Nitrogen dioxide gas sensor based on SnSe2/SnO2 heterojunction as well as preparation process and application thereof

A gas sensor, nitrogen dioxide technology, applied in the field of nanomaterials, can solve the problems of increasing energy consumption, unsatisfactory gas characteristics, shortening service life, etc., to promote oxygen adsorption, improve gas sensing performance, slow down material aging and damage effect

Inactive Publication Date: 2018-11-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of semiconductor gas sensor is not ideal for gas characteristics under low temperature conditions. It is usually necessary to install a heating wire on the gas sensor element to make the element meet the optimal working temperature and enhance the sensitivity of the gas sensor.
However, elevating the components to a higher temperature not only increases energy consumption, but also easily deteriorates the performance of the components and shortens the service life

Method used

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  • Nitrogen dioxide gas sensor based on SnSe2/SnO2 heterojunction as well as preparation process and application thereof
  • Nitrogen dioxide gas sensor based on SnSe2/SnO2 heterojunction as well as preparation process and application thereof
  • Nitrogen dioxide gas sensor based on SnSe2/SnO2 heterojunction as well as preparation process and application thereof

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Effect test

Embodiment 1

[0032] A SnSe-based 2 / SnO 2 The heterojunction nitrogen dioxide gas sensor is composed of a gas-sensing material and a heating substrate, and the gas-sensing material is coated on the surface of the substrate with a coating thickness of 100 μm. The gas-sensing material is composed of tin diselenide and tin dioxide heterojunction composite nanomaterials formed by calcining at 500° C. for 1 hour. The preparation method comprises the following steps:

[0033] Step 1, preparation of tin diselenide dispersion: put 5mg-10mg of tin diselenide into a mortar, grind for 15 minutes, then disperse the ground tin diselenide powder into 4mg-5mg of deionized water, and ultrasonicate for 1min Treat it into a dispersion liquid of 8 mg / ml-10 mg / ml with an ultrasonic power of 240W-260W, then take the dispersion liquid and apply it to the surface of the substrate, and place it in a drying oven at 60°C for 5 hours to dry.

[0034] Step 2, preparation of tin diselenide and tin dioxide heterojun...

Embodiment 2

[0038] A SnSe-based 2 / SnO 2 The heterojunction nitrogen dioxide gas sensor is composed of a gas-sensing material and a heating substrate, and the gas-sensing material is coated on the surface of the substrate with a coating thickness of 100 μm. The gas-sensing material is composed of tin diselenide and tin dioxide heterojunction composite nanomaterials formed by calcining at 550° C. for 1 hour. The preparation method comprises the following steps:

[0039] Step 1, preparation of tin diselenide dispersion: put 5mg-10mg of tin diselenide into a mortar, grind for 15 minutes, then disperse the ground tin diselenide powder into 4mg-5mg of deionized water, and ultrasonicate for 1min Treat it into a dispersion of 8 mg / ml-10 mg / ml with an ultrasonic power of 240W-260W, then take the dispersion and coat the surface of the substrate, and place it in a drying oven at 60°C for 5 hours.

[0040]Step 2, preparation of tin diselenide and tin dioxide heterojunction: Take out the substrate...

Embodiment 3

[0042] A SnSe-based 2 / SnO 2 The heterojunction nitrogen dioxide gas sensor is composed of a gas-sensing material and a heating substrate, and the gas-sensing material is coated on the surface of the substrate with a coating thickness of 100 μm. The gas-sensing material is composed of tin diselenide and tin dioxide heterojunction composite nanomaterials formed by calcining at 500° C. for 0.5 h. The preparation method comprises the following steps:

[0043] Step 1, preparation of tin diselenide dispersion: put 5mg-10mg of tin diselenide into a mortar, grind for 15 minutes, then disperse the ground tin diselenide powder into 4mg-5mg of deionized water, and ultrasonicate for 1min Treat it into a dispersion of 8 mg / ml-10 mg / ml with an ultrasonic power of 240W-260W, then take the dispersion and coat the surface of the substrate, and place it in a drying oven at 60°C for 5 hours.

[0044] Step 2, preparation of tin diselenide and tin dioxide heterojunction: Take out the substrate...

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Abstract

The invention belongs to the technical field of a nanometer material, and provides a nitrogen dioxide gas sensor based on a SnSe2/SnO2 heterojunction as well as a preparation process and application thereof. The nitrogen dioxide gas sensor based on the SnSe2/SnO2 heterojunction mainly consists of a gas sensitive material and a heating base plate, wherein the gas sensitive material is coated on thesurface of the heating base plate; the coating thickness is 1 mum to 100 mum; the gas sensitive material is a heterojunction composite nanometer material formed by ingredients of tin diselenide and tin dioxide. A hot oxidization method is used for obtaining the novel heterojunction composite nanometer material; the raw materials can be conveniently obtained; the price is low; the heterojunction preparation process is simple; the scheme beings to a two-dimensional semiconductor heterojunction preparation scheme with the advantages of low equipment investment and simple technical flow process.The work temperature of nitrogen dioxide made of the tin diselenide and tin dioxide heterojunction composite nanometer material is 120 DEG C; the material and silicon base microelectron phase integration can be realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a SnSe-based 2 / SnO 2 Heterojunction nitrogen dioxide gas sensor, fabrication process and application. Background technique [0002] A gas sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. According to the strength of the electrical signal, information such as the presence of the gas to be measured in the environment can be obtained. Nitrogen dioxide is a toxic gas that plays an important role in the formation of acid rain and ozone. The nitrogen dioxide in human production activities mainly comes from the release of high-temperature combustion processes, such as vehicle exhaust and boiler exhaust emissions. When the concentration of nitrogen dioxide in the environment reaches 20ppm, it will immediately cause serious harm to human life and health. Therefore, how to quickly and accurately detect the content of nitrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李晓干李欣宇王明峰顾丁刘航
Owner DALIAN UNIV OF TECH
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