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a kind of wo 3 Preparation of Nanoflower Materials and Its Application in Gas Sensors

A technology of nanomaterials and nanoflowers, applied in the fields of analysis of materials, material resistance, nanotechnology, etc., can solve problems such as high prices, and achieve the effects of good reversibility, good selectivity, and high porosity

Active Publication Date: 2020-05-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prepare WO in existing 3 In many studies on nanomaterials, sodium tungstate, ammonium metatungstate, tungstic acid, tungsten hexachloride and other analytically pure reagents or extremely high-purity tungsten metal are often used as tungsten sources. These reagents are expensive and have certain pollution. sex

Method used

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  • a kind of wo <sub>3</sub> Preparation of Nanoflower Materials and Its Application in Gas Sensors
  • a kind of wo <sub>3</sub> Preparation of Nanoflower Materials and Its Application in Gas Sensors
  • a kind of wo <sub>3</sub> Preparation of Nanoflower Materials and Its Application in Gas Sensors

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Embodiment 1

[0037] The invention is a kind of WO which is self-assembled by nanosheets synthesized by using scheelite concentrate. 3 The method of nanoflower and its function in NO 2 Application of gas sensor. The X-ray diffraction pattern of the scheelite concentrate that the present invention adopts is as figure 1 As shown, the results show that the main useful mineral in the scheelite concentrate is CaWO 4 .

[0038] A gas-sensitive coating is WO self-assembled from nanosheets 3 The gas sensor of nanoflowers, the schematic diagram of its structure is as follows figure 2 As shown, the Ni-Cr heating wire 2 traverses the Al 2 o 3 The ceramic tube 1 is welded on the heating electrode of the hexagonal base, and the gold electrode 3 is coated on Al 2 o 3 The outer surface of the ceramic tube 1 is welded to the measuring electrode of the hexagonal base through four platinum wires 4 , and the gas-sensitive coating 5 is coated on the gold electrode 3 and the outer surface of the cerami...

Embodiment 2

[0055] A gas-sensitive coating is WO self-assembled from nanosheets 3 The gas sensor of nanoflowers, the schematic diagram of its structure is as follows figure 2 shown.

[0056] A kind of WO synthesized by self-assembly of nanosheets from scheelite concentrate 3 Preparation method of nanoflowers and NO 2 Gas sensor, follow the steps below:

[0057] ①Use the sodium hydroxide leaching process to extract tungsten from scheelite concentrate: place scheelite concentrate in a NaOH solution with a concentration of 15mol / L, at a liquid-solid ratio of 2:1, a reaction temperature of 170°C, and a stirring speed of 600rpm , holding time of 180min under the experimental conditions, filter the obtained leaching product to obtain filtrate and leaching residue, wash the leaching residue with deionized water 3 times to obtain washing liquid, and mix the obtained filtrate and the obtained washing liquid to obtain tungsten-containing The leachate of acid radical ions, the concentration of W ...

Embodiment 3

[0065] A gas-sensitive coating is WO self-assembled from nanosheets 3 The gas sensor of nanoflowers, the schematic diagram of its structure is as follows figure 2 shown.

[0066] A kind of WO synthesized by self-assembly of nanosheets from scheelite concentrate 3 Preparation method of nanoflowers and NO 2 Gas sensor, follow the steps below:

[0067] ①Extract tungsten from scheelite concentrate by using sodium hydroxide leaching process: place scheelite concentrate in NaOH solution with a concentration of 18mol / L, at a liquid-solid ratio of 3:1, a reaction temperature of 190°C, and a stirring speed of 700rpm , holding time of 30min under the experimental conditions, the obtained leaching product was filtered to obtain the filtrate and leaching residue, the leaching residue was washed 3 times with deionized water to obtain the washing liquid, and the obtained filtrate and the obtained washing liquid were mixed to obtain a tungsten-containing The leachate of acid radical ion...

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Abstract

The present invention provides a WO 3 Preparation of nanoflower materials and their application in gas sensors. The NaOH leaching process is used to extract tungsten from the scheelite concentrate to obtain a tungsten-containing leach solution; the leach solution is added to the HCl solution to form a tungstic acid precipitate, and the washed tungsten acid is added to deionized water and H 2 O 2 Dissolve; use HCl solution to adjust the pH value of the mixed solution to 1.2~1.8, and react at a constant temperature of 100~180°C for 4~16 hours to obtain WO self-assembled from nanosheets 3 Nanoflower, the diameter of the nanoflower is 300-420nm, the thickness is 100-140nm, the length of the nanosheet is 170-390nm, the width is 120-140nm, the thickness is 30-50nm, and it has a hexagonal phase crystal structure. Put this WO 3 The nanoflowers are coated on the gold electrode on the outer surface of the ceramic tube, and then undergo aging treatment to prepare a gas sensor. Preparation of NO based on the method of the present invention 2 Gas sensor can detect low concentration, even ppb level NO 2 High selectivity of gases, fast response at low operating temperatures.

Description

technical field [0001] The invention relates to the technical field of gas sensors of semiconductor oxides, in particular to a WO 3 Nanoflower approach and its application in gas sensors. Background technique [0002] With the rapid development of science and technology and the acceleration of industrialization in China, more and more flammable, explosive or toxic The gas is discharged into the air, causing serious environmental pollution, and may even cause fires, explosions, etc., seriously threatening human health and safety. Among them, nitrogen dioxide (NO 2 ) is a common highly toxic gas with a pungent smell, which mainly comes from the high-temperature combustion of some fossil fuels and emissions from motor vehicles. It is not only the main cause of acid rain, but also can lead to a series of environmental problems such as ozone layer thinning, land acidification, and surface water eutrophication. At the same time, NO 2 It will also damage the human respiratory ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02G01N27/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G41/02C01P2002/72C01P2004/03G01N27/127
Inventor 沈岩柏李停停卢瑞赵思凯李国栋高淑玲刘文刚魏德洲
Owner NORTHEASTERN UNIV LIAONING
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