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Loose thin-walled gas sensor and its preparation method

A gas sensor and loose technology, which is applied in the field of metal oxide gas sensor with loose and thin-walled structure and its preparation, can solve the problems of uneven nano-particles, achieve the effects of simplifying the synthesis process, improving performance and improving sensitivity

Inactive Publication Date: 2015-08-12
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanoparticles produced by many preparation methods are not uniform, which limits the improvement of the gas sensitivity of the material.

Method used

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  • Loose thin-walled gas sensor and its preparation method
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  • Loose thin-walled gas sensor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Choose Rapeseed Pollen as the template. Take the pretreated rapeseed pollen and disperse it in 50mL of 0.0006mol / L SnCl 4In the precursor solution, after stirring for 14 hours, centrifuge and wash with ethanol three times to obtain an impregnated product, completing the first step impregnated process. Disperse the impregnation again in 0.0006mol / L PdCl 2 In the precursor solution, after stirring for 4 hours, centrifuge and wash with ethanol three times to obtain the secondary impregnation. In order to increase the adsorption / deposition of Sn in pollen, the third impregnation treatment was carried out, and the second impregnation was added to 50mL distilled water for surface hydration treatment, and then recovered by centrifugation, redispersed in 50mL ethanol, and after 10min, Dry at 60°C for 3h, then disperse in 50mL of 0.0006mol / L SnCl 4 In the precursor solution, after stirring for 4 hours, it was centrifuged and washed three times with ethanol to obtain three imp...

Embodiment 2

[0048] Choose Rapeseed Pollen as the template. Take the pretreated rapeseed pollen and disperse it in 50mL of 0.0006mol / L SnCl 4 In the precursor solution, stirred for 14 hours, centrifuged and washed three times with ethanol, an impregnated product was obtained, and the first step of impregnated process was completed. Disperse the impregnation again in 0.006mol / L PdCl 2 In the precursor solution, stir for 4 hours, centrifuge, and wash with ethanol three times to obtain the secondary impregnation. In order to increase the adsorption / deposition of Sn in rapeseed pollen, a third impregnation treatment was carried out, and the secondary impregnation was added to 50mL distilled water for surface hydration treatment, and then recovered by centrifugation and redispersed in 50mL ethanol After 10min, dry at 60°C for 3h, then disperse in 50mL of 0.0006mol / L SnCl 4 In the precursor solution, stirred for 4 hours, centrifuged, and washed with ethanol three times, three impregnations we...

Embodiment 3

[0051] Choose Rapeseed Pollen as the template. Take the pretreated rapeseed pollen and disperse it in 50mL of 0.0006mol / L SnCl 4 In the precursor solution, stirred for 14 hours, centrifuged and washed three times with ethanol, an impregnated product was obtained, and the first step of impregnated process was completed. Disperse the impregnation again in 0.004mol / L PdCl 2 In the precursor solution, stir for 4 hours, centrifuge, and wash with ethanol three times to obtain the secondary impregnation. In order to increase the adsorption / deposition of Sn in rapeseed pollen, the third impregnation treatment was performed, and the second impregnation was added to 50mL distilled water for surface hydration treatment, and then recovered by centrifugation, and redispersed in 50mL ethanol for 10min Afterwards, dry at 60°C for 3h, then disperse in 50mL of 0.0006mol / L SnCl 4 In the precursor solution, stirred for 4 hours, centrifuged, and washed with ethanol three times, three impregnat...

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Abstract

The invention discloses a loose thin-wall gas sensitive element and a manufacturing method thereof. The gas sensitive element comprises a metal oxide gas sensitive composite material and a substrate, wherein the metal oxide gas sensitive composite material has a loose thin-wall structure; the gas sensitive composite material is uniformly distributed nanometer particles doped with noble metal. The method for manufacturing the gas sensitive element comprises the following steps of: firstly, pre-processing a template and putting the pre-processed template to a precursor solution and soaking by three steps; then, carrying out cleaning, drying and sintering in sequence to prepare the metal oxide gas sensitive composite material with the loose thin-wall structure; and finally, coating the metal oxide gas sensitive composite material to the surface of the substrate and carrying out ageing treatment to obtain the metal oxide gas sensitive element with the loose thin-wall structure. The invention further discloses a method for manufacturing the gas sensitive element with the loose thin wall. The method is simple in process; and the gas sensitive element with excellent performances is obtained by changing the type of the composite, adjusting the dimension of nanometer particles and selecting different templates, so that the manufactured loose thin-wall gas sensitive element has high flexibility to the to-be-measured gas.

Description

technical field [0001] The invention relates to a gas sensor and a preparation method thereof, in particular to a loose and thin-walled metal oxide gas sensor and a preparation method thereof. Background technique [0002] With the rapid development of modern society, the types and quantities of toxic and harmful gases used and produced in industrial production are increasing day by day. At the same time, liquefied petroleum gas, city gas and natural gas are also widely used as household fuel gas. The number of accidents such as explosions and fires caused by gas poisoning and gas leakage is increasing year by year. In recent decades, the problem of air pollution has also attracted widespread attention. Therefore, timely, efficient and reliable monitoring of toxic and harmful gases is a guarantee for the safety of production and life in human society, and it is also one of the problems that human beings pay close attention to and urgently need to solve. [0003] Among man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 苏慧兰由雪玲张荻
Owner SHANGHAI JIAOTONG UNIV