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Gold-modified flower-like SnS2 nitrogen dioxide gas sensor and preparation method thereof

A technology of gas sensor and nitrogen dioxide, which is applied in the direction of nanotechnology for sensing, instruments, scientific instruments, etc., can solve the problems of high power consumption and limit the wide application of gas sensors, and achieve low heat loss and convenient raw material acquisition , cheap effect

Inactive Publication Date: 2020-05-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above SnS 2 The gas sensor needs to work at high temperature and has high power consumption, which greatly limits the wide application of gas sensor

Method used

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  • Gold-modified flower-like SnS2 nitrogen dioxide gas sensor and preparation method thereof
  • Gold-modified flower-like SnS2 nitrogen dioxide gas sensor and preparation method thereof
  • Gold-modified flower-like SnS2 nitrogen dioxide gas sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step one, prepare SnS 2 Nano flower material: 0.54g SnCl 4 ·5H 2 O and 0.49 g of thioacetamide (TAA) were dissolved in 30 mL of isopropanol. After vigorous stirring for 30 minutes, the solution was transferred to a 50 mL autoclave, sealed and hydrothermally heated at 180°C for 16 hours. Then the autoclave was cooled to room temperature, and finally the golden precipitate was collected by centrifuging the mixture, washed with deionized water and absolute ethanol several times, and then dried at 80°C for 12 hours for further characterization and use;

[0028] Step two, prepare gold modified SnS 2 Nanoflower material: Disperse 50mg of the powder obtained in step 1 in 30ml deionized water, and add 2ml 0.01mol / l L-lazyine solution as a dispersant to make SnS 2 The nanoflower powder is uniformly dispersed in deionized water and stirred for 10-15 minutes, then 1ml of 0.000075mol / l chloroauric acid solution is added and stirred for 30min, then 3ml of 0.1mol / l sodium citrate solutio...

Embodiment 2

[0032] Step one, prepare SnS 2 Nano flower material: 0.54g SnCl 4 ·5H 2 O and 0.49 g of thioacetamide (TAA) were dissolved in 30 mL of isopropanol. After vigorous stirring for 30 minutes, the solution was transferred to a 50 mL autoclave, sealed and hydrothermally heated at 180°C for 16 hours. Then cool the autoclave to room temperature, and finally collect the golden precipitate by centrifuging the mixture, wash it with deionized water and absolute ethanol several times, and then dry it at 80°C for 12 hours for further characterization and use;

[0033] Step two, prepare gold modified SnS 2 Nanoflower material: Disperse 50mg of the powder obtained in step 1 in 30ml deionized water, and add 2ml 0.01mol / l L-lazyine solution as a dispersant to make SnS 2 The nanoflower powder is uniformly dispersed in deionized water and stirred for 10-15 minutes, then 1ml of 0.00125mol / l chloroauric acid solution is added and stirred for 30 minutes, and then 3ml of 0.1mol / l sodium citrate solution ...

Embodiment 3

[0036] Performance test of nitrogen dioxide gas sensor:

[0037] The gold-modified flower-like SnS prepared in step 3 in Example 1 2 The gas sensor is placed in an air atmosphere, and nitrogen dioxide gas molecules are introduced at the optimal working temperature of 100°C. The resistance change of the sensor in the air and 8ppm nitrogen dioxide atmosphere with the air as the background is measured by a multimeter, as the signal of the sensor.

[0038] figure 2 The gold-modified flower-like SnS prepared in Example 1 is shown 2 Composite materials and simple flower-like SnS 2 A comparison graph of the response of a gas sensor made of materials to 8ppm nitrogen dioxide.

[0039] image 3 The flower-like SnS prepared in Example 1 is given 2 The gas sensor responds to several common volatile interference gases and nitrogen dioxide gas.

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Abstract

The invention belongs to the technical field of gas sensors, and provides a gold-modified flower-like SnS2 nitrogen dioxide gas sensor and a preparation method thereof. The nitrogen dioxide gas sensorcomprises a gas sensitive material and a heating electrode. The gas sensitive material is uniformly coated on the surface of the heating electrode. The gas sensitive material is flower-like SnS2 withuniformly distributed gold, and has a large surface area-volume ratio structure, and Au nanoparticles can be used as an active catalyst with specific catalytic characteristics, and can enhance the diffusion and transfer rate of adsorbed substances from an active site to an inactive site. The gold-modified flower-like structure nano material is prepared by adopting a hydrothermal method and a water bath method, the raw materials are convenient to obtain, the price is low, and the preparation process is simple.

Description

Technical field [0001] The invention belongs to the technical field of electronic components, and specifically relates to a gold-modified flower-shaped SnS2 nitrogen dioxide gas sensor and a preparation method. Background technique [0002] With the development of technology and society, gas sensors, as a converter that converts a certain gas volume fraction into corresponding electrical signals, are widely used in various fields of industry and life, such as petroleum, chemical, steel, metallurgy, mining, Environmental protection, municipal administration, medical treatment, food and many other fields. For example, in the field of environmental protection, gas sensors are used to detect the emission intensity of industrial waste gas pollution sources; in the field of safety, gas sensors are used to monitor the leakage of flammable and explosive gases in coal mines and chemical companies; in the field of medical treatment, gas sensors are used to detect suspected Certain specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y30/00B82Y15/00
CPCB82Y15/00B82Y30/00G01N27/127
Inventor 朱倩琼顾丁李晓干黄宝玉张苏刘炜
Owner DALIAN UNIV OF TECH
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