Method for producing gas sensor for detecting novel refrigerant HC-600a

A technology of gas sensor and refrigerant gas, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of hidden dangers in production safety, low detection accuracy and selectivity, and achieve good stability and response recovery Short time, good selectivity

Inactive Publication Date: 2009-04-01
SHANGHAI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Although some existing combustible gas sensors on the market can also be used to detect HC-600a, their detection accuracy and selectivity are very low, which cannot meet the professional detection standards and leave hidden dangers to safe production

Method used

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  • Method for producing gas sensor for detecting novel refrigerant HC-600a
  • Method for producing gas sensor for detecting novel refrigerant HC-600a
  • Method for producing gas sensor for detecting novel refrigerant HC-600a

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Embodiment 1

[0020] Embodiment 1: The preparation process and steps of the refrigerant HC-600a gas sensor in this embodiment are as follows:

[0021] (1) Take 0.007g SnCl 4 ·5H 2 O was dissolved in 100ml deionized water under stirring conditions. Then add 0.54gFeCl 3 ·6H 2 O, stirred for 30min to obtain a khaki transparent solution A. Mix 20ml ammonia water and 20ml deionized water evenly to obtain solution B. Add solution B dropwise to solution A under stirring condition, and a reddish-brown precipitate can be obtained. Continue to titrate until pH=5 to stop the titration. The precipitate was separated by centrifugation and washed with deionized water to completely remove Cl - . Vacuum-dried at 50°C for 24 hours to obtain reddish-brown particles. After the particles are ground and refined, they are calcined at 650°C for 2 hours to obtain SnO 2 -Fe 2 o 3 Binary nanocomposite powder.

[0022] (2) Put the above materials in a mortar, and add HAuCl with a molar ratio of 1:1 drop ...

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Abstract

The invention relates to a preparation method of a gas-sensitive element used for detecting a novel refrigerant, HC-600a, belonging to the technical field of the preparation process of a metal oxide semiconductor gas-sensitive element. The material of the gas-sensitive element of the invention is based on SnO2-Fe2O3 dibasic nano composite material, wherein, the mole ratio of Sn/Fe is 1 to 15: 100; noble metal elements, Au and Ru, with the mass percentage of 0.1 percent to 1.0 percent are doped by a dipping method, the doped gas-sensitive material is obtained, then is ground, and stirred to be pasty by a proper amount of deionized water and polyethylene glycol; and the pasty gas-sensitive material is uniformly coated on the surface of an aluminium oxide ceramic tube and is processed for two hours by annealing at the temperature of 500 DEG C so as to obtain the gas-sensitive element used for detecting the novel refrigerant HC-600a. The gas-sensitive element prepared by the invention has the advantages of high gas sensitivity to the refrigerant, HC-600a, good selectivity to interference gas, short time for response and recovery, good stability and the like, and can be used in the fields of leak detection of the novel and environment-friendly refrigerant, HC-600a, and detection of relevant industries of isobutene.

Description

technical field [0001] The invention relates to a preparation method of a gas sensor for detecting novel refrigerant HC-600a, which belongs to the technical field of metal oxide semiconductor gas sensor preparation technology. Background technique [0002] The early refrigerator refrigerant was Freon. Recent studies have shown that it will destroy the ozone layer in the atmosphere and cause the global greenhouse effect. Therefore, many developed countries have banned the use of Freon, and China also plans to phase out this refrigerant. Therefore, it is urgent to find an alternative product as a refrigerator refrigerant. Among them, HC-600a (CH 3 CH(CH 3 )CH 3 ) has gradually become the new darling of the refrigerant market due to its non-destructive effect on the ozone layer, zero greenhouse effect, and environmental protection and energy-saving significance. [0003] The main component of HC-600a is isobutane. it belongs to C x h y It is a combustible gas with an ign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/407
Inventor 王丁张娟徐甲强李辉向群潘庆谊
Owner SHANGHAI UNIV
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