Method for making gas sensor for room temperature measuring organic alcohols gas

A technology of gas sensing element and manufacturing method, applied in the direction of material resistance, etc., can solve the problems of high operating temperature, poor selectivity, troublesome gas sensing element, etc. Effect

Inactive Publication Date: 2009-05-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SnO 2 , Fe 2 o 3 , CuO and other inorganic metal oxides have defects such as high operating temperature (350-450°C), high energy consumption, potential safety hazards, and poor selectivity.
However, polymer semiconductor polypyrrole, polyaniline, polythiophene, and polyaniline / polyvinyl alcohol composites are more troublesome when making gas sensors. It is necessary to pretreat the ceramic tube and add a binder. The recovery time of the response to alcohol gas is relatively long, ranging from tens to one hundred minutes, which greatly reduces its practical value

Method used

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  • Method for making gas sensor for room temperature measuring organic alcohols gas
  • Method for making gas sensor for room temperature measuring organic alcohols gas
  • Method for making gas sensor for room temperature measuring organic alcohols gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve polyethylene oxide powder with a molecular weight of 100,000 in acetonitrile solvent at a water bath temperature of 30°C at a mass ratio of 1:10, stir continuously until it becomes transparent, and then apply it on The ceramic tube of the fork-shaped gold electrode was dried in a vacuum oven at 40°C for 8 hours to prepare a polyethylene oxide film, and the ceramic tube coated with the polyethylene oxide film was welded on the gas sensor seat. Then test its room temperature at 18°C, the loop voltage V c is 10 V, the load resistor R 1 Its sensitivity to different methanol concentrations is 4.7MΩ and the ambient humidity is 60℅. Such as figure 2 It is shown that when the concentration is 7.9ppm, the sensitivity reaches 5, and when the concentration is 95ppm, the sensitivity reaches 79.5. The gas sensor has high sensitivity to methanol gas.

Embodiment 2

[0027] Dissolve polyethylene oxide powder with a molecular weight of 400,000 in anhydrous methanol at a water bath temperature of 40°C at a mass ratio of 1:40, stir continuously until it becomes transparent, and then apply it On the ceramic tube of the fork-shaped gold electrode, dry it in a vacuum oven at 45°C for 4 hours to prepare a polyethylene oxide film, and weld the ceramic tube coated with the polyethylene oxide film on the gas sensitive seat . Then test its room temperature at 12°C, the loop voltage V c is 10 V, the load resistor R 1 It is 4.7MΩ, and the ambient humidity is 57℅. Its response and recovery performance to methanol concentration is 31.6ppm. Such as image 3 shown. The first 65 minutes in the figure show the response of the PEO gas sensor immersed in 31.6ppm methanol gas, and the 65-85 minutes show the recovery performance when it is taken out of the methanol gas and placed in the air. The sensitivity of the gas sensor immersed in methanol gas increas...

Embodiment 3

[0029] Dissolve polyethylene oxide powder with a molecular weight of 1 million in absolute ethanol at a water bath temperature of 65°C at a mass ratio of 1:60, stir continuously until it becomes transparent, and then apply it On the ceramic tube of the fork-shaped gold electrode, dry it in a drying oven at 50°C for 5 hours to prepare a polyethylene oxide film, and weld the ceramic tube coated with the polyethylene oxide film to the gas sensor seat. Then test its room temperature at 15°C, the loop voltage V c is 10 V, the load resistor R 1 It is 4.7MΩ, and the ambient humidity is 58℅. It is sensitive to different concentrations of ethanol. Such as Figure 4 As shown, the sensitivity increases with the increase of concentration. When the ethanol concentration was 95ppm, the sensitivity reached 19.

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Abstract

This invention discloses one process method to test organic alcohol gas sensitive element with molecule as 10 to 100 million polymer epoxy ethane powder under temperature of 28 to 65 degrees with mass proportion as 1:10-1:60 into electrode agent without interrupting till into transparent; then coating it into cross gold electrode cameras tube for drying to evaporating to process the film and welding the ceramics tube onto gas sensitive socket.

Description

technical field [0001] The invention relates to a method for manufacturing gas-sensing active materials and components, in particular to a method for manufacturing gas-sensing active materials and components for measuring organic alcohol gases at room temperature. Background technique [0002] There are many kinds of gas sensors for the determination of organic alcohol gases, mainly metal oxide inorganic semiconductors, such as SnO 2 , Fe 2 o 3 , CuO, etc., and polymer organic semiconductors, such as polypyrrole, polyaniline, polythiophene, and polyaniline / polyvinyl alcohol composites. However, SnO 2 , Fe 2 o 3 , CuO and other inorganic metal oxides have defects such as high operating temperature (350-450°C), high energy consumption, potential safety hazards, and poor selectivity. However, polymer semiconductor polypyrrole, polyaniline, polythiophene, and polyaniline / polyvinyl alcohol composites are more troublesome when making gas sensors. It is necessary to pretreat ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01N27/12
Inventor唐新村陈春姣
OwnerCENT SOUTH UNIV