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Formaldehyde sensor based on zinc oxide/zinc cobaltate composite material and its preparation method

A composite material and sensor technology, applied in the direction of material resistance, material analysis, material analysis through electromagnetic means, etc., can solve problems such as catalytic activity limitation, and achieve the effect of improving gas sensitivity response, small size, and good detection performance

Active Publication Date: 2021-03-30
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, agglomeration of noble metal nanoparticles may lead to always limited catalytic activity

Method used

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  • Formaldehyde sensor based on zinc oxide/zinc cobaltate composite material and its preparation method
  • Formaldehyde sensor based on zinc oxide/zinc cobaltate composite material and its preparation method
  • Formaldehyde sensor based on zinc oxide/zinc cobaltate composite material and its preparation method

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Embodiment 1～3

[0041] 1. Treatment of Pd metal finger electrodes:

[0042] 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;

[0043] The present invention uses screen printing technology on Al 2 o 3 Prepare the Pd metal finger electrode on the substrate, the specific method is as follows: mix the ink [Jiahua JX07500487], Pd powder, and diluent in 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 3The electrode is printed on the substrate and dried, and the preparation of the Pd metal finger electrode is complete...

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Abstract

The invention, which belongs to the technical field of gas sensors, discloses a preparation method of a formaldehyde gas sensor based on a PdO-nanoparticle-modified ZnO / ZnCo2O4 composite material. Thesensor is composed of an Al2O3 substrate with a Pd metal interdigital electrode and a PdO-nanoparticle-modified ZnO / ZnCo2O4 composite material sensitive layer which is prepared on the Pd metal interdigital electrode and the Al2O3 substrate by adopting a coating technology. When the PdO nanoparticles are modified on a ZnO / ZnCo2O4 microsphere material, the gas sensitive response of the gas sensitive material is favorably improved because the nano-sized PdO nanoparticles have very strong formaldehyde catalytic oxidation capacity. The sensor provided by the invention has a low detection lower limit; and the process is simple, the prepared formaldehyde gas sensor has a small size and the sensor is suitable for mass production, so that the sensor has an important application value.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a zinc oxide (ZnO) / zinc cobaltate (ZnCoO) modified based on palladium oxide (PdO) nanoparticles. 2 o 4 ) formaldehyde sensor of composite material and a preparation method thereof, the sensor can detect formaldehyde at ppb level. Background technique [0002] Formaldehyde is a typical indoor air pollutant, which is classified as a carcinogen by the International Agency for Research on Cancer and mainly exists in furniture, decoration materials, clothing and chemical cleaners. In modern life, human beings spend more than 70% of their time indoors, and newly decorated rooms usually contain a certain concentration of formaldehyde, which is extremely harmful to the human body. The main harm of formaldehyde is shown as the stimulation to skin mucous membrane. When formaldehyde reaches a certain concentration indoors, people will feel uncomfortable. Greater than 0.08mg / m 3 Hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 阮圣平张楠刘彩霞周敬然李昕温善鹏
Owner JILIN UNIV
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