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Double-layer structure SnO2-based methane sensor capable of resisting HMDSO poisoning and preparation method of double-layer structure SnO2-based methane sensor

A methane sensor, double-layer structure technology, applied in the fields of instruments, scientific instruments, material resistance, etc., can solve the problems of blocking active sites, few, and reducing the response performance of the sensor, and achieves short response recovery time and short-term repeatability. The effect of good and excellent response performance

Pending Publication Date: 2022-03-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to some previous literature reports, hexamethyldisiloxane is mainly adsorbed on gas-sensitive materials and further cracked into organic silicon, silicate, SiO 2 etc., blocking the active sites on the surface of the gas-sensitive material, thereby reducing the response performance of the sensor
However, there is little literature on how to design specific gas-sensing materials and optimize the sensor to resist organosilicon poisoning

Method used

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  • Double-layer structure SnO2-based methane sensor capable of resisting HMDSO poisoning and preparation method of double-layer structure SnO2-based methane sensor
  • Double-layer structure SnO2-based methane sensor capable of resisting HMDSO poisoning and preparation method of double-layer structure SnO2-based methane sensor
  • Double-layer structure SnO2-based methane sensor capable of resisting HMDSO poisoning and preparation method of double-layer structure SnO2-based methane sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a double-layered SnO anti-HMDSO poisoning 2 Methyl methane sensor, the sensor is a thermal sensor, made of Al 2 o 3 Composed of ceramic tube 1, two ring-shaped gold electrodes 2, four platinum wire leads 3, sensitive inner layer 4, anti-virus outer layer 5, chrome-nickel heating wire 6, and hexapod socket 7; two ring-shaped gold electrodes 2 are parallel interval set at Al 2 o 3 On the ceramic tube 1, two platinum wire leads 3 are connected to each gold electrode 2, and the sensitive inner layer 4 is coated with Al 2 o 3 The outer surface of the ceramic tube 1, the anti-virus outer layer 5 is coated on the outer surface of the sensitive inner layer 4, and the chromium-nickel heating wire 6 passes through the Al 2 o 3 Inside the ceramic tube 1, the two ends of the chrome-nickel heating wire 6 and the Al 2 o 3 The four platinum wire leads 3 of the ceramic tube 1 are jointly welded on the hexapod socket 7; wherein, the material of the se...

Embodiment 2

[0057] The difference from Example 1 is that in step (2), the amount of alumina fiber cotton is 1 g. Others are all the same as in Example 1.

Embodiment 3

[0059] The difference from Example 1 is that in step (2), the amount of alumina fiber cotton is 1.5 g. Others are all the same as in Example 1.

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Abstract

The invention belongs to the technical field of methane sensor preparation, and discloses an HMDSO poisoning-resistant double-layer structure SnO2-based methane sensor and a preparation method thereof. The sensor is an indirectly-heated sensor and is composed of an Al2O3 ceramic tube, two annular gold electrodes, four platinum wire leads, a sensitive inner layer, an anti-toxic outer layer, a chromium-nickel heating wire and a six-pin tube base. Wherein the sensitive inner layer is made of SiO2 surface grafted and modified SnO2, and the anti-toxic outer layer is made of SnO2-loaded alumina fibers. The preparation method comprises the following steps: (1) preparing a sensitive inner layer material-SiO2 surface grafting modified SnO2; (2) preparing an anti-toxic outer layer material, namely alumina fiber loaded with SnO2; and (3) firstly coating a sensitive inner layer material according to a preparation process of an indirectly-heated sensor, and then coating an anti-toxic outer layer material to prepare the SnO2-based methane sensor with the double-layer structure. The sensor element prepared by the invention can effectively resist the poisoning effect of HMDSO, and can keep stable on various indexes such as V0, Vg, SR and the like.

Description

technical field [0001] The invention belongs to the technical field of methane sensor preparation, in particular to a double-layer structure SnO anti-HMDSO poisoning 2 Methyl methane sensor and its preparation method. Background technique [0002] As an important fossil fuel, methane is the main component of natural gas and coal gas beds. It hardly produces any waste when burned. It is an excellent fuel for power generation, industry, chemical industry and residential life. Methane is a flammable and explosive gas, its explosion range in air is 5%-16%, and it is very easy to explode when it encounters an open flame. Due to the continuous popularization of natural gas in residents' lives, the explosion and poisoning accidents caused by natural gas leakage are also increasing, and the safe use of gas has aroused people's great attention. Therefore, the demand for real-time and effective monitoring of methane is also increasing, and the gas monitoring technology has also been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 詹自力李迎超刘文昕
Owner ZHENGZHOU UNIV