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Preparation method of tin dioxide-based gas sensor and carbon monoxide gas sensor system

A gas sensor, tin dioxide technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as poor resistance to ethanol interference, and achieve the effects of high working temperature, improved response speed, and high sensitivity

Active Publication Date: 2020-10-30
江苏智闻智能传感科技有限公司
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Problems solved by technology

[0005] A further object of the present invention is to solve the technical problem that carbon monoxide gas sensor anti-ethanol interference ability is poor in the prior art

Method used

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  • Preparation method of tin dioxide-based gas sensor and carbon monoxide gas sensor system
  • Preparation method of tin dioxide-based gas sensor and carbon monoxide gas sensor system
  • Preparation method of tin dioxide-based gas sensor and carbon monoxide gas sensor system

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Embodiment Construction

[0033] figure 1 A schematic flowchart showing a method for preparing a tin dioxide-based gas sensor according to an embodiment of the present invention. Such as figure 1 Shown, this preparation method comprises the steps:

[0034] S100, stirring the tin salt solution evenly at a preset temperature;

[0035] S200, adding a weak base at a preset rate during the stirring process until the pH value of the solution is adjusted to 3-4, and continuing to stir until it is in a gel state;

[0036] S300, drying, grinding and sintering the gel to obtain tin dioxide powder;

[0037] S400, adding a metal salt and a volatile alcohol solvent to the tin dioxide powder, and performing ball milling to obtain a metal-doped tin dioxide-based gas-sensitive slurry;

[0038] S500. Apply metal-doped tin dioxide-based gas-sensing paste to an electrode region on a sensor substrate, and sinter to obtain a tin-dioxide-based gas-sensing element.

[0039] In step S100, the tin salt solution may be, fo...

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Abstract

The invention provides a preparation method of a stannic oxide-based gas sensitive element and a carbon monoxide gas sensor system. The preparation method comprises the following steps in sequence: uniformly stirring a saline solution of tin at a preset temperature; adding weak base according to a preset speed in the stirring process until the pH value of the solution is adjusted to be acid, continuously stirring until a gel state is achieved; drying gel, grinding and sintering to obtain stannic oxide powder; adding metal salt and volatilizable alcohol solvent into the stannic oxide powder, and carrying ball milling to obtain metal-doped stannic oxide-based gas sensitive slurry; and applying the metal-doped stannic oxide-based gas sensitive slurry to the electrode area of a sensor substrate, and sintering to obtain the stannic oxide gas sensitive element. According to the preparation method, the technical problem of high work temperature of a SnO2 gas sensitive element can be fundamentally solved by changing the preparation process of the stannic oxide-based gas sensitive element.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a preparation method of a tin dioxide-based gas sensor and a carbon monoxide gas sensor system. Background technique [0002] At present, the gas sensors used to detect carbon monoxide are mostly electrochemical or semiconductor sensors. However, electrochemical sensors generally have the problem of being too large, and may cause poisoning and permanent damage due to long-term continuous exposure, so their lifespan is not long. Among the semiconductor sensors, the technology is relatively mature and the most used semiconductor gas sensor is generally a metal oxide semiconductor gas sensor. It has high sensitivity, long life, can withstand high concentration of hydrogen sulfide exposure, and it can recover quickly without damage to its function. advantage. However, the metal oxide semiconductor gas sensor has the disadvantage of high power consumption. Generally speaking, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 孙旭辉吴庆乐徐瑞张书敏张永超蔡晓娟张平平顾元斌
Owner 江苏智闻智能传感科技有限公司
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