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

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Problems solved by technology

Prepare WO in existing 3 In many studies on nanomaterials, sodium tungstate, ammonium metatungstate, tungstic acid, tungsten hexachloride and other analyti

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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Example Embodiment

[0036] Example 1

[0037] The present invention is a WO made of self-assembled nano-sheets synthesized from scheelite concentrate 3 Nanoflower method and its application in NO 2 Application of gas sensor. The X-ray diffraction pattern of the scheelite concentrate used in the present invention is as follows figure 1 As shown, the results show that the main useful mineral in the scheelite concentrate is CaWO 4 .

[0038] One kind of gas-sensitive coating is WO made by self-assembly of nanosheets 3 The structure diagram of the nanoflower gas sensor is as figure 2 As shown, where Ni-Cr heating wire 2 crosses 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 with Al 2 O 3 The outer surface of the ceramic tube 1 is welded to the measuring electrode of the hexagonal base through 4 platinum wires 4, and the gas-sensitive coating 5 is coated on the outer surface of the gold electrode 3 and the ceramic tube 1. The compos...

Example Embodiment

[0054] Example 2

[0055] One kind of gas-sensitive coating is WO made by self-assembly of nanosheets 3 The structure diagram of the nanoflower gas sensor is as figure 2 Shown.

[0056] A WO made of self-assembled nano-sheets synthesized from scheelite concentrate 3 Nano flower preparation method and NO 2 Gas sensor, follow the steps below:

[0057] ①Using sodium hydroxide leaching process to extract tungsten from scheelite concentrate: place the scheelite concentrate in a NaOH solution with a concentration of 15mol / L, at a liquid-solid ratio of 2:1, reaction temperature 170℃, stirring speed 600rpm , Leaching under the experimental conditions with a holding time of 180min, filtering the obtained leaching product to obtain filtrate and leaching residue, washing the leaching residue with deionized water three times to obtain a washing solution, mixing the obtained filtrate and the obtained washing solution to contain tungsten A leaching solution of acid radical ions, where the concen...

Example Embodiment

[0064] Example 3

[0065] One kind of gas-sensitive coating is WO made by self-assembly of nanosheets 3 The structure diagram of the nanoflower gas sensor is as figure 2 Shown.

[0066] A WO made of self-assembled nano-sheets synthesized from scheelite concentrate 3 Nano flower preparation method and NO 2 Gas sensor, follow the steps below:

[0067] ①Using sodium hydroxide leaching process to extract tungsten from scheelite concentrate: place the scheelite concentrate in a NaOH solution with a concentration of 18mol / L, at a liquid-solid ratio of 3:1, reaction temperature 190℃, stirring speed 700rpm , Leaching under the experimental conditions of holding time 30min, filtering the obtained leaching product to obtain filtrate and leaching residue, washing the leaching residue with deionized water 3 times to obtain washing liquid, mixing the obtained filtrate and the obtained washing liquid to contain tungsten The leaching solution of acid radical ions, the concentration of W in the le...

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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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