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Metal oxide-metal-organic frameworks (MOX@MOFs) nanometer core-shell structure one-dimensional array as well as preparation method and application thereof

A nano-core-shell and array technology is applied in the field of gas sensors, which can solve problems such as poor selectivity, achieve high-sensitivity detection, and be easy to promote.

Active Publication Date: 2016-04-20
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MOX-MOFs composite nanomaterials will combine their respective advantages in sensitivity and selectivity, so as to solve the problem of poor selectivity of MOX gas-sensitive materials at present, and prepare high-selectivity and high-sensitivity chemical resistance gas sensors

Method used

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  • Metal oxide-metal-organic frameworks (MOX@MOFs) nanometer core-shell structure one-dimensional array as well as preparation method and application thereof
  • Metal oxide-metal-organic frameworks (MOX@MOFs) nanometer core-shell structure one-dimensional array as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh zinc chloride and cobalt chloride (Zn:Co=1:1, total molar concentration 0.86mM), add 2.5mL water and 13.5mLDMF to dissolve in the reaction kettle, add 2-methylimidazole (30.4mM) and stir to form Transparent solution, put the ZnO one-dimensional array film grown by hydrothermal method on the sapphire wafer with the face down, put it into the solution, seal the reaction kettle and react at 60°C for 2h, rinse the surface of the composite array film after the reaction, and dry it in the air to dry.

Embodiment 2

[0028] Weigh zinc nitrate and cobalt nitrate (Zn:Co=0:1, total molar concentration 0.86mM), add 0mL water and 16mLDMF to dissolve in the reaction kettle, add 2-methylimidazole (76.0mM) and stir to form a transparent solution, and Solvothermal Growth of TiO on Sapphire Chips by Seed Layer Method 2 Put the one-dimensional array film face down into the solution, seal the reactor and react at 25°C for 12 hours. After the reaction, rinse the surface of the composite array film and dry it in the air.

Embodiment 3

[0030] Weigh zinc chloride and cobalt chloride (Zn:Co=3:1, total molar concentration 0.86mM), add 4mL water and 12mL DMF to dissolve in the reaction kettle, add imidazole (30.4mM) and stir to form a transparent solution, and the seed crystal Hydrothermal Growth of SnO on Polycrystalline Alumina Ceramic Sheets by Layer Method 2 Put the one-dimensional array film face down into the solution, seal the reactor and react at 120°C for 0.5h. After the reaction, rinse the surface of the composite array film and dry it in the air.

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Abstract

The invention provides an MOX@MOFs (metal oxide-metal-organic frameworks) nanometer core-shell structure one-dimensional array film which is characterized in that the film thickness is 2 to 4 micrometers, and the film is formed by a one-dimensional MOX@MOFs core-shell structure, wherein the diameter of a core MOX nanowire is 50 to 100nm, the thickness of a shell MOFs can be adjusted between 1nm to 200nm, metal nodes and organic chains of the MOFs can be adjusted. A typical preparation method comprises the steps of setting an MOX face of a ZnO one-dimensional array film downwards, adding into a mixed solution of water in which zinc salt, cobalt salt and organic ligands are dissolved and DMF, sealing a reaction still, then heating for reacting, after reacting, washing the surface of a compound array film, and drying the film in the air. The MOX@MOFs core-shell structure one-dimensional array film provided by the invention has excellent gas-sensitive property, not only can humidity interference be selectively eliminated, but also the working temperature can be reduced and the sensitivity can be improved through a Co catalysis. Meanwhile, the film also has the advantages that the method is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a metal oxide (MOX) bimetal organic framework material (MOFs) nano-core-shell structure one-dimensional array of a gas sensor for detecting volatile organic compounds for selectively eliminating humidity interference Thin films and methods for their preparation and use. Background technique [0002] Volatile organic compounds (volatile organic compounds, VOCs) refer to various organic compounds with a boiling point of 50°C-260°C at room temperature. According to their chemical structure, VOCs can be further divided into: alkanes, aromatics, esters, aldehydes and others. More than 300 species have been identified so far. The most common ones are acetone, benzene, toluene, xylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate (TDI), diisocyanocresyl, etc. When the concentration of volatile organic compounds in the indoor air is too high, it is easy to cause acu...

Claims

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Application Information

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IPC IPC(8): G01N27/04
CPCG01N27/04
Inventor 姚明水徐刚
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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