Cobalt tetroxide/zinc oxide nanoflower heterojunction film sensitive to acetone

A nano-technology of cobalt tetraoxide and zinc oxide, which is applied in the field of gas sensor, and achieves the effects of low raw material cost, good repeatability and simple preparation

Inactive Publication Date: 2020-02-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports in the literature on the application of ZIF-67 / ZIF-8 derived cobalt tetroxide / zinc oxide nanoflowers to the detection of acetone gas.

Method used

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  • Cobalt tetroxide/zinc oxide nanoflower heterojunction film sensitive to acetone
  • Cobalt tetroxide/zinc oxide nanoflower heterojunction film sensitive to acetone
  • Cobalt tetroxide/zinc oxide nanoflower heterojunction film sensitive to acetone

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Embodiment 1

[0021] Example 1, 0.8294 g of cobalt nitrate hexahydrate and 0.0446 g of zinc nitrate hexahydrate were dissolved in 25 ml of methanol solution, stirred for 15 minutes, and recorded as solution A. Dissolve 0.328 g of dimethylimidazole in 25 ml of methanol solution, stir for 15 minutes, and record it as solution B. Quickly inject solution B into solution A, stir for 15 minutes, and record it as solution C. Pour solution C into a 100 ml reaction kettle and react at 120°C for 1.5 hours. The obtained product was centrifuged and washed several times with methanol solution, and then the product was put into a vacuum drying oven at 70° C. to dry overnight to obtain a ZIF-67 / ZIF-8 nano-flower yellow product. The above ZIF-67ZIF-8 nanoflower powder was placed in a tube furnace, and heat-treated in an air atmosphere at 400°C for 2 hours, with a heating rate of 2°C per minute, and finally a black powder of tricobalt tetroxide / zinc oxide nanoflower composite was obtained. When zinc nitra...

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Abstract

The invention provides a preparation method of a cobalt tetroxide / zinc oxide nanoflower heterojunction film that can be used for detecting low-concentration acetone, and belongs to the technical fieldof gas sensitive sensors. A ZIF-67 / ZIF-8 precursor is firstly prepared under solvothermal conditions by using a cobalt source, a zinc source and imidazole as reactants and using methanol as a solvent, then the ZIF-67 / ZIF-8 precursor is calcined in a tube furnace to obtain a cobalt tetroxide / zinc oxide nanoflower composite, and finally, a cobalt tetroxide / zinc oxide device is prepared by using a drop coating method, and the sensitivity of a pure cobalt tetroxide nanoflower and the composite cobalt tetroxide / zinc oxide nanoflower to acetone is compared. The sample still has a relatively high response value (298%) and a shorter response / recovery time (16 seconds / 25 seconds) at 10 ppm acetone. The preparation method of the sensor film is simple, the raw material cost is low, the material filmhas excellent performance, and the application value and prospect are very good.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to the preparation of a MOF (metal organic framework)-derived Co3O3 / ZnO nanoflower heterojunction film and the research on its gas-sensing performance to acetone. Background technique [0002] Acetone is an organic solvent for the manufacture of materials such as explosives, rubber, plastics, and fibers. It is also a raw material for the synthesis of organic substances such as ketene, polyisoprene rubber, and epoxy resin. It is widely used in military, chemical, and medical fields ( Sens. Actuators B: Chem., 2015, 209, 368-376). However, acetone gas, as a colorless toxic gas, can cause irreversible damage to the human body and the environment. The human body is exposed to acetone atmosphere for a long time, even a trace amount (≤1ppm) of acetone can cause chronic poisoning such as nose, throat, lung inflammation, headache, dizziness, nausea, etc., and more seriously...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y15/00B82Y30/00
CPCG01N27/127B82Y15/00B82Y30/00
Inventor 薛庆忠李坤常晓李小芳熊雅乔煦容王萍
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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