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Ethanol gas sensor based on Ga-doped beta-Fe2O3 nano octahedral sensitive material and preparation method of ethanol gas sensor

A beta-fe2o3, gas sensor technology, applied in the direction of analysis of materials, material resistance, material analysis through electromagnetic means, etc., can solve the problems of easy explosion, threat to life and property safety, etc., achieve small device size, improve gas sensitivity response , suitable for mass production

Pending Publication Date: 2022-01-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the leaked ethanol reaches a certain concentration, it is very easy to explode when exposed to an open flame, threatening the safety of people's lives and property

Method used

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  • Ethanol gas sensor based on Ga-doped beta-Fe2O3 nano octahedral sensitive material and preparation method of ethanol gas sensor
  • Ethanol gas sensor based on Ga-doped beta-Fe2O3 nano octahedral sensitive material and preparation method of ethanol gas sensor
  • Ethanol gas sensor based on Ga-doped beta-Fe2O3 nano octahedral sensitive material and preparation method of ethanol gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0033] 1. Treatment of Pd metal interdigitated electrodes:

[0034] Wipe the Al with Pd metal interdigitated electrodes with acetone and ethanol cotton balls respectively 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, and finally dried at 100 °C;

[0035] The present invention uses screen printing technology on Al 2 o 3 Prepare Pd metal interdigitated electrodes on the substrate, the specific method is as follows: mix the ink [Jiahua JX07500487], Pd powder, and diluent at a mass ratio of 1:1:2, stir to make a paste; then pour the paste into On to the screen plate with the interdigitated electrode pattern, scrape the paste under the condition of 30 ° tilt angle and 5 Newton pressure, in Al 2 o 3 The interdigitated electrodes are printed on the substrate and dried, and the preparation of the Pd metal interdigitated el...

Embodiment 3

[0046] The treatment process of the Pd metal interdigitated electrodes is the same as that in Example 2.

[0047] 0.20g of terephthalic acid, 0.68g of ferric chloride hexahydrate and 0.052g of gallium nitrate were dissolved in 15mL of dimethylformamide (analytically pure), stirred for 2h; Reaction at 110°C for 20 hours; after cooling to room temperature, the product was centrifuged with ethanol and dried at 70°C for 24 hours; finally annealed at 400°C for 2 hours in air to obtain a Fe / Ga bimetallic organic framework Derived Ga-doped beta-Fe 2 o 3 nano-sensitive materials.

[0048] Ga-doped beta-Fe derived from Fe / Ga bimetallic organic frameworks 2 o 3 Preparation of nano-sensitive material gas sensor: the experimental process is the same as in Example 2, and the device prepared based on this material is marked as S3.

Embodiment 4

[0050] The preparation process of the Pd metal interdigitated electrode is the same as in Example 2.

[0051] 0.20g of terephthalic acid, 0.68g of ferric chloride hexahydrate and 0.078g of gallium nitrate were dissolved in 15mL of dimethylformamide (analytically pure), stirred for 2h; Reaction at 110°C for 20 hours; after cooling to room temperature, the product was centrifuged with ethanol and dried at 70°C for 24 hours; finally annealed at 400°C for 2 hours in air to obtain a Fe / Ga bimetallic organic framework Derived Ga-doped beta-Fe 2 o 3 nano-sensitive materials.

[0052] Ga-doped beta-Fe derived from Fe / Ga bimetallic organic frameworks 2 o 3 Preparation of nano-sensitive material gas sensor: the experimental process is the same as in Example 2, and the device prepared based on this material is marked as S4.

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Abstract

The invention discloses an ethanol gas sensor based on a Ga-doped beta-Fe2O3 nano octahedral sensitive material derived from a Fe / Ga bimetal organic framework and a preparation method of the ethanol gas sensor, and belongs to the technical field of gas sensors. The sensor is composed of an Al2O3 substrate, a Pd metal interdigital electrode and a Ga-doped beta-Fe2O3 nano sensitive material layer from bottom to top, wherein the Pd metal interdigital electrode is coated with the Ga-doped beta-Fe2O3 nano sensitive material layer derived on the basis of a Fe / Ga bimetal organic framework. According to the invention, GA (III) is doped into an MIL-53 (Fe) organic framework structure, the initial particle size of MOF is affected, thermal conversion of Fe2O3 from a beta phase to an alpha phase is inhibited, the excellent chemical sensitivity characteristic of beta-Fe2O3 can be effectively utilized to improve the gas-sensitive response, and the gas-sensitive performance of the gas sensor is improved. The sensor has good detection performance on ethanol gas, and has the advantages of simple process, small device size and suitability for mass production.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a Ga-doped beta-Fe derived from Fe / Ga bimetallic organic framework 2 o 3 An ethanol gas sensor of a nano-octahedral sensitive material and a preparation method thereof. Background technique [0002] With the rapid development of industry and technology, while the material wealth is extremely rich, the problems of production safety and environment are becoming increasingly prominent. 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 n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 阮圣平樊怡灼周敬然刘彩霞李昕马艳
Owner JILIN UNIV
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