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CdS/Co3O4 composite material, preparation method and application of CdS/Co3O4 composite material in acetone gas detection under optical excitation

A composite material, optical excitation technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of high maintenance and use, low detection sensitivity, high price, etc., and achieve fast response and high sensitivity. , the effect of a wide detection range

Active Publication Date: 2021-06-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methods for detecting acetone content in gas in the prior art include spectral detection method, chromatographic detection method, electrochemical sensor method, etc. However, spectral detection method and chromatographic detection method all need to use special reagents to carry out gas sampling in the environment to be tested, and then Use specific equipment for detection according to specific methods, for example, gas chromatography requires the use of gas chromatographs, and the specific equipment itself is expensive, maintenance and use of these equipment also have very high costs, and the detection sensitivity is low; electrochemical sensors Use ultraviolet light and electric field ionization to decompose acetone in the ambient gas and convert it into carbon monoxide, and then use electrochemical principles to detect the content of carbon monoxide to determine the content of acetone. The electrochemical sensor can only be measured at a single point, with low response and failure. high rate

Method used

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  • CdS/Co3O4 composite material, preparation method and application of CdS/Co3O4 composite material in acetone gas detection under optical excitation
  • CdS/Co3O4 composite material, preparation method and application of CdS/Co3O4 composite material in acetone gas detection under optical excitation
  • CdS/Co3O4 composite material, preparation method and application of CdS/Co3O4 composite material in acetone gas detection under optical excitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Example 1 CdS / Co 3 o 4 Preparation of composite materials

[0111] Step 1, weigh 0.9g of polyvinylpyrrolidone (PVP) and dissolve it in the first mixed solvent of 5mL of absolute ethanol and 5mL of N,N-dimethylformamide, stir magnetically for 5h to ensure that it is fully dissolved, and then add 2g Co(NO 3 ) 2 ·6H 2 O and stirring continuously until it is completely dissolved to obtain an electrospinning precursor, which is in a liquid state;

[0112] Step 2, transfer the electrospinning precursor prepared in step 1 to a syringe equipped with a No. 22 (inner diameter 0.4mm) stainless steel needle, and install the syringe containing the electrospinning precursor in the injection system of the electrospinning equipment On the fixture, set the feed rate of the electrospinning precursor to 0.707mL / h, the receiver speed to 80r / min, the distance between the syringe and the receiver to be 15cm, and between the stainless steel needle and the receiver Apply a voltage of ...

Embodiment 2

[0128] Example 2 CdS / Co 3 o 4 Preparation of composite materials

[0129] Step 1, weigh 0.8g polyvinyl alcohol (PVA) and dissolve it in the first mixed solvent of 5mL absolute ethanol and 5mL N,N-dimethylformamide, stir magnetically at 90°C for 5h to fully dissolve the PVA, Then add 1.6g Co(NO 3 ) 2 ·6H 2 O and stirring continuously until it is completely dissolved to obtain an electrospinning precursor, which is in a liquid state;

[0130] Step 2, transfer the electrospinning precursor prepared in step 1 to a syringe equipped with a No. 22 (inner diameter 0.4mm) stainless steel needle, and install the syringe containing the electrospinning precursor in the injection system of the electrospinning equipment On the fixture, set the feed rate of the electrospinning precursor to 0.707mL / h, the receiver speed to 60r / min, the distance between the syringe and the receiver to be 15cm, and between the stainless steel needle and the receiver Apply a voltage of 15kv;

[0131] D...

Embodiment 3

[0134] Example 3 CdS / Co 3 o 4 Preparation of composite materials

[0135] Step 1, weigh 0.8g of polyvinylpyrrolidone (PVP) and dissolve it in 5.5mL of absolute ethanol and 5.5mL of N,N-dimethylformamide mixed first solvent, stir magnetically for 5h to fully dissolve PVP, then add 2g Co(NO 3 ) 2 ·6H 2 O and stirring continuously until it is completely dissolved to obtain an electrospinning precursor, which is in a liquid state;

[0136] Step 2, transfer the electrospinning precursor prepared in step 1 to a syringe equipped with a No. 22 (inner diameter 0.4mm) stainless steel needle, and install the syringe containing the electrospinning precursor in the injection system of the electrospinning equipment On the fixture, set the feed rate of the electrospinning precursor to 0.707mL / h, the receiver speed to 60r / min, the distance between the syringe and the receiver to be 15cm, and between the stainless steel needle and the receiver Apply a voltage of 15kv;

[0137] During...

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Abstract

The invention discloses a CdS / Co3O4 composite material and a preparation method and application thereof. The CdS / Co3O4 composite material comprises Co3O4 nanofibers and CdS nanoparticles attached between the Co3O4 nanofibers, the diameter of the Co3O4 nanofibers ranges from 200 nm to 300 nm, the diameter of the CdS nanoparticles ranges from 300 nm to 400 nm. The CdS / Co3O4 composite material can be made into a gas sensitive element, an acetone gas sensor and a light excitation gas sensitive test platform, and the CdS / Co3O4 composite material and a product thereof can detect acetone gas at room temperature (25 DEG C), have the advantages of high sensitivity, short response recovery time, good selectivity and the like, and are wide in detection range and suitable for industrial production. The problem that a traditional acetone gas sensor is poor in gas-sensitive characteristic in a low-temperature and low-gas-concentration area is effectively solved.

Description

technical field [0001] The application belongs to the application field of semiconductor oxides, in particular to a CdS / Co 3 o 4 Composite material, preparation method and its application in detection of acetone gas under light excitation. Background technique [0002] Acetone is a colorless, flammable, and volatile compound widely used in explosives, paints, and plastics. It has a pungent odor. Long-term exposure to acetone vapor will seriously endanger human health, causing eye inflammation, dizziness, Symptoms such as fatigue, bronchitis, and even organ damage in severe cases. On the other hand, with the continuous development of medical technology, the detection of biomarker acetone in exhaled breath has become a new method for non-invasive diagnosis of diabetes in medicine in recent years. At present, the generally accepted standard in the medical field is that the concentration of acetone in the exhaled breath of healthy people is about 0.3-0.9ppm, while that of dia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G11/02C01G51/04G01N27/12
CPCC01G51/04C01G11/02G01N27/127C01P2002/72C01P2004/03C01P2004/62C01P2004/61Y02A50/20
Inventor 张冬至郭敬宇李停停
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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