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Preparation method and application of carbon-doped mesoporous metal oxide acetone sensor

A technology of oxides and sensors, which is applied in metal material coating technology, instruments, scientific instruments, etc., can solve the problems of low sensitivity and narrow detection range of gas sensors, and achieve the advantages of avoiding mutual influence, good reliability and large heat capacity Effect

Inactive Publication Date: 2013-05-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen from the references that the gas sensor has low sensitivity and narrow detection range

Method used

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  • Preparation method and application of carbon-doped mesoporous metal oxide acetone sensor
  • Preparation method and application of carbon-doped mesoporous metal oxide acetone sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: MWNTFe 3 o 4 resolve resolution one

[0036] Pipette 20 mL of ethylene glycol, add 1.1 g FeCl 3 ?6H 2 O, sonicate to dissolve, under magnetic stirring, add 2.8 g of anhydrous sodium acetate and 9.6 mL of anhydrous ethylenediamine, and add multi-walled carbon nanotubes at the same time, stir vigorously for 20 min, and place the mixture in polytetrafluoroethylene In a reaction kettle of ethylene, react at 200°C for 7.0 h, then cool naturally to room temperature, wash with water until the solution is neutral, and dry the solid in a vacuum oven at 50°C for 6.0 h to obtain MWNTFe 3 o 4 ; The diameter of the multi-walled carbon nanotubes is 8 nm, the length is 50 μm, and the purity is greater than 95%; the ethylenediamine is excessive, so that the surface of the prepared mesoporous ferric oxide has amino groups, containing The amount of amino groups is 0.2 μg / mg; multi-walled carbon nanotubes and Fe 3 o 4 The mass ratio is 0.02:1.

Embodiment 2

[0037] Example 2: MWNTFe 3 o 4 resolve resolution two

[0038] Pipette 20 mL of ethylene glycol, add 1.2 g FeCl 3 ?6H 2O, sonicate to dissolve, under magnetic stirring, add 2.9 g of anhydrous sodium acetate and 9.7 mL of anhydrous ethylenediamine, and add multi-walled carbon nanotubes at the same time, stir vigorously for 22 min, and place the mixture in polytetrafluoroethylene In a reaction kettle of ethylene, react at 200°C for 7.5 h, then cool naturally to room temperature, wash with water until the solution is neutral, and dry the solid in a vacuum oven at 55°C for 5.0 h to obtain MWNTFe 3 o 4 The diameter of the multi-walled carbon nanotubes is 12 nm, the length is 50 μm, and the purity is greater than 95%; the ethylenediamine is excessive, so that the surface of the prepared mesoporous ferric oxide has amino groups, and the amino groups contained The amount is 0.10 μg / mg; multi-walled carbon nanotubes and Fe 3 o 4 The mass ratio is 0.04:1.

Embodiment 3

[0039] Example 3: MWNTFe 3 o 4 Synthetic method three

[0040] Pipette 20 mL of ethylene glycol, add 1.1 g FeCl 3 ?6H 2 O, sonicate to dissolve, under magnetic stirring, add 2.9 g of anhydrous sodium acetate and 9.8 mL of anhydrous ethylenediamine, and add multi-walled carbon nanotubes at the same time, stir vigorously for 25 min, and place the mixture in polytetrafluoroethylene In a reaction kettle of ethylene, react at 200°C for 8.0 h, then naturally cool to room temperature, wash with water until the solution is neutral, and dry the solid in a vacuum oven at 60°C for 5.0 h to obtain MWNTFe 3 o 4 The diameter of the multi-walled carbon nanotubes is 10 nm, the length is 50 μm, and the purity is greater than 95%; the ethylenediamine is excessive, so that the surface of the prepared mesoporous ferric oxide has amino groups, and the amino groups contained The amount is 0.15 μg / mg; multi-walled carbon nanotubes and Fe 3 o 4 The mass ratio is 0.1:1.

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Abstract

The invention relates to a preparation method and application of a carbon-doped mesoporous metal oxide acetone sensor. A gas sensor adopts a heater type device structure and takes an alumina ceramic tube as a carrier. A forked gold electrode is applied to the outer surface of the gas sensor. Platinum extraction electrodes are arranged at the two ends of the gas sensor. A heater strip is arranged in the ceramic tube. A gas sensitive material is coated on the outside of the ceramic tube and is multiwalled carbon nanotube doped monodisperse mesoporous ferroferric oxide. The gas sensor is prepared by preparing the alumina ceramic tube on which the material is coated into a tube core and then welding, packaging and aging the tube core. The preparation method is simple in process, mild in conditions and low in cost and is especially suitable for volume production. The prepared gas sensitive element is used for detecting the acetone concentration at 270-290 DEG C, has the characteristics of high sensitivity to 1-5400ppm acetone, good restorability, quick response and the like and can be used for determining acetone concentration in cosmetic and industrial production and environment detection.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon-doped mesoporous metal oxide acetone sensor, and belongs to the field of preparation technology of functional materials and metal oxide semiconductor gas sensor. Background technique [0002] Due to the rapid development of science and technology and the continuous improvement of industrial modernization, the types and quantities of gases used and produced in the production process are constantly increasing. Many of these gases are flammable and explosive, such as methane, acetylene, hydrogen and liquefied petroleum gas, etc.; many gases are highly toxic, such as carbon monoxide, hydrogen sulfide and nitrogen oxides. [0003] In order to ensure production safety, it is necessary to strengthen monitoring and qualitative analysis of gas in production, use, transportation, storage, etc. Among many sensors, the application of gas sensors stands out, with broad application prospects a...

Claims

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Application Information

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IPC IPC(8): G01N27/00B81C1/00
Inventor 魏琴杜斌冯锐王志玲王玉兰吴丹张勇马洪敏高亮王晓东
Owner UNIV OF JINAN
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