Anti-co interference ethanol sensing material

Abstract

The invention relates to an anti-CO interference ethanol sensing material, a preparation method and a gas sensitive sensing element using the sensing material. The ethanol sensing material is composed of 0.1%-0.5% La2O3 powder and 99.9%-99.5% % Sb-doped SnO2 nanometer powder is mixed, and the Sb / Sn molar ratio in the Sb-doped SnO2 nanometer powder is 0.05-0.1%. The preparation method comprises: preparing tin chloride ethanol solution and antimony-containing hydrochloric acid solution according to the above-mentioned Sb / Sn molar ratio, adding the antimony-containing hydrochloric acid solution dropwise into the tin chloride ethanol solution, stirring and mixing, adding a chelating agent, and then Add ammonia water dropwise until the pH value reaches 9.0, take the precipitated product, wash, dry, and sinter to obtain Sb-doped SnO2 nanopowder, and then grind and mix with La2O3 powder according to the above ratio to obtain the final product. The sensing material has a low initial resistance and a much higher response to ethanol than CO.

Description

technical field [0001] The present invention relates to a gas sensitive sensing material and a preparation method, more specifically, to an anti-CO (carbon monoxide) interference ethanol sensing material and a preparation method thereof, and an anti-CO interference gas sensing element, belonging to metal oxide semiconductors Gas sensor technology field. Background technique [0002] In the fields of wine quality management, food and biopharmaceutical industry, and drunk driving breath analysis, the alcohol atmosphere concentration test process is usually involved. At present, there are many methods for detecting the concentration of alcohol atmosphere, such as infrared optical method, electrochemical potential method, resistance type monitoring method and so on. Among various detection methods, the application of the resistance type monitoring method is relatively simple and low in cost. The resistance-type monitoring method mainly involves a semiconductor metal oxide gas-...

AI Technical Summary

Problems solved by technology

[0006] The sensitivity of tin oxide to ethanol gas can be improved very well by the method of doping lanthanum, but this method also has disadvantages, that is, the resistance of the material increases sharply after doping, making the air of the final component Stable initial resistance is very high, usually up to hundreds of megaohms

This high-resistance state is not conducive to the design of the sensor-actuator circuit and the consistency of the mass production of components, because the large distribution range caused by the excessive resistance value causes the initial parameters of the components to be inconsistent.

In addition, excessive initial resistance may easily cause monitoring noise and interference signals, resulting in misoperation of the actuator

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