 2 SnO 3 ·3H 2 O put into a polytetrafluoroethylene cup, add a mixture of 50ml deionized water and 50ml absolute ethanol and stir evenly, then put the mixture in an autoclave, heat it in water at 150°C for 20h, and wash it centrifugally with distilled water and ethanol after cooling To neutrality, the obtained powder was calcined at 600°C for 6 h; 4. Put the sample obtained above in 2 mol / L NaOH solution to remove in...

Embodiment 2

[0010] Embodiment 2: a kind of preparation method of n-p heterogeneous core-shell structure gas-sensing material, specifically finish according to the following steps: 2.92g Co(NO 3 ) 2 ·6H 2 O and 2g F127 were dissolved in a mixture of 100ml deionized water and 100ml 2 mol / L hydrochloric acid, and stirred in a water bath at 35°C for 2 hours; 2. Add 4.5ml ethyl orthosilicate dropwise, and stir for 2 hours Finally, stop stirring, and age at a constant temperature for 24 h to obtain a spherical latex-like nano-precursor; three, get 5g precursor, 1.8g urea and 0.532g Na 2 SnO 3 ·3H 2 O put into a polytetrafluoroethylene cup, add a mixture of 75ml deionized water and 25ml absolute ethanol and stir evenly, then put the mixture into an autoclave, heat it in water at 180°C for 10h, and wash it centrifugally with distilled water and ethanol after cooling To neutrality, the obtained powder was calcined at 500°C for 8 h; 4. Put the sample obtained above in 2 mol / L NaOH solution to r...

Embodiment 3

[0012] Embodiment 3: a kind of preparation method of n-p heterogeneous core-shell structure gas-sensing material, specifically finish according to the following steps: 2.92g Co(NO 3 ) 2 ·6H 2 O and 2g F127 were dissolved in a mixture of 50ml deionized water and 100ml 2 mol / L hydrochloric acid, and stirred in a water bath at 45°C for 2 hours; 2. Add 4.5ml ethyl orthosilicate dropwise, and stir for 2 hours Finally, stop stirring, and age at a constant temperature for 24 h to obtain a spherical latex-like nano-precursor; three, get 5g precursor, 1.8g urea and 0.532g Na 2 SnO 3 ·3H 2 Put O into a polytetrafluoroethylene cup, add a mixture of 25ml deionized water and 75ml absolute ethanol and stir evenly, then put the mixture in an autoclave, heat it in water at 100°C for 24 hours, and wash it centrifugally with distilled water and ethanol after cooling To neutrality, the obtained powder was calcined at 700°C for 4 h; 4. Put the sample obtained above in 2 mol / L NaOH solution to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an n-p heterogeneous core-shell structure gas sensitive material and a preparation method thereof, and in particular relates to a Co3O4@SnO2 core-shell structure gas sensitivematerial that adopts p-type nanometer Co3O4 as a core and n-type nanometer SnO2 as a shell, and a preparation method thereof. On the one hand, the gas sensitive material provided by the invention prevents exhausting of interface electrons due to the fact that the p-type Co3O4 in the core layer is exposed to the air, and on the other hand, the energy band structure of the gas sensitive material isimproved by using the n-type SnO2 in the shell layer, so as to improve sensitivity and selectivity of the gas sensitive material aiming at a specific gas. The method provided by the invention is widein source, low in cost, and simple in chemical preparation method; the acquired n-p heterogeneous Co3O4@SnO2 core-shell structure gas sensitive material is high in sensitivity and strong in selectivity.

Description

technical field [0001] The invention relates to the field of gas-sensing materials, in particular to a preparation method of an n-p heterogeneous core-shell structure gas-sensing material. 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 price is expensive, and the response speed is slow. Therefore, the development of NO 2 The rapid, high-sensitivity,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 徐靖才洪波王新庆金红晓彭晓领金顶峰葛洪良
Owner CHINA JILIANG UNIV