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Oxygen vacancy dominated CuO/ZnFe2O4 core-shell structure microsphere-based xylene gas sensor and preparation method thereof

A technology of gas sensor and core-shell structure, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve problems such as people's health and life threats, and achieve the effects of fast response recovery, simple process, and low cost

Active Publication Date: 2019-02-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once these flammable, explosive, toxic and harmful gases are produced or leaked, they will pose a threat to people's health and life.

Method used

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  • Oxygen vacancy dominated CuO/ZnFe2O4 core-shell structure microsphere-based xylene gas sensor and preparation method thereof
  • Oxygen vacancy dominated CuO/ZnFe2O4 core-shell structure microsphere-based xylene gas sensor and preparation method thereof
  • Oxygen vacancy dominated CuO/ZnFe2O4 core-shell structure microsphere-based xylene gas sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Treatment of Pd metal finger electrodes

[0041] First, use acetone and ethanol cotton balls to wipe the Al with Pd metal inter-finger electrodes (prepared by screen printing technology). 2 o 3 substrate, and then Al with Pd metal interfinger electrodes 2 o 3 The substrate was placed in acetone, ethanol and deionized water in turn, ultrasonically cleaned for 10 minutes, and finally dried at 100 °C;

[0042] The present invention uses screen printing technology on Al 2 o 3 Prepare Pd metal finger electrodes on the substrate, the specific method is as follows: mix ink [Jiahua JX07500487]: Pd powder: diluent at a mass ratio of 1:1:2, stir to make a paste; then inject the paste into On the screen plate with the pattern of the inserted finger electrode, scrape the paste at an inclination angle of 30° and a pressure of 5 Newtons, in Al 2 o 3 The electrode is printed on the substrate and dried, and the preparation of the Pd metal finger electrode is completed after u...

Embodiment 2

[0054] The sensitivity is 16.3 (100ppm xylene);

[0055] The response time is 15 seconds and the recovery time is 6 seconds.

Embodiment 3

[0057] The sensitivity is 23.7 (100ppm xylene);

[0058] The response time was 27 seconds and the recovery time was 14 seconds.

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Abstract

The invention discloses an oxygen vacancy dominated CuO / ZnFe2O4 core-shell structure microsphere-based xylene gas sensor and a preparation method thereof, and belongs to the technical field of gas sensors. The xylene gas sensor comprises an Al2O3 substrate with a Pd metal interdigital electrode, and a CuO / ZnFe2O4 core-shell structure microsphere sensitive layer prepared with a coating technology on the Pd metal interdigital electrode and the Al2O3 substrate sequentially from bottom to top, wherein the particle size of a CuO / ZnFe2O4 core-shell structure microsphere is 1-1.2 [mu]m; and CuO nano-particles are modified on a ZnFe2O4 nano-microsphere to form the CuO / ZnFe2O4 core-shell structure microsphere. The process is simple; and the prepared xylene gas sensor is small in size and suitable for mass production, so that the xylene gas sensor has important application values. The xylene gas sensor has the characteristics of being simple in preparation method, low in cost and high in response recovery speed, is expected to be produced on a large scale, and has good detection performance on xylene.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a sensor based on CuO / ZnFe dominated by oxygen vacancies 2 o 4 A xylene gas sensor of core-shell microspheres and a preparation method thereof. Background technique [0002] With the rapid development of industry and technology, while the material wealth is extremely rich, the health problems caused by volatile organic compounds have become the focus of social attention. People have more and more opportunities to be exposed to dangerous gases, such as natural gas with methane and carbon monoxide as the main components, organic volatile toxic gases formaldehyde, benzene, xylene released from decoration materials, sulfur dioxide and sulfur dioxide in coal combustion and automobile exhaust. nitrogen oxides, etc. Once these flammable, explosive, toxic and harmful gases are produced or leaked, they will pose a threat to people's health and lives. Therefore, it is v...

Claims

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Application Information

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IPC IPC(8): G01N27/407
CPCG01N27/4071
Inventor 阮圣平张楠刘彩霞温善鹏周敬然李昕
Owner JILIN UNIV
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