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Ceramic gas-sensitive sensor for alcohol detection

A gas sensor and alcohol detection technology, which is applied in the field of gas sensors, can solve the problems of large initial resistance of the sensor, influence signal transmission, and influence on the operation of signal analysis components, so as to reduce resistivity, improve sensitivity, and improve sensitivity. Effect

Active Publication Date: 2015-10-14
高鑫环保科技(苏州)有限公司
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Problems solved by technology

However, with the deepening of research, the doping of lanthanum will make the initial resistance of the sensor too large, which will affect the operation of signal analysis components and affect the transmission of signals

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0011] Dissolve 0.003g antimony trioxide and 0.5g zinc oxide in 5ml hydrochloric acid (45%) solution and configure salt solution, dissolve 8g tin chloride in 35ml ethanol (70%) to make tin chloride ethanol solution, and Add the salt solution to the tin chloride ethanol solution under stirring conditions and mix it at room temperature for 1 hour, then add an appropriate amount of chelating agent (such as 0.06g polymethacrylic acid) and drop ammonia to adjust the pH to 9.5; filter and recover the precipitate and use ethanol to The precipitate is washed, dried at 80°C after washing, and then sintered at 550°C to obtain doped nano powder. Weigh 0.02-0.05g of yttrium trioxide, 0.18-0.25g of lanthanum trioxide, 100g of the above-prepared doped nano-powder and 25ml of water and mix them in a ball mill to form a gas-sensitive slurry. The tube is washed with deionized water, acetone, and chloroform in sequence. After drying, the inside of the alumina ceramic tube is coated with rutheni...

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PUM

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Abstract

The present invention discloses a ceramic gas-sensitive sensor for alcohol detection. The sensor includes a semiconductor ceramic substrate, a heating material layer, an electrode and a gas-sensitive material layer. The gas-sensitive material layer is obtained by using the following method: preparing antimony trioxide and zinc oxide into a salt solution, preparing tin chloride into a tin chloride ethanol solution, adding the salt solution to the tin chloride ethanol solution for mixed reaction, adding an appropriate amount of a chelating agent, dropwise adding ammonia solution to adjust the pH value to 9.0; filtering and recovering the precipitate, washing and sintering the precipitate to obtain a doped nano powder; weighing yttria, lanthanum oxide, doped nano powder and water, mixing and grinding into a gas-sensitive slurry; and applying the gas-sensitive slurry to the surface of semiconductor ceramic substrate to form a gas-sensitive material. Through blending the proportional change of tin, zinc and lanthanum, the sensitivity of sensitive material layer to alcohol is improved, and the sensitivity of alcohol detection is enhanced; in addition, by introducing antimony and yttrium, the resistivity of sensitive material layer is greatly reduced to ensure reliable operation of the signal analysis component.

Description

technical field [0001] The invention relates to the field of gas sensitive sensors, in particular to a ceramic gas sensitive sensor used for alcohol detection. Background technique [0002] Semiconductor ceramic gas sensor can be used to analyze the content of alcohol vapor in the gas, and is often used for drunk driving detection. The semiconductor ceramic gas sensor is mainly composed of a substrate and a heating material layer, electrodes and a gas-sensing material layer arranged on the surface of the substrate. In order to avoid the influence of other gases in the environment during alcohol detection, elements such as lanthanum and manganese are generally doped in the gas-sensitive material layer to improve the sensitivity of the gas-sensitive material layer to alcohol gas. However, with the deepening of research, lanthanum doping will make the initial resistance of the sensor too large, which will affect the operation of signal analysis components and affect signal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 胡齐放
Owner 高鑫环保科技(苏州)有限公司
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