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Amorphous tin dioxide-modified multilayer cobalt oxide material and its preparation method and formaldehyde gas-sensing detection application

A technology of tin dioxide and cobalt oxide, which is applied in the direction of tin oxide, cobalt oxide/cobalt hydroxide, analytical materials, etc., can solve the problems of high detection temperature requirements and inability to realize trace detection, and achieve simple preparation process and satisfy Highly sensitive and reproducible results

Active Publication Date: 2022-05-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this material can only detect 100ppm toluene at 200°C, which requires high detection temperature and cannot achieve trace detection

Method used

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  • Amorphous tin dioxide-modified multilayer cobalt oxide material and its preparation method and formaldehyde gas-sensing detection application
  • Amorphous tin dioxide-modified multilayer cobalt oxide material and its preparation method and formaldehyde gas-sensing detection application
  • Amorphous tin dioxide-modified multilayer cobalt oxide material and its preparation method and formaldehyde gas-sensing detection application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of amorphous tin dioxide modified multilayer cobalt oxide material and preparation method thereof

[0039] (1) Preparation of multilayer cobalt oxide materials

[0040] There are many methods for preparing cobalt-based coordination polymer precursors in the prior art, and the present invention uses a hydrothermal reaction method to prepare the precursors. Add 30mg of cobalt nitrate hexahydrate and 20mg of isophthalic acid into the mixed solution of 5mL of acetone and 5mL of dimethylamide, stir and mix thoroughly, pour into the reaction kettle, react at 160°C for 4 hours, and then centrifuge , and obtain a precursor after drying. Weigh 60 mg of the precursor and put it into a muffle furnace, raise the temperature up to 500°C at a rate of 5°C / min at room temperature, then calcinate at 500°C in an air atmosphere for 10 minutes, and naturally cool down to room temperature to obtain a multilayer shell cobalt oxide material.

[0041] (2) Preparation of amorphous tin...

Embodiment 2

[0047] Oxygen vacancies regulation method of different amorphous tin dioxide modified multilayer cobalt oxide materials

[0048] The difference between this example and Example 1 is that in step (2.3), the oil bath reaction time was adjusted from 1h to 0.5h, 1.5h and 2h, and the rest were the same as in Example 1, and the obtained materials were named CoSn- 0.5, CoSn-1.5, CoSn-2. By controlling the electrodisplacement reaction time, the reaction intensity of tin ions replacing cobalt ions can be controlled, and then the controllable adjustment of the surface oxygen vacancy defect concentration can be realized. Such as Figure 4 As shown, with the change of reaction time, the oxygen vacancy defect O ov The proportion in the O1s spectrum also changed.

Embodiment 3

[0050] Formaldehyde detection application of amorphous tin dioxide modified multi-layer cobalt oxide material

[0051] (1) The amorphous tin dioxide modified multilayer cobalt oxide material prepared in Example 1-2: CoSn-0.5, CoSn-1, CoSn-1.5 and CoSn-2 were mixed with absolute ethanol to form a slurry, and placed side by side Disperse in an ultrasonic disperser for 10 minutes to reduce particle agglomeration.

[0052] (2) Coat the uniform thin paste gas-sensing slurry on the Al with electrodes at both ends 2 o 3 The ceramic tube was left to dry naturally to obtain a uniformly coated gas sensor. The obtained gas sensor was placed on a gas aging bench and aged at 200° C. for 5 days.

[0053] (3) Place the gas sensor prepared in the above steps on the test gas sensor test platform, and perform gas sensor performance tests on CoSn-0.5, CoSn-1, CoSn-1.5, and CoSn-2 sensors at a test temperature of 100-300°C. The relationship curves of the responsivity of each sensor to gases s...

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Abstract

The invention discloses an amorphous tin dioxide-modified multilayer cobalt oxide material, which is characterized in that it comprises a cobalt oxide multilayer shell structure nested layer by layer, and the outer diameter of the cobalt oxide multilayer shell structure is 1-2 μm , each shell layer of the cobalt oxide multilayer shell structure is uniformly decorated with tin dioxide amorphous crystals. The preparation method is to calcine the cobalt-based coordination polymer precursor at high temperature to obtain a cobalt oxide multilayer shell structure; immerse the cobalt oxide multilayer shell structure in an organic solvent, stir, and ultrasonically treat until uniformly dispersed, then heat in an oil bath and add The tin source solution is subjected to an electrical displacement reaction to obtain an amorphous tin dioxide-modified multilayer cobalt oxide material. The invention can realize the effective regulation and control of the electronic structure, improve the gas sensitive response ability of the material, and realize the high responsivity, low detection temperature and low test limit detection to the target gas.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing materials, and in particular relates to an amorphous tin dioxide-modified multi-layer cobalt oxide gas-sensing material prepared by electro-displacement reaction and its application in formaldehyde gas-sensing detection. Background technique [0002] With the rapid development of industrialization, people's living standards are constantly improving, which brings various environmental pollution problems while gaining economic and social benefits. For people who have been active indoors for a long time, formaldehyde is the main pollutant in indoor air, threatening people's physical and mental health. As the main component of adhesives, formaldehyde is also widely present in various man-made panels. The formaldehyde in these panels will be released slowly over time, which will have a huge impact on people's physical and mental health. If long-term exposure to low-concentration formaldehyde can c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04C01G19/02G01N33/00B82Y30/00B82Y40/00
CPCC01G51/04C01G19/02G01N33/0047B82Y30/00B82Y40/00C01P2004/64C01P2004/61C01P2004/86Y02A50/20
Inventor 王晓徐锡金黄金昭朱存光刘文菁王同凯
Owner UNIV OF JINAN
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