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A self-assembled wo of nanorods 3 micron shuttle nh 3 Gas sensor and its preparation method

A gas sensor and nanorod technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high price, achieve low price, short response/recovery time, reversibility and selective effect

Active Publication Date: 2020-09-22
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 self-assembled wo of nanorods <sub>3</sub> micron shuttle nh <sub>3</sub> Gas sensor and its preparation method
  • A self-assembled wo of nanorods <sub>3</sub> micron shuttle nh <sub>3</sub> Gas sensor and its preparation method
  • A self-assembled wo of nanorods <sub>3</sub> micron shuttle nh <sub>3</sub> Gas sensor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The WO described in this example is based on the synthesis of scheelite concentrate self-assembled by nanorods 3 Micro Shuttle NH 3 gas sensor. The X-ray diffraction pattern of the scheelite concentrate used in this embodiment is as follows figure 1 As shown in (a), the results show that the main useful mineral in the scheelite concentrate is CaWO 4 , figure 1 (b) is the result of particle size analysis of scheelite concentrate, which shows that the particle size distribution of scheelite concentrate is mainly between 10 and 100 μm.

[0040] A WO self-assembled from nanorods 3 Micro Shuttle NH 3 Gas sensor, its structure diagram is as follows figure 2 As shown, it consists of a ceramic tube 1, a platinum lead 2, a gold electrode 3, a heating wire 4 and a gas-sensitive coating 5; the ceramic tube 1 is made of Al 2 o 3 The ceramic tube, the heating wire 4 is a Ni-Cr heating wire; the gold electrode 3 is covered on the surface of the ceramic tube 1 to form a ceram...

Embodiment 2

[0054] A WO self-assembled from nanorods 3 Micro Shuttle NH 3 Gas sensor, its structure diagram is as follows figure 2 As shown, it consists of a ceramic tube 1, a platinum lead 2, a gold electrode 3, a heating wire 4 and a gas-sensitive coating 5; the ceramic tube 1 is made of Al 2 o 3 The ceramic tube, the heating wire 4 is a Ni-Cr heating wire; the gold electrode 3 is covered on the surface of the ceramic tube 1 to form a ceramic tube electrode, the platinum lead 2 is welded on the surface of the gold electrode 3, and the heating wire 4 traverses in the ceramic tube 1 , the gas-sensitive coating 5 is coated on the entire surface of the ceramic tube 1 and the gold electrode 3 to form a WO composed of nanorods self-assembled. 3 Micro Shuttle NH 3 gas sensor. The composition of the gas-sensitive coating 5 is WO 3 micron shuttle, the WO 3 The micro-shuttle has a diameter of 0.4-1.5 μm and a length of 0.6-1.4 μm, the diameter of the nanorod is 15-33 nm, and the length is...

Embodiment 3

[0064] A WO self-assembled from nanorods 3 Micro Shuttle NH 3 Gas sensor, its structure diagram is as follows figure 2 As shown, it consists of a ceramic tube 1, a platinum lead 2, a gold electrode 3, a heating wire 4 and a gas-sensitive coating 5; the ceramic tube 1 is made of Al 2 o 3 The ceramic tube, the heating wire 4 is a Ni-Cr heating wire; the gold electrode 3 is covered on the surface of the ceramic tube 1 to form a ceramic tube electrode, the platinum lead 2 is welded on the surface of the gold electrode 3, and the heating wire 4 traverses in the ceramic tube 1 , the gas-sensitive coating 5 is coated on the entire surface of the ceramic tube 1 and the gold electrode 3 to form a WO composed of nanorods self-assembled. 3 Micro Shuttle NH 3 gas sensor. The composition of the gas-sensitive layer 5 is WO composed of nanorods self-assembled 3 micron shuttle, the WO 3 The micro-shuttle has a diameter of 0.4-1.5 μm and a length of 0.6-1.4 μm, the diameter of the nano...

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Abstract

The invention discloses a WO self-assembled by nanorods 3 Micron spindle NH 3 A gas sensor and a preparation method thereof belong to the technical field of semiconductor oxide gas sensors. The gas sensor is mainly composed of an electrode element and WO evenly coated on the electrode element. 3 Micron spindle composition, the WO 3 Micron Shuttle by WO 3 Nanorods are self-assembled, the WO 3 The diameter of the micron shuttle is 0.4-1.5 μm and the length is 0.6-1.4 μm. The WO 3 The diameter of the nanorods is 15-33nm and the length is 80-1050nm, and the WO 3 Micron spindle has a hexagonal phase crystal structure. The WO self-assembled by nanorods according to the present invention 3 Micron spindles have structural characteristics such as single crystal phase, high crystallinity, uniform morphology, high porosity, and large specific surface area. The gas sensor of the present invention has the ability to respond to NH 3 High gas selectivity, fast response at low operating temperature and other characteristics.

Description

technical field [0001] The invention belongs to the technical field of semiconductor oxide gas sensor, in particular to a WO 3 Micro Shuttle NH 3 Gas sensor and its preparation method. Background technique [0002] In the fields of environment, automobile, chemical industry and medical diagnostics, people pay more and more attention to the detection of harmful gases. Harmful gases account for a large proportion of exhaust emissions, which can cause damage to the upper respiratory tract mucous membranes of humans and animals. Slight inhalation can cause inflammation, breathing difficulties, etc. Excessive inhalation may be life-threatening and cause damage to the skin and conjunctiva. Severe burns and even blindness. The human body continues to inhale harmful gases with high concentrations such as NH 3 、H 2 S, etc., can be poisoned or even life-threatening in a short period of time. Ammonia (NH 3 ) is a colorless gas with a strong irritating odor. It has a strong corro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00G01N27/127
Inventor 沈岩柏李停停卢瑞李昂刘文刚韩聪魏德洲
Owner NORTHEASTERN UNIV LIAONING
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