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ZnSe/ZnO based nitrogen dioxide gas sensor and preparation processthereof

A gas sensor and nitrogen dioxide technology, applied in the direction of material resistance, etc., can solve the problems of cumbersome preparation process, etc., and achieve the effect of simple process flow, improved gas-sensing performance, and good gas-sensing performance

Inactive Publication Date: 2019-06-07
HAINAN UNICAN SCI & TECH INNOVATION INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of technology, the heating resistance wire embedded in the ceramic tube is mainly used, and the preparation process is relatively cumbersome.

Method used

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  • ZnSe/ZnO based nitrogen dioxide gas sensor and preparation processthereof
  • ZnSe/ZnO based nitrogen dioxide gas sensor and preparation processthereof
  • ZnSe/ZnO based nitrogen dioxide gas sensor and preparation processthereof

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Embodiment 1

[0028] The nitrogen dioxide gas sensor based on ZnSe / ZnO is composed of a gas sensitive material and a heating electrode, and the gas sensitive material is uniformly coated on the surface of the heating electrode, and the coating thickness is 80 μm. The gas-sensitive material component is a heterojunction composite nanomaterial formed by zinc selenide and zinc oxide prepared by an in-situ oxidation method, and the size of the material is 400nm. The preparation method comprises the following steps:

[0029] Step 1, preparation of ZnSe / ZnO heterojunction: Zinc selenide powder is placed in the ark and put into a tube furnace, and a dry mixed gas of 20% oxygen (50sccm) and 80% nitrogen (200sccm) is introduced at the same time, with 3 Heating at a speed of ~5°C / min, the reaction temperature is 400°C, the reaction time is 2h, and then naturally cooled to room temperature to obtain a ZnSe / ZnO heterojunction.

[0030] Step 2, preparing the gas sensor: put a small amount of ZnSe / ZnO h...

Embodiment 2

[0036] The nitrogen dioxide gas sensor based on ZnSe / ZnO is composed of a gas sensitive material and a heating electrode, and the gas sensitive material is uniformly coated on the surface of the heating electrode, and the coating thickness is 50 μm. The gas-sensitive material component is a heterojunction composite nanomaterial formed by zinc selenide and zinc oxide prepared by an in-situ oxidation method, and the size of the material is 200nm. The preparation method comprises the following steps:

[0037] Step 1, preparation of ZnSe / ZnO heterojunction: Zinc selenide powder is placed in the ark and put into a tube furnace, and a dry mixed gas of 20% oxygen (50sccm) and 80% nitrogen (200sccm) is introduced at the same time, with 3 Heating at a speed of ~5°C / min, the reaction temperature is 600°C, the reaction time is 0.5h, and then naturally cooled to room temperature to obtain a ZnSe / ZnO heterojunction.

[0038] Step 2, preparing the gas sensor: put a small amount of ZnSe / ZnO...

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Abstract

The invention discloses a ZnSe / ZnO based nitrogen dioxide gas sensor and a preparation process thereof. The sensor comprises a gas sensitive material and a heating electrode, wherein the gas sensitivematerial is coated on the surface of the heating electrode, the coating thickness is 50-80 microns, and the gas sensitive material is a heterojunction composite nano-material formed by zinc selenideand zinc oxide. The preparation process comprises the steps of first, placing zinc selenide powder in an ark, putting the ark in a tubular furnace, introducing a dry gas mixture of 20% of oxygen and 80% of nitrogen for heating at the same time, and reacting at a temperature of 400 DEG C-600 DEG C for 0.5h-4h, then naturally cooling to the room temperature to obtain a ZnSe / ZnO heterojunction; second, putting the ZnSe / ZnO heterojunction powder into a mortar, adding deionized water, and grinding until the solution is in uniform suspension; taking the suspension, coating the suspension on the surface of the heating electrode, placing the sensor in a drying oven to dry at a temperature of 80 DEG C so as to obtain a nitrogen dioxide gas sensor. The nitrogen dioxide gas sensor has the advantagesof simple processing steps, low cost and sensitive response to nitrogen dioxide.

Description

technical field [0001] The invention belongs to the technical field of nitrogen dioxide gas sensors, and in particular relates to a ZnSe / ZnO-based nitrogen dioxide gas sensor and a preparation process. Background technique [0002] Nitrogen dioxide is one of the most common toxic gases that cause air pollution. It mainly comes from high-temperature calcination of fossil fuels, industrial waste gas, and exhaust emissions from motor vehicles. In view of the toxicity of nitrogen dioxide, when the human body is in an environment of nitrogen dioxide with a concentration greater than 8ppm for more than 5 hours, the human body will cause irreversible and serious damage. In recent years, gas sensors for detecting nitrogen dioxide are mostly made of metal oxide semiconductor materials. This type of sensor generally requires a high temperature working environment above 300°C, and its response sensitivity and anti-interference performance are average. In terms of technology, ceramic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 林仕伟刘炜李晓干张俊平陈汉德周义龙顾丁王雪燕
Owner HAINAN UNICAN SCI & TECH INNOVATION INST CO LTD
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