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Nitrogen dioxide gas sensor containing petal-like SnSe2

A gas sensor, nitrogen dioxide technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of increased energy consumption, unsatisfactory gas characteristics, shortened service life, etc., to achieve small equipment investment and easy acquisition of raw materials , the effect of low price

Inactive Publication Date: 2019-03-26
HAINAN UNICAN SCI & TECH INNOVATION INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 containing petal-like SnSe2
  • Nitrogen dioxide gas sensor containing petal-like SnSe2
  • Nitrogen dioxide gas sensor containing petal-like SnSe2

Examples

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Effect test

Embodiment 1

[0033] Petal-like SnSe 2 The 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 composition of the gas-sensing material is a petal-shaped tin diselenide nano-material prepared by a hydrothermal method. The leaves of the material grow loosely and evenly, and are in the shape of a curved sheet. The thickness of the leaf-like structure is about 45nm, and the particle size is about 0.8um. The preparation method comprises the following steps:

[0034] Step 1, 1.8mL C 2 h 8 N 2 , 34.2mL (CH 2 Oh) 2 Pour it into a 50mL beaker, add 406.2mg stannous chloride dihydrate and 142.1mg selenium powder, stir it magnetically for 20 minutes, pour it into a 50mL polytetrafluoroethylene liner, put it into a reaction kettle, put it into a muffle furnace, and Heating at a speed of 3-5°C / min, the reaction temperature is 180°C, the reaction time ...

Embodiment 2

[0041] Petal-like SnSe 2 The 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 composition of the gas-sensitive material is a petal-shaped tin diselenide nanomaterial prepared by a hydrothermal method. The leaf surface of the material is smooth, the thickness of the leaf-like structure is about 60nm, the particle size is about 1.0um, and the particle size is about 1.5um. The preparation method comprises the following steps:

[0042] Step 1, prepare petal-shaped tin diselenide: 2.4mL 2 h 8 N 2 , 45.6mL (CH 2 Oh) 2 Mix, then add 541.6mg of stannous chloride dihydrate and 189.5mg of selenium powder, stir magnetically for 30 minutes and then pour into the reaction kettle for reaction. The reaction temperature is 180°C and the reaction time is 12 hours. Wash repeatedly with carbon disulfide-free solution, then with ionized wat...

Embodiment 3

[0046] Petal-like SnSe 2 The 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 1 μm. The composition of the gas-sensitive material is a petal-shaped tin diselenide nanomaterial prepared by a hydrothermal method. The leaves of the material have smooth surfaces but are of different sizes. The thickness of the leaf-like structure is about 40 nm, and the particle size is about 1.3 um. The preparation method comprises the following steps:

[0047] Step 1, prepare petal-shaped tin diselenide: 1.6mLLC 2 h 8 N 2 , 30.4mL (CH 2 Oh) 2 After mixing, add 361mg of stannous chloride dihydrate and 126.3mg of selenium powder, stir magnetically for 20min and then pour into the reaction kettle for reaction. The reaction temperature is 165°C and the reaction time is 3hh. Wash repeatedly with carbon disulfide-free solution, then with ionized water and a...

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Abstract

The invention discloses a nitrogen dioxide gas sensor containing petal-like SnSe2. The nitrogen dioxide gas sensor comprises a gas sensitive material and a heating substrate, wherein the heating substrate is coated with the gas sensitive material, the coating thickness ranges from 1-100 micrometers, and the gas sensitive material is prepared from a petal-like SnSe2 nanomaterial. A preparation process includes the following steps: step 1, mixing 1.6-2.4 mL of C2H8N2 with 30.4-45.6 mL of (CH2OH)2, adding 361-541.6 mg of stannous chloride dihydrate and 126.3-189.5 mg of selenium powder, performing magnetic stirring for 20-30 minutes, pouring the mixture into a reaction kettle for 3-12 hours of reaction at the temperature of 165-180 DEG C, separating an obtained black product by a centrifugalmachine, repeatedly performing washing until the pH of waste liquid is 6.5-7.5, and drying the waste liquid at the temperature of 80 DEG C for 6-12 hours to obtain the petal-like SnSe2; step 2, preparing SnSe2 dispersion liquid; step 3, coating the dispersion liquid onto the heating substrate, and drying the heating substrate in a drying box at the temperature of 80 DEG C to obtain the nitrogen dioxide gas sensor. The nitrogen dioxide gas sensor provided by the invention has the advantages of simple process step, low cost and sensitive response to nitrogen dioxide.

Description

technical field [0001] The invention belongs to the technical field of nitrogen dioxide gas sensors, in particular to petal-shaped SnSe 2 nitrogen dioxide gas sensor. Background technique [0002] Effective detection and quantification of toxic and harmful gases is particularly important for environmental monitoring and human health protection. A gas sensor is a converter that converts a certain gas concentration 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 one of the most common toxic gases that cause air pollution. Nitrogen dioxide in human production activities mainly comes from motor vehicle exhaust and boiler exhaust gas emissions. When the human body is exposed to ppm level (parts per million) nitrogen dioxide for a long time, it will increase the risk of respiratory diseases. Therefore it is particularly i...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 林仕伟李欣宇李晓干张俊平陈汉德周义龙顾丁刘炜王雪燕
Owner HAINAN UNICAN SCI & TECH INNOVATION INST CO LTD
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