Preparation method of novel titanium-doped tungsten oxide-based methylbenzene steam detection sensor

A technology of tungsten oxide-based toluene and detection sensors, applied in tungsten oxide/tungsten hydroxide, instruments, measuring devices, etc., can solve the problems of high cost, lack of toluene gas sensor, complex process, etc., and achieve short recovery time, increase Atmospheric sensitivity characteristics, the effect of simple manufacturing process

Inactive Publication Date: 2018-03-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main preparation method of domestic gas sensors is mostly sputtering method, the process is complicated, the cost is high, and there is a lack of highly selective gas sensors sensitive to toluene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Ammonium tungstate and cetyltrimethylammonium bromide are dissolved in deionized water according to the molar ratio of 4:1, and the concentration range of the ammonium tungstate solution is 0.01mol / L;

[0025] (2) 38% concentrated hydrochloric acid is dropped into the ammonium tungstate solution, the molar ratio of hydrochloric acid to ammonium tungstate is 10:1, and the stirring is continued during the dropping process to obtain tungstate hydrosol;

[0026] (3) Take quantitative absolute ethanol and glacial acetic acid at a volume ratio of 10:1, and mix them uniformly; take quantitative butyl titanate and add it to the mixed solution at a volume ratio of 1:5 to the mixed solution, and stir for 30 minutes to obtain a yellow solution , recorded as solution A; according to the volume ratio of 2:3, measure quantitative deionized water and absolute ethanol respectively, mix well, and record as solution B; according to the volume ratio of solution B and solution A of 4:6,...

Embodiment 2

[0033] (1) Ammonium tungstate and cetyltrimethylammonium bromide are dissolved in deionized water according to the molar ratio of 4.5:1, and the concentration range of the ammonium tungstate solution is 0.015mol / L;

[0034] (2) 38% concentrated hydrochloric acid is dropped into the ammonium tungstate solution, the molar ratio of hydrochloric acid to ammonium tungstate is 10:1, and the stirring is continued during the dropping process to obtain tungstate hydrosol;

[0035] (3) Take quantitative absolute ethanol and glacial acetic acid at a volume ratio of 8:1, and mix them evenly; take quantitative butyl titanate and add them to the mixed solution at a volume ratio of 1:5.5 to the mixed solution, and stir for 30 minutes to obtain a yellow solution , recorded as solution A; according to the volume ratio of 2:3.5, measure quantitative deionized water and absolute ethanol respectively, mix well, and record as solution B; according to the volume ratio of solution B and solution A of...

Embodiment 3

[0042] (1) Ammonium tungstate and cetyltrimethylammonium bromide are dissolved in deionized water according to the molar ratio of 5:1, and the concentration range of the ammonium tungstate solution is 0.02mol / L;

[0043] (2) 38% concentrated hydrochloric acid is dropped into the ammonium tungstate solution, the molar ratio of hydrochloric acid to ammonium tungstate is 10:1, and the stirring is continued during the dropping process to obtain tungstate hydrosol;

[0044] (3) Take quantitative absolute ethanol and glacial acetic acid at a volume ratio of 5:1, and mix them uniformly; take quantitative butyl titanate and add it to the mixed solution at a volume ratio of 1:6 to the mixed solution, and stir for 30 minutes to obtain a yellow solution , recorded as solution A; according to the volume ratio of 2:4, measure quantitative deionized water and absolute ethanol respectively, mix well, and record as solution B; according to the volume ratio of solution B and solution A of 4:5, ...

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Abstract

The invention relates to a preparation method of a novel titanium-doped tungsten oxide-based methylbenzene steam detection sensor and is suitable for the field of preparation of a gas sensor with methylbenzene steam with a high selective characteristic. The preparation method comprises the following steps: by adopting a sol-gel method, adding hexadecyl trimethyl ammonium bromide in a sol process;then drying and grinding a colloid, cleaning the colloid and carrying out annealing at high temperature; coating a ceramic tube with the prepared powder material through hexadecyl trimethyl ammonium bromide; and carrying out secondary annealing to prepare a gas sensitive sensor; and then carrying out aging. In the colloid preparation process, hexadecyl trimethyl ammonium bromide is added to be beneficial to generation of a stable colloid favorably; during coating, hexadecyl trimethyl ammonium bromide is added, so that the specific surface area of the material is increased, and in the apparatuspreparation process, the molar ratio of titanium to tungsten is controlled to be 1:5 to 1:9, so that the sensitivity and selectivity of the gas sensitive element are improved. The gas sensitive element prepared by the method has a sensitive characteristic on methylbenzene steam, and can detect the methylbenzene steam from much organic steam.

Description

technical field [0001] The invention belongs to a gas sensing element, in particular to a preparation method of a high-selectivity toluene vapor gas sensing element doped with titanium tungsten trioxide material. Background technique [0002] Sensors have important applications in modern industry and agriculture, information technology, environmental monitoring and other fields. As an important branch of sensors, metal oxide gas sensors have become the focus of sensor research and development in recent years, and are one of the development directions of gas sensors in the future. This kind of sensor is mainly an electronic device made of the principle that the surface resistance of the metal oxide semiconductor changes when it encounters the measured gas, and its selectivity and sensitivity characteristics are very good. [0003] Toluene is an important chemical raw material and organic solvent. It is a colorless, volatile liquid with a special aromatic smell. Toluene in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C01G41/02
CPCG01N27/12C01G41/02C01P2004/82G01N27/125
Inventor 潘国峰缪玉欣何平高宝红
Owner HEBEI UNIV OF TECH
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