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Cobalt tetroxide gas sensor, its preparation method, application and ozone-assisted n-butanol gas testing method

A technology of tricobalt tetroxide gas and testing methods, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems that the sensitivity needs to be further improved, and achieve the effects of easy adsorption, high selectivity, and good selectivity

Active Publication Date: 2022-03-29
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people have improved the gas-sensing performance of this kind of materials through different doping and improving the preparation process conditions, but their sensitivity still needs to be further improved.

Method used

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  • Cobalt tetroxide gas sensor, its preparation method, application and ozone-assisted n-butanol gas testing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] References (Conductometric ozone sensor based on mesoporous ultrafineCo 3 o 4 nanobricks) to synthesize a hollow tricobalt tetroxide material, which first synthesizes cobalt hydroxide through a solvothermal reaction, and then obtains a hollow tricobalt tetroxide material by calcining, which includes the following steps:

[0054] (1) 35.06g (0.1mol) SnCl 4 ·5H 2 O was dissolved in 0.4L absolute ethanol under stirring, and 21.0g (0.1mol) of C 8 h 8 o 7 ·H 2 O was dissolved in 0.4L water to obtain solution Ⅰ;

[0055] (2) 23.79g (0.1mol) CoCl 2 ·6H 2 O was dissolved in 0.4L water under stirring to obtain solution II;

[0056] (3) Mix the solution I obtained in step 1) with the solution II obtained in step 2) under stirring, and stir evenly to obtain a mixed solution. Add 0.4L, 2mol / L NaOH solution to the mixed solution, stir for a certain period of time, and then add 1L , 8mol / L NaOH solution was stirred for 15min, then the resulting mixture was transferred to a...

Embodiment 2

[0059] Obtain the test that test case detects n-butanol gas under ozone atmosphere with embodiment 1, it may further comprise the steps:

[0060] (1) At a working temperature of 100°C and a humidity of 40%, keep the air pressure in the test box (the atmosphere in the box is an ambient atmosphere without n-butanol pollution) and the atmosphere constant, start the test, and calculate the resistance value of the element;

[0061] (2) Open the air inlet channel and close the air outlet channel. Access O 3 , to reach 100ppmO in the test chamber 3 After the concentration, close the intake channel, and calculate the resistance value of the element after the test is stable for a period of time.

[0062] (3) Calibrate the content of n-butanol, push the n-butanol into the evaporator through the sampling device to evaporate, close the intake channel after the concentration of n-butanol reaches 10ppm, and calculate the resistance value of the element after a period of test response.

...

Embodiment 3

[0066] Obtain the test that test case detects n-butanol gas under ozone atmosphere with embodiment 1, it may further comprise the steps:

[0067] (1) At a working temperature of 100°C and a humidity of 40%, keep the air pressure in the test box (the atmosphere in the box is an ambient atmosphere without n-butanol pollution) and the atmosphere constant, start the test, and calculate the resistance value of the element;

[0068] (2) Open the air inlet channel and close the air outlet channel. Access O 3 , to reach 100ppmO in the test chamber 3 After the concentration, close the intake channel, and calculate the resistance value of the element after the test is stable for a period of time.

[0069] (3) Calibrate the content of n-butanol, push n-butanol into the evaporator through the sampling device to evaporate, close the intake channel after reaching 100ppm n-butanol concentration, and calculate the resistance value of the element after a period of test response.

[0070] (4...

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Abstract

The invention belongs to the technical field of semiconductor gas sensor components, and in particular relates to a cobalt trioxide gas sensor, its preparation method, application and an ozone-assisted n-butanol gas testing method. The ozone-assisted n-butanol gas testing method comprises the steps of: firstly calibrate the relationship curves between n-butanol gas and sensitivity in different contents, and then combine the resistance value of the tricobalt tetroxide gas sensor in the measured gas atmosphere to obtain the normal butanol gas in the measured gas. content of butanol gas. The method has high sensitivity and selectivity, thereby realizing the detection of n-butanol gas under a certain ozone concentration, and the sensitivity is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor gas sensor components, and in particular relates to a cobalt trioxide gas sensor, its preparation method, application and an ozone-assisted n-butanol gas testing method. Background technique [0002] Butanol is a kind of volatile organic compounds (VOCs), which is widely used as solvent, organic synthesis intermediate and extractant. Prolonged exposure to n-butanol may cause symptoms such as headache, dizziness, drowsiness, dermatitis, eye, nose and throat discomfort, so efficient and rapid detection of n-butanol is of great significance to human health. [0003] Metal oxides such as ZnO, SnO 2 、Co 3 o 4 Due to the advantages of excellent performance, environmental friendliness, abundant resources, and low price, it is a widely studied gas-sensing material. At present, people have improved the gas-sensing performance of this kind of material through different doping and improving the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 林志东李婷王思煜付萍陈喆
Owner WUHAN INSTITUTE OF TECHNOLOGY