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Tungsten trioxide gas-sensitive film material, tungsten trioxide-based composite gas-sensitive film material, and preparation methods and applications of tungsten trioxide gas-sensitive film material and tungsten trioxide-based composite gas-sensitive film material

A technology of tungsten trioxide and gas-sensitive film, which is applied in the direction of analyzing materials, material resistance, and material analysis through electromagnetic means, can solve the problems of reducing the effective contact area of ​​gas, avoid nanostructure damage, and improve gas-sensitive response Effect

Inactive Publication Date: 2019-11-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that from the nano powder to the gas-sensitive membrane material on the electrode involves the secondary processing of the powder, and the grinding and other processes in the slurry production process may destroy the nanostructure, and the membrane obtained by coating The material is generally thick (greater than 10 microns), and the accumulation between nanoparticles will reduce the effective contact area with the gas

Method used

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  • Tungsten trioxide gas-sensitive film material, tungsten trioxide-based composite gas-sensitive film material, and preparation methods and applications of tungsten trioxide gas-sensitive film material and tungsten trioxide-based composite gas-sensitive film material
  • Tungsten trioxide gas-sensitive film material, tungsten trioxide-based composite gas-sensitive film material, and preparation methods and applications of tungsten trioxide gas-sensitive film material and tungsten trioxide-based composite gas-sensitive film material
  • Tungsten trioxide gas-sensitive film material, tungsten trioxide-based composite gas-sensitive film material, and preparation methods and applications of tungsten trioxide gas-sensitive film material and tungsten trioxide-based composite gas-sensitive film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Preparation of nanostructure WO by chemical bath method 3 film

[0032] (1) Dissolve a certain amount of sodium tungstate and citric acid in deionized water according to the mass ratio of 1:2;

[0033] (2) Stir the above solution at room temperature for 0.5 hours, then add 6 mL of dilute hydrochloric acid solution with a concentration of 3 mol / L, and continue stirring at room temperature for 0.5 hours to obtain a clear precursor solution;

[0034] (3) Immerse the cleaned ceramic substrate printed with electrodes into WO 3 Precursor solution, and place it in a water bath at 60°C for 2 hours;

[0035] (4) After the heat preservation is completed, the ceramic substrate is taken out, cleaned and dried, and heat-treated at 400° C. for 10 hours.

[0036] The nanostructure WO prepared in embodiment 1 3 The scanning electron microscope image of the thin film is shown in figure 1 As shown, the prepared nano-WO 3 The film is composed of nanosheets with a thick...

Embodiment 2

[0037] Embodiment 2: Preparation of nanostructure WO by chemical bath method 3 film

[0038] (1) Weigh a certain amount of sodium tungstate and ammonium oxalate and dissolve them in deionized water according to the mass ratio of 5:1;

[0039] (2) Stir the above solution at room temperature for 0.5 hours, then add 10 mL of dilute hydrochloric acid solution with a concentration of 3 mol / L, and continue stirring at room temperature for 0.5 hours to obtain a clear precursor solution;

[0040] (3) Immerse the cleaned ceramic substrate printed with electrodes into WO 3 Precursor solution, and place it in a hydrothermal reaction kettle at 120°C for 2 hours;

[0041] (4) After the heat preservation is completed, the ceramic substrate is taken out, washed and dried, and heat-treated at 350° C. for 20 hours.

[0042] like figure 2 As shown, the prepared nano-WO 3 The film is composed of nano-sheets with a thickness of about 100-200nm, and the nano-sheets grow vertically to form a ...

Embodiment 3

[0043] Embodiment 3: Preparation of nanostructure WO by chemical bath method 3 film

[0044] (1) Weigh a certain amount of sodium tungstate, ammonium oxalate, and ammonium sulfate according to the mass ratio of 6:4:1 and dissolve them in deionized water;

[0045] (2) Stir the above solution at room temperature for 0.5 hours, then add 8 mL of dilute hydrochloric acid solution with a concentration of 3 mol / L, and continue stirring at room temperature for 0.5 hours to obtain a clear precursor solution;

[0046] (3) Immerse the cleaned ceramic substrate printed with electrodes into WO 3 precursor solution, and place it in a water bath at 80°C for 0.5 hours;

[0047] (4) After the heat preservation is completed, the ceramic substrate is taken out, washed and dried, and heat-treated at 300° C. for 48 hours.

[0048] like image 3 As shown, the prepared nano-WO 3 The film is composed of nano-sheets with a thickness of about 50-100nm, and the nano-sheets grow vertically to form a...

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Abstract

The invention discloses a tungsten trioxide gas-sensitive film material, a tungsten trioxide-based composite gas-sensitive film material, and preparation methods and applications of the tungsten trioxide gas-sensitive film material and the tungsten trioxide-based composite gas-sensitive film material, wherein a tungsten trioxide thin gas-sensitive material with a nanometer structure is directly prepared on an electrode substrate through in-situ solution deposition, and second phase oxide compounding is performed at the prepared tungsten trioxide thin film through a sol-gel method to obtain a tungsten trioxide-based composite gas-sensitive film material. According to the present invention, the tungsten trioxide film with the nanometer structure can be subjected to direct deposition growth on the electrode substrate; the prepared nanometer structure tungsten trioxide thin film and the composite thin film based on the nanometer structure tungsten trioxide have the network-like structure formed by the nano-sheets growing perpendicular to the substrate; the method has advantages of high efficiency, low cost and simple process, and is suitable for industrial production; and the obtainednanometer structure tungsten trioxide film has a large specific surface area, can effectively overcome the agglomeration problem among nanoparticles, has good gas-sensitive response to gases such as NO2, H2S and the like, and has excellent gas-sensitive application prospect.

Description

technical field [0001] The invention relates to the field of metal oxide film material preparation, in particular to a tungsten trioxide gas-sensitive film material, a tungsten trioxide-based composite gas-sensitive film material, a preparation method and an application. Background technique [0002] With the development of social economy and the improvement of people's living standards, people put forward more and more requirements for the environment they live in, especially the air quality. The detection of low-concentration flammable, explosive and toxic gases indoors and outdoors It is also getting more and more attention. A gas sensor is a sensor that detects a specific gas. It uses the physical and chemical reaction between the gas to be measured and the sensitive material to convert the concentration and composition of the gas to be measured into an electrical signal output, and confirm the gas composition and concentration according to the change of the electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89G01N27/12
CPCC04B41/009C04B41/5027C04B41/52C04B41/89G01N27/127C04B35/00C04B41/455C04B41/5035
Inventor 王明松王宜炜葛传鑫李晓静刘桂武乔冠军
Owner JIANGSU UNIV
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