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Preparation method of methylbenzene sensitive element

A technology of sensitive components and gas sensitive components, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of reduced sensitivity and weak sensitivity, so as to maintain reliability and stability, overcome fatigue phenomenon, gas sensitive strong effect

Inactive Publication Date: 2014-05-14
XIAN JIAOTONG UNIV JINGSHENG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of its detection, carbon nanotubes or metal oxides are generally used as the sensing unit, which can only detect toluene with a certain concentration. The sensitivity is not strong, and the sensitivity is easy to further decrease with time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A preparation method for a toluene sensitive element, comprising the steps of:

[0014] Step 1, the SnCl 4 ·5H 2 O was dissolved in water, citric acid was added as a dispersant, and then titrated with dilute ammonia water to a pH value of 3 to obtain a sol, which was then calcined at 450°C for 2 hours to obtain SnO 2 matrix;

[0015] Step 2, take CuO, WO 3 and the prepared SnO 2 , mixed evenly according to the mass ratio of 4:1:100, ground and then calcined at 500°C for 2h, and then lowered to room temperature;

[0016] Step 3: Grinding the material cooled to room temperature into a slurry, coating it on a ceramic tube, and sintering at 650° C. for 2 hours to prepare a gas sensor.

Embodiment 2

[0018] A preparation method for a toluene sensitive element, comprising the steps of:

[0019] Step 1, the SnCl 4 ·5H 2 O was dissolved in water, citric acid was added as a dispersant, and then titrated with dilute ammonia water to a pH value of 3 to obtain a sol, which was then calcined at 550°C for 2 hours to obtain SnO 2 matrix;

[0020] Step 2, take CuO, WO 3 and the prepared SnO 2 , mixed evenly according to the mass ratio of 5:1:100, ground and then calcined at 500°C for 2h, and then lowered to room temperature;

[0021] Step 3: Grinding the material cooled to room temperature into a slurry, coating it on a ceramic tube, and sintering at 600° C. for 2 hours to prepare a gas sensor.

Embodiment 3

[0023] A preparation method for a toluene sensitive element, comprising the steps of:

[0024] Step 1, the SnCl 4 ·5H 2 Dissolve O in water, add a dispersant, and then titrate with dilute ammonia water to a pH value of 3 to obtain a sol, which is then calcined at 500°C for 2 hours to obtain SnO 2 matrix;

[0025] Step 2, take CuO, WO 3 and the prepared SnO 2 , mixed evenly according to the mass ratio of 5:0.5:100, ground and then calcined at 500°C for 2h, and then cooled to room temperature;

[0026] Step 3: Grinding the material cooled to room temperature into a slurry, coating it on a ceramic tube, and sintering at 600° C. for 2 hours to prepare a gas sensor.

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PUM

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Abstract

The invention relates to a preparation method of a methylbenzene sensitive element, which comprises the following steps: firstly, dissolving SnCl4.5H2O in water, adding a dispersant, titrating with weak aqua ammonia until the pH value is 3 to obtain a sol, drying and calcining to obtain a SnO2 matrix; and secondly, uniformly mixing CuO, WO3 and the prepared SnO2, grinding, calcining, cooling to room temperature, grinding into slurry, spreading the slurry on a ceramic tube, and sintering to obtain the gas sensitive element. By using the CuO / WO3-doped SnO2 as the matrix, the methylbenzene sensitive element has high gas sensitivity, can overcome the fatigue phenomenon, and can keep the reliability and stability of long-term operation.

Description

technical field [0001] The invention relates to the technical field of toluene detection, in particular to a preparation method of a toluene sensitive element. Background technique [0002] Toluene has serious harm to the environment and can cause pollution to the air, water environment and water sources. Therefore, the detection of toluene is very important. In the process of its detection, carbon nanotubes or metal oxides are generally used as the sensing unit, which can only detect toluene with a certain concentration. The sensitivity is not strong, and the sensitivity is easy to further decrease with time. Contents of the invention [0003] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for preparing a toluene sensitive element, the process is simple and reliable, and the process conditions are controllable. [0004] In order to achieve the above object, the technical scheme adopted i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 田边
Owner XIAN JIAOTONG UNIV JINGSHENG SCI & TECH DEV
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