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 an NH3 gas-sensitive element prepared from a WO3 micrometer spindle formed through self-assembly of nanometer rods and a preparing method of the gas-sensitive element, and belongs to the technical field of gas-sensitive elements of semiconductor oxide. The gas-sensitive element is mainly composed of an electrode element body and the WO3 micrometer spindle uniformly coatingthe electrode element body. The WO3 micrometer spindle is formed through self-assembly of the WO3 nanometer rods, the diameter of the WO3 micrometer spindle is 0.4-1.5 micrometers, the length of the WO3 micrometer spindle is 0.6-1.4 micrometers, the diameter of each WO3 nanometer rod is 15-33 nm, the length of each WO3 nanometer rod is 80-1,050 nm, and the WO3 micrometer spindle is of a hexagonal-phase crystal structure. The WO3 micrometer spindle formed through self-assembly of the nanometer rods has the advantages that the crystal phase is single, the crystallinity degree is high, the morphology is uniform and consistent, the porosity is high, and the specific surface area is large. The gas-sensitive element has the advantages of high selectivity on NH3 gas, quick responses to low working temperature and the like.

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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