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Preparation method and application of a noble metal-doped Wo3-based formaldehyde gas-sensitive material

A precious metal, formaldehyde gas technology, applied in the direction of material electrochemical variables, tungsten oxide/tungsten hydroxide, etc., can solve the problems of slow response and recovery speed, poor selectivity of formaldehyde gas sensor, etc., to promote the conversion rate and speed up the response and recovery speed. , improve the effect of the reaction

Active Publication Date: 2019-09-27
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is: to provide a kind of precious metal doped WO 3 The preparation method and application of base formaldehyde gas sensitive materials, in order to solve the problems of poor selectivity, slow response and recovery speed of existing formaldehyde gas sensors

Method used

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  • Preparation method and application of a noble metal-doped Wo3-based formaldehyde gas-sensitive material
  • Preparation method and application of a noble metal-doped Wo3-based formaldehyde gas-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 6.6g of sodium tungstate and dissolve in 100ml of deionized water, stir magnetically for 30min to form a uniform solution, then add 3mol / L hydrochloric acid dropwise to adjust the pH of the solution to 1, and continue stirring for 30min to form a light yellow liquid. Then add 30ml of 0.17mol / L CTAB solution, stir evenly and transfer to a reaction kettle with a 200ml polytetrafluoroethylene liner to make the volume filling rate 75%. The reaction kettle was kept in an oven at 180°C for 24 hours and then cooled to room temperature. After washing with water and alcohol three times, the precipitated product was dried in an oven at 60°C for 12 hours. After drying, the product was sintered in a muffle furnace at 450 °C for 2 h. Such as figure 1 The electron microscope image shown.

[0029] Get 2g of samples and ultrasonically disperse them in 20ml of absolute ethanol, add dropwise a chloroplatinic acid solution with a concentration of 0.039mol / L according to the molar ...

Embodiment 2

[0033]Weigh 1.65g of sodium tungstate and dissolve in 100ml of deionized water, stir magnetically for 30min to form a uniform solution, then add 3mol / L hydrochloric acid dropwise to adjust the pH of the solution to 1, and continue stirring for 30min to form a light yellow liquid. Then add 30ml of 0.042mol / L CTAB solution, stir evenly and transfer to a reaction kettle with 200ml polytetrafluoroethylene liner to make the volume filling rate 75%. The reaction kettle was kept in an oven at 120°C for 16 hours and then cooled to room temperature. The precipitated product was washed with water and alcohol three times, and then dried in an oven at 60°C for 12 hours. After drying, the product was sintered in a muffle furnace at 550 °C for 2 h.

[0034] Get 2g of sample and ultrasonically disperse it in 20ml of absolute ethanol, add dropwise a chloroplatinic acid solution with a concentration of 0.039mol / L according to the molar ratio Pt:W of 1%, adjust its pH value to 9 with ammonia wa...

Embodiment 3

[0036] Weigh 16.5g of sodium tungstate and dissolve in 100ml of deionized water, stir magnetically for 30min to form a uniform solution, then add 2mol / L hydrochloric acid dropwise to adjust the pH of the solution to 0.5, and continue stirring for 30min to form a light yellow liquid. Then add 30ml of 0.42mol / L CTAB solution, stir evenly and transfer to the reaction kettle with 200ml polytetrafluoroethylene liner to make the volume filling rate 75%. The reaction kettle was kept in an oven at 200°C for 18 hours and then cooled to room temperature. After washing with water and alcohol three times, the precipitated product was dried in an oven at 60°C for 12 hours. After drying, the product was sintered in a muffle furnace at 600 °C for 2 h.

[0037] Take 2g of sample and ultrasonically disperse it in 20ml of distilled water, add dropwise chloropalladium acid solution at a molar ratio of Pd:W of 2%, adjust its pH value to 9 with ammonia water, continue to stir for 2h, and then plac...

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Abstract

The invention belongs to the field of semiconductor oxide gas sensors and relates to a precious metal doped WO 3 Preparation method and application of formaldehyde-based gas-sensitive materials. The formaldehyde gas-sensitive material of the present invention is composed of sheet-like WO with a monoclinic structure 3 Through noble metal doping, the response recovery speed to formaldehyde is improved and the operating temperature is reduced. The preparation method is to obtain hexagonal sheet WO through hydrothermal synthesis under the auxiliary condition of surfactant. 3 Particles have a relatively large specific surface area and a sheet-like structure that is conducive to the transmission of gas to be detected. The high response recovery speed, low operating temperature, and high sensitivity of formaldehyde gas-sensitive materials doped with precious metals are achieved through the impregnation method, and the formaldehyde gas sensor is obtained by subjecting the material to paint aging.

Description

technical field [0001] The invention belongs to the field of semiconductor oxide gas sensor, in particular to precious metal doped flake WO 3 Preparation method and application of formaldehyde gas sensitive material with high sensitivity, low working temperature and high response recovery speed. Background technique [0002] Formaldehyde, as the main source of indoor air pollution, has been identified as a carcinogen by the World Health Organization. For the accurate monitoring of formaldehyde gas, the preparation of a formaldehyde gas-sensing material with high sensitivity, low working temperature, fast response and recovery speed and good selectivity has attracted much attention. Au-In as prepared by Zhang et al. 2 o 3 The sensitivity of nanoblocks to 100ppm formaldehyde at 240 °C is about 37 (Zhang, S., et al. Facile approach to prepare hierarchical Au-loaded In 2 o 3 Porous nanocubes and their enhanced sensing performance towards formaldehyde, Sensors and Actuators ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26C01G41/02
Inventor 于慧敏李建中
Owner NORTHEASTERN UNIV LIAONING
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