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Gas sensor based on graded porous WO3 microspheres and preparation method thereof

A gas sensor, hierarchical porous technology, applied in separation methods, chemical instruments and methods, and techniques for producing decorative surface effects, etc., can solve the problems of high energy consumption, blank, sensor integration complexity, etc., to achieve response and The recovery time is short, the output is large, and the effect of solving the problem of poor gas sensitivity characteristics

Active Publication Date: 2016-02-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the past, for the liquid-phase synthesis of WO 3 In the study of hydrothermal synthesis of micro / nanomaterials, only a single adjuvant (such as cetyltrimethylammonium bromide (CTAB), sodium dodecylbenzenesulfonate (SDBS), dodecyl Sodium sulfonate (SDS), potassium sulfate (K 2 SO 4 ), sodium sulfate (Na 2 SO 4 ), citric acid (C 6 h 8 o 7 ), oxalic acid (H 2 C 2 o 4 ), polyethylene glycol (PEG), etc.) to WO 3 The structure, morphology and characteristics of the material, and for the preparation of WO under the condition of mixing auxiliary agents 3 Research on materials is relatively blank
In addition, most of the current semiconductor oxide gas sensors can only obtain good gas sensing characteristics at an operating temperature above 200 °C, resulting in high energy consumption for detection and complexity of sensor integration.

Method used

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  • Gas sensor based on graded porous WO3 microspheres and preparation method thereof
  • Gas sensor based on graded porous WO3 microspheres and preparation method thereof
  • Gas sensor based on graded porous WO3 microspheres and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Based on hierarchical porous WO of this embodiment 3 Gas sensors with microspheres, such as figure 1 As shown, it includes a platinum wire 1, a ceramic tube 2, a gas-sensitive coating 3, an interdigitated gold electrode 4 and a heating wire 5, wherein the heating wire 5 passes through the ceramic tube 2 and welds its two ends to the base On the heating electrode of the seat, the interdigitated gold electrode 4 is covered on the outer surface of the ceramic tube 2 and welded on the measuring electrode of the base through the platinum wire 1, and the gas-sensitive coating 3 is coated on the outer surface of the interdigitated gold electrode 4; The composition of the gas-sensitive coating 4 is hierarchically porous WO 3 Microspheres, Graded Porous WO 3 Microspheres have a single hexagonal phase crystal structure, the size of the spheres is uniform and the individual dispersion is good, the diameter is between 3 and 5 μm, and each hierarchical porous WO 3 Microspheres ar...

Embodiment 2

[0041] Based on hierarchical porous WO of this embodiment 3 Gas sensors with microspheres, such as figure 1 As shown, the present embodiment based on hierarchical porous WO 3 Gas sensors with microspheres, such as figure 1 As shown, it includes a platinum wire 1, a ceramic tube 2, a gas-sensitive coating 3, an interdigitated gold electrode 4 and a heating wire 5, wherein the heating wire 5 passes through the ceramic tube 2 and welds its two ends to the base On the heating electrode of the seat, the interdigitated gold electrode 4 is covered on the outer surface of the ceramic tube 2 and welded on the measuring electrode of the base through the platinum wire 1, and the gas-sensitive coating 3 is coated on the outer surface of the interdigitated gold electrode 4; The composition of the gas-sensitive coating 4 is hierarchically porous WO 3 Microspheres, Graded Porous WO 3 Microspheres have a single hexagonal phase crystal structure, the size of the spheres is uniform and the ...

Embodiment 3

[0050] Based on hierarchical porous WO of this embodiment 3 Gas sensors with microspheres, such as figure 1 As shown, the present embodiment based on hierarchical porous WO 3 Gas sensors with microspheres, such as figure 1 As shown, it includes a platinum wire 1, a ceramic tube 2, a gas-sensitive coating 3, an interdigitated gold electrode 4 and a heating wire 5, wherein the heating wire 5 passes through the ceramic tube 2 and welds its two ends to the base On the heating electrode of the seat, the interdigitated gold electrode 4 is covered on the outer surface of the ceramic tube 2 and welded on the measuring electrode of the base through the platinum wire 1, and the gas-sensitive coating 3 is coated on the outer surface of the interdigitated gold electrode 4; The composition of the gas-sensitive coating 4 is hierarchically porous WO 3 Microspheres, Graded Porous WO 3 Microspheres have a single hexagonal phase crystal structure, the size of the spheres is uniform and the ...

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Abstract

The invention belongs to the technical field of semiconductor oxide gas sensors, and particularly relates to a gas sensor based on graded porous WO3 microspheres and a preparation method thereof. A gas-sensitive coating in the gas sensor based on the graded porous WO3 microspheres is prepared from the graded porous WO3 microspheres, the graded porous WO3 microspheres have single hexagonal-phase crystal structures and are uniform in body size and good in individual dispersity, the diameter of the graded porous WO3 microspheres is 3-5 micrometers, and each graded porous WO3 microsphere is formed by assembling WO3 nanorods with the diameter being at the nanoscale and has a large specific surface area and high porosity. According to the preparation method, hydro-thermal synthesis is performed in the presence of a mixing assistant, and the graded porous WO3 microspheres are obtained and assembled to form the finished product. The gas sensor based on the graded porous WO3 microspheres has the advantages of being low in working temperature, high in sensitivity, low in energy consumption, high in selectivity and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor oxide gas sensors, in particular to a hierarchical porous WO 3 Microsphere gas sensor and its preparation method. Background technique [0002] In the process of industrialization in our country, with the development of science and technology and the continuous expansion of industrial scale, especially in the fields of minerals, coal, chemicals, petroleum, automobiles, etc., in the production process and use of products, toxic and harmful There are more and more types of flammable and explosive gases, resulting in increasing environmental pollution. With the continuous strengthening of people's awareness of environmental protection, in order to improve the quality of life, it will be of great practical significance to develop and develop high-performance gas sensors to monitor the atmosphere, alarm flammable gases, and detect toxic and harmful gases. [0003] Among the various gas sensors,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B81B1/00B81C1/00
Inventor 沈岩柏魏德洲陈享享王玮刘文刚韩聪
Owner NORTHEASTERN UNIV
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