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Preparation of WO3 (tungsten trioxide) nanoflower material and application of WO3 nanoflower material in gas sensor

A nanomaterial, nanoflower technology, applied in nanotechnology, nanotechnology, analytical materials, etc., can solve problems such as high price, and achieve the effects of good reversibility, good reversibility and selectivity, and high porosity

Active Publication Date: 2019-09-20
NORTHEASTERN UNIV
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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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  • Preparation of WO3 (tungsten trioxide) nanoflower material and application of WO3 nanoflower material in gas sensor
  • Preparation of WO3 (tungsten trioxide) nanoflower material and application of WO3 nanoflower material in gas sensor
  • Preparation of WO3 (tungsten trioxide) nanoflower material and application of WO3 nanoflower material in gas sensor

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Effect test

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] ①Extract tungsten from scheelite concentrate by using sodium hydroxide leaching process: 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 in...

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 is filtered to obtain the filtrate and leaching residue, the leaching residue is washed with deionized water 3 times to obtain the washing liquid, and the obtained filtrate and the obtained washing liquid are mixed to obtain a tungsten-containing The leachate of acid radical ions, ...

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Abstract

The invention provides preparation of a WO3 (tungsten trioxide) nanoflower material and application of the WO3 nanoflower material in a gas sensor. A preparation method of the WO3 nanoflower material includes: adopting a NaOH leaching process to extract tungsten from scheelite so as to obtain tungstenic leach liquor; adding the leach liquor into an HCI (hydrogen chloride) solution to form a tungstic acid precipitate, and dissolving washed tungstic acid by adding deionized water and H2O2; adjusting pH of a mixed solution to 1.2-1.8 by the HCI solution, and reacting for 4-16 hours at a constant temperature in a range of 100-180 DEG C to obtain a WO3 nanoflower assembled from nanosheets automatically. The WO3 nanoflower is 300-420 nanometers in diameter and 100-140 nanometers in thickness. Each of the nanosheets is 170-390 nanometers in length, is 120-140 nanometers in width, is 30-50 nanometers in thickness and is provided with a hexagonal structure. The gas sensor is prepared by coating the WO3 nanoflower on a gold electrode on an outer surface of a ceramic tube and aging. By preparing a NO2 gas sensor on the basis of the preparation method of the WO3 nanoflower material, quick responses to high selectivity and low working temperature of low-concentration and even ppb-level (part per billion-level) NO2 gas can be realized.

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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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
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