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Xylene gas sensor based on SnS2 sensitive layer modified by gold-palladium alloy and preparation method of xylene gas sensor

A technology of gas sensor and gold-palladium alloy, which is applied in the field of xylene gas sensor and its preparation, can solve problems such as xylene pollution, and achieve the effects of improved gas sensing performance, low cost, and low working temperature

Active Publication Date: 2021-06-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, accidental leakage during transportation, storage, etc. will also cause xylene pollution

Method used

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  • Xylene gas sensor based on SnS2 sensitive layer modified by gold-palladium alloy and preparation method of xylene gas sensor
  • Xylene gas sensor based on SnS2 sensitive layer modified by gold-palladium alloy and preparation method of xylene gas sensor
  • Xylene gas sensor based on SnS2 sensitive layer modified by gold-palladium alloy and preparation method of xylene gas sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0032] 1. Treatment of Pd metal interdigitated electrodes:

[0033] First, use acetone and ethanol cotton balls to wipe the Al with Pd metal interdigitated electrodes with a width of 3mm and a length of 4mm prepared by screen printing technology. 2 o 3 The substrate is clean, and then the Al with Pd metal interdigitated electrodes 2 o 3 The substrate was placed in acetone, ethanol and deionized water in turn, ultrasonically cleaned for 5 minutes respectively, and finally dried at 100°C for later use.

[0034] Among them, the present invention uses screen printing technology to prepare Pd metal interdigitated electrodes. The specific method is as follows: mix the ink [Jiahua JX07500487]: Pd powder: diluent in a mass ratio of 1:1:2, and stir to make a paste; then inject the paste into the On the screen plate, the paste was scraped under the conditions of an inclination angle of 30° and a pressure of 5 Newtons, the electrodes were printed and dried, and the preparation of Pd ...

Embodiment 1

[0045] The sensitivity is 2.49 (100ppm xylene);

[0046] The response time is 6 seconds and the recovery time is 8 seconds.

Embodiment 2

[0048] The sensitivity is 7.62 (100ppm xylene);

[0049] The response time is 5 seconds and the recovery time is 7 seconds.

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Abstract

The invention discloses a xylene gas sensor based on a SnS2 sensitive layer modified by gold-palladium alloy and a preparation method of the xylene gas sensor, and belongs to the technical field of gas sensors. The sensor consists of an Al2O3 substrate, a Pd metal interdigital electrode and a SnS2 sensitive layer which is modified by a gold-palladium alloy and is prepared on the Al2O3 substrate with the Pd metal interdigital electrode by adopting a coating technology from bottom to top in sequence. When the gold-palladium alloy is modified on the surface of SnS2, the gas sensor has good gas response and excellent gas selectivity due to the synergistic effect of double metals. Meanwhile, the process is simple, and the prepared xylene gas sensor is small in size and suitable for mass production, so that the method has important application value. The method has the characteristics of simple preparation method, low cost, high response and recovery speed and hopeful large-scale production, and has good detection performance on xylene gas.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a SnS based on gold-palladium alloy modification 2 A xylene gas sensor with a sensitive layer and a preparation method thereof. Background technique [0002] With the rapid development of industrial technology and the continuous improvement of human safety awareness, health problems caused by volatile organic compounds have become the focus of social attention. People are more and more frequently exposed to dangerous gases, such as natural gas with methane and carbon monoxide as the main components, organic volatile toxic gases formaldehyde, benzene, and xylene released from decoration materials, sulfur dioxide in coal combustion, and vehicle exhaust and 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 necessary to develop gas sensors with high sensi...

Claims

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Application Information

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IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 卢洋阮圣平刘大力周敬然刘彩霞李昕温善鹏
Owner JILIN UNIV
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