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Light-excited formaldehyde gas sensor and preparation process thereof

A formaldehyde gas and preparation technology, applied in the field of sensors, can solve the problems of detonating flammable gases, shortening service life, increasing energy consumption, etc., and achieve the effect of strengthening gas-sensing selectivity, improving adsorption capacity, and increasing surface electron concentration

Inactive Publication Date: 2018-10-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the semiconductor gas sensor is not ideal for gas characteristics at room temperature. It is usually necessary to install a heating wire on the gas sensor element to increase the working temperature of the element, overcome the high reaction activation energy of the semiconductor material, and enhance the sensitivity of the gas sensor.
However, there are many deficiencies and defects in improving the performance of components through heating, which not only increases energy consumption, but also easily detonates flammable gases in the environment, causing safety hazards
At the same time, it will also deteriorate the performance of the components and shorten the service life

Method used

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  • Light-excited formaldehyde gas sensor and preparation process thereof
  • Light-excited formaldehyde gas sensor and preparation process thereof
  • Light-excited formaldehyde gas sensor and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A light-excited formaldehyde gas sensor, including a light source, a gas-sensitive material and a substrate, the gas-sensitive material is evenly coated on the surface of the substrate, and the gas-sensitive material is composed of a hollow microsphere zinc oxide tin dioxide double-layer heterojunction Composite nanomaterials, coated with a thickness of 1 μm to 100 μm. The hollow microsphere zinc oxide tin dioxide double-layer heterojunction composite nanomaterial is composed of a tin dioxide nano hollow sphere in the inner layer and a zinc oxide coating shell in the outer layer, and the zinc oxide coating shell accounts for 100% of the composite nanomaterial. 10%-30% of the mass. The diameter of the composite nanomaterial sphere is 100nm-300nm, the diameter of the inner tin dioxide hollow nanosphere is about 100nm-250nm, the thickness of the tin dioxide spherical shell is about 10nm-20nm, and the outer zinc oxide shell is about 20nm -40nm, the gap between the two laye...

Embodiment 2

[0039] see image 3 As shown, a light-excited formaldehyde gas sensor testing system provided in this embodiment includes a multimeter, a fan, a sensor, an ultraviolet LED, and a heater. The gas sensor is a thick film resistive sensor, and the thickness of the sensitive material is about 1 μm to 100 μm.

[0040] Wherein, the gas sensor includes a semiconductor gas sensitive material and a substrate.

[0041] The semiconductor gas-sensing material is a hollow microsphere zinc oxide tin dioxide double-layer heterojunction composite nanomaterial, which is prepared by template method and high temperature calcination. The diameter of a single hollow nanosphere is about 100-300nm, and the thickness of the spherical shell is 30-50nm. An organic solvent is applied to the surface of the substrate.

[0042] The substrate is a Si substrate with Au electrodes.

[0043] Among them, the ultraviolet light LED is a bead-type LED light source with a light wavelength of 365nm and a power of ...

Embodiment 3

[0049] A light-excited formaldehyde gas sensor, including a light source, a gas-sensitive material and a substrate, the gas-sensitive material is evenly coated on the surface of the substrate, and the gas-sensitive material is composed of a hollow microsphere zinc oxide tin dioxide double-layer heterojunction Composite nanomaterials, coated with a thickness of 1 μm to 100 μm. The hollow microsphere zinc oxide tin dioxide double-layer heterojunction composite nanomaterial is composed of a tin dioxide nano hollow sphere in the inner layer and a zinc oxide coating shell in the outer layer, and the zinc oxide coating shell accounts for 100% of the composite nanomaterial. 10%-30% of the mass. The diameter of the composite nanomaterial sphere is 100nm-300nm, the diameter of the inner tin dioxide hollow nanosphere is about 100nm-250nm, the thickness of the tin dioxide spherical shell is about 10nm-20nm, and the outer zinc oxide shell is about 20nm -40nm, the gap between the two laye...

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Abstract

The invention belongs to the technical field of sensors and provides a light-excited formaldehyde gas sensor and a preparation process thereof. The sensor comprises a light source, a gas-sensitive material and a substrate, wherein the gas-sensitive material is uniformly coated on the surface of the substrate; the component of the gas-sensitive material is a hollow microsphere zinc oxide and stannic oxide heterojunction composite nanometer material; the coating thickness of the gas-sensitive material is 1-100 microns; the service condition is that LED lamp bead irritation is performed at the band of 365nm. The formaldehyde sensor disclosed by the invention is high in response of formaldehyde gas, and also has the characteristics of being excellent in selectivity, sensitivity and stability and capable of working at a room temperature.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a light-excited formaldehyde gas sensor and a preparation process thereof. Background technique [0002] Gas sensors are mainly used for the detection of various gases, especially ambient gases. The requirement for pollution control of toxic and harmful gases in the environment has accelerated the research of gas sensors. Gas sensors in the prior art are mainly used for the detection of carbon monoxide gas, methane gas, coal gas, freon (R11, R12), ethanol in exhaled breath, bad breath in human oral cavity, etc. It converts the gas type and its concentration-related information into electrical signals, and according to the strength of these electrical signals, information related to the existence of the gas to be measured in the environment can be obtained, so that detection, monitoring, and alarm can be carried out; It can form an automatic detection, control and al...

Claims

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Application Information

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IPC IPC(8): G01N27/12C01G19/02C01G9/02B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G9/02C01G19/02C01P2002/72C01P2004/04C01P2004/62C01P2004/64C01P2004/84G01N27/127
Inventor 李晓干陈宇鹏李欣宇刘春晖何婷婷
Owner DALIAN UNIV OF TECH
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