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Formaldehyde gas sensor based on CoFe<2>O<4>/Co<3>O<4> double-shell structure cubic material and preparation method thereof

A formaldehyde gas, cofe2o4 technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of people's health and life threats, and achieve the effect of improving gas sensing performance, small size, and small device size

Active Publication Date: 2019-07-30
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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  • Formaldehyde gas sensor based on CoFe&lt;2&gt;O&lt;4&gt;/Co&lt;3&gt;O&lt;4&gt; double-shell structure cubic material and preparation method thereof
  • Formaldehyde gas sensor based on CoFe&lt;2&gt;O&lt;4&gt;/Co&lt;3&gt;O&lt;4&gt; double-shell structure cubic material and preparation method thereof
  • Formaldehyde gas sensor based on CoFe&lt;2&gt;O&lt;4&gt;/Co&lt;3&gt;O&lt;4&gt; double-shell structure cubic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0043] 1. Treatment of Pd metal finger electrodes

[0044] 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;

[0045] 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 the ink [Jiahua JX07500487]: Pd powder: diluent at a mass ratio of 1:1:2, stir to make a paste; then pour 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 inter-finger electrode is completed...

Embodiment 4

[0054] First, use acetone and ethanol cotton balls to wipe the Al surface of the Pd intercalated electrode prepared by screen printing technology. 2 o 3 After the substrate is clean, place the interposed electrode in acetone, ethanol and deionized water in sequence, ultrasonically clean it for 5 minutes respectively, and finally dry it at 100°C for later use.

[0055] The preparation process of the Pd metal interdigitated electrode is the same as in Example 1.

[0056] The preparation process of the ZIF-67 nanocube material is the same as in Example 1.

[0057] 50 mg of the prepared ZIF-67 nanocube material was dispersed in 30 ml of ethanol, and then the suspension was heated to 60° C. under constant stirring. Mix 50 mg of potassium ferricyanide and 0.2 ml of acetic acid solution (0.1 mol / l) in 10 ml of water to form a homogeneous solution. The two solutions were then combined and stirring was continued for 1 hour. The role of dilute acetic acid was to etch the surface of ...

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Abstract

The invention discloses a formaldehyde gas sensor based on a CoFe<2>O<4> / Co<3>O<4> double-shell structure cubic material and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor consists of an Al<2>O<3> substrate, a Pd metal interdigital electrode, and a CoFe<2>O<4> / Co<3>O<4> double-shell structure cubic material prepared on the Al<2>O<3> substrate having thePd metal interdigital electrode by using a coating technology. When CoFe<2>O<4> is modified to a Co<3>O<4> hollow structure cube, lattice defects can be caused due to lattice mismatch; and these lattice defects can generate an oxygen vacancy to improve a gas sensitive response of a gas sensitive material. The invention has simple process, is small in prepared sensor, is applied to large-scale production and has an important application value. The formaldehyde gas sensor has the characteristics of simple preparation method, low cost, fast response recovery rate and low detection lower limit, and is expected to be produced in a large scale.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a sensor based on CoFe 2 o 4 / Co 3 o 4 A formaldehyde gas sensor of a cubic material with a double shell structure and a preparation method thereof, the sensor is capable of detecting formaldehyde at the ppb level. 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 po...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 阮圣平张楠刘彩霞周敬然李昕温善鹏
Owner JILIN UNIV
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