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Application of copper tungstate and preparation method of copper tungstate gas sensor

A gas sensor and gas sensing technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., to achieve good selectivity, simple preparation process, and short response time

Inactive Publication Date: 2012-08-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of copper tungstate as a gas sensor to detect ethanol gas has not been reported at home and abroad

Method used

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  • Application of copper tungstate and preparation method of copper tungstate gas sensor
  • Application of copper tungstate and preparation method of copper tungstate gas sensor
  • Application of copper tungstate and preparation method of copper tungstate gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] CuWO 4 The preparation method of gas sensor comprises the steps:

[0056] (1) CuWO 4 Gas-sensitive material preparation: first weigh 0.01mol copper sulfate (CuSO 4 ·5H 2 O) Add to 50ml deionized water and ultrasonically dissolve it for 10 minutes, weigh 0.01mol sodium tungstate (Na 2 WO 4 2H 2 O) Add it to 50ml deionized water and ultrasonically dissolve it for 10 minutes; then mix the above-mentioned copper salt solution and tungsten salt solution to obtain a mixed solution, and control the molar ratio of copper to tungsten to be 1:1; secondly, place the mixed solution at 60° C. React under the same conditions for 6 hours; after the reaction is completed, cool to room temperature, wash the product repeatedly with deionized water 3 times, and dry at 80°C for 6 hours to obtain the precursor; finally, roast the precursor at 600°C for 6h to obtain 300-800nm ​​CuWO 4 powder.

[0057] (2) the CuWO described in step (2) 4 The powder is fully mixed with the terpineol s...

Embodiment 2

[0064] CuWO 4 The preparation method of gas sensor comprises the steps:

[0065] (1) CuWO 4 Gas-sensitive material preparation: first weigh 0.01mol copper sulfate (CuSO 4 ·5H 2 O) Add to 50ml deionized water and ultrasonically dissolve it for 10 minutes, weigh 0.01mol sodium tungstate (Na 2 WO 4 2H 2 O) Add it to 50ml deionized water and ultrasonically dissolve it for 10 minutes; then mix the above-mentioned copper solution and tungsten solution to obtain a mixed solution, and control the molar ratio of copper to tungsten to be 1:1; secondly, put the mixed solution at 60°C React for 12 hours; after the reaction is completed, cool to room temperature, wash the product repeatedly with deionized water three times, and dry at 80°C for 6 hours to obtain the precursor; finally, roast the precursor at 400°C for 12 hours to obtain 40-120nm CuWO 4 gas sensitive material.

[0066] (2) the CuWO described in step (2) 4 The material is fully mixed with the terpineol solution of met...

Embodiment 3

[0071] CuWO 4 The preparation method of gas sensor comprises the steps:

[0072] (1) CuWO 4 Gas-sensitive material preparation: first weigh 0.01mol copper sulfate (CuSO 4 ·5H2 O) Add to 50ml deionized water and ultrasonically dissolve it for 10 minutes, weigh 0.01mol sodium tungstate (Na 2 WO 4 2H 2 O) Add it to 50ml deionized water and ultrasonically dissolve it for 10 minutes; then mix the above-mentioned copper solution and tungsten solution to obtain a mixed solution, and control the molar ratio of copper to tungsten to be 1:1; secondly, put the mixed solution at 60°C React for 1 hour; after the reaction is completed, cool to room temperature, wash the product repeatedly with deionized water 3 times, and dry at 80°C for 6 hours to obtain the precursor; finally, the precursor is roasted at 800°C for 1 hour to obtain 2-3 μm CuWO 4 gas sensitive material.

[0073] (2) the CuWO described in step (2) 4 The material is fully mixed with the terpineol solution of methyl cel...

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Abstract

The invention provides an application of copper tungstate as an ethanol gas sensing element and a preparation method of a copper tungstate gas sensor, belonging to the technical field of preparation of gas sensitive materials and gas sensors. The preparation method comprises the following steps of: mixing copper solution and tungsten solution based on the same molar ratio of the copper to the tungsten, and reacting, after reacting, cooling, washing with deionized water, drying and roasting to obtain CuWO4 powder; fully mixing and grinding the CuWO4 powder with an adhesive to prepare slurry, evenly coating the slurry on the outer surface of an Al2O3 ceramic tube, and annealing for 2-4h at 400 DEG C to prepare a gas sensitive electrode tube; and finally welding, electrically ageing and packaging the gas sensitive electrode tube according to a traditional heater-type process to prepare a CuWO4 gas sensor. The CuWO4 gas sensor prepared by the invention has the advantages of high sensitivity to ethanol, short response time, favorable selectivity and relatively low working temperature, is simple and easy to prepare by only using conventional containers and devices, and is suitable for industrial production.

Description

technical field [0001] The invention discloses the application of copper tungstate and a preparation method of a copper tungstate gas sensor, and belongs to the technical field of gas sensitive materials and gas sensor preparation. technical background [0002] The most commonly used gas-sensing materials for traditional metal oxide gas sensors are SnO 2 , ZnO and TiO 2 etc., but they have defects such as high operating temperature (350-450°C), high energy consumption, and poor selectivity. Especially for VOCs, due to their similar constituent elements and molecular structures, there is a lack of selectivity for different VOCs, which is one of the key issues currently limiting the widespread use of metal oxide gas sensors (Zeng Wen, Liu Tian-mo, Gas-sensing properties of SnO 2 -TiO 2 -based sensor for volatile organic compound gas and its sensing mechanism, Physica B, 2010, 405, 1345-1348). In addition, metal oxide gas sensors usually have a long response and recovery t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C01G41/00
Inventor 肖奇王涛
Owner CENT SOUTH UNIV
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