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Preparation method and applications of Co3O4@ZIF-67 core-shell structure material

A technology of core-shell structure and reaction, which is applied in the direction of analyzing materials, chemical instruments and methods, and material analysis through electromagnetic means, so as to achieve the effect of convenient, feasible and easy-to-scale preparation methods

Active Publication Date: 2020-02-21
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be used as a core-shell structure material for gas sensor applications
[0006] co 3 o 4 The shell of ZIF-67 was grown on the surface, and the Co 3 o 4 The literature of @ZIF-67 core-shell structure materials has not been reported yet

Method used

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  • Preparation method and applications of Co3O4@ZIF-67 core-shell structure material
  • Preparation method and applications of Co3O4@ZIF-67 core-shell structure material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 is the Co of thin shell layer 3 o 4 @ZIF-67 synthesis, including the following steps:

[0033] Step 1, first we prepared Co with a particle size of about 50nm by pyrolysis 3 o 4 As the matrix, the specific operation is to place cobalt acetate tetrahydrate in a crucible, heat it to 500°C at a rate of 2°C per minute, keep it for 1 hour, and then cool down to obtain black nano-Co 3 o 4 .

[0034] Step 2, weigh 0.1g of Co prepared in step 1 3 o 4 , was added to 10 g of methanol, kept under magnetic stirring, then added 0.01 g of ligand 2-methylimidazole (2-methylimidazole / Co molar ratio was 1:1), continued to stir for 5 minutes and then transferred to a 50 mL belt In the tetrafluoroethylene lining of the stainless steel jacket, after tightening, transfer it to a blast drying oven, and place it at 150°C for 3 days.

[0035] Step 3, step 2 After the reaction is completed, take the kettle to cool, and the product is filtered and washed with water, and then d...

Embodiment 2

[0036] Example 2 is thick shell Co 3 o 4 @ZIF-67 synthesis, including the following steps:

[0037] Step 1, with the nanometer Co in embodiment 1 3 o 4 preparation.

[0038] Step 2, weigh 0.1g of Co prepared in step 1 3 o 4 , was added to 10 g of methanol, kept under magnetic stirring, then added 0.03 g of ligand 2-methylimidazole (2-methylimidazole / Co molar ratio was 3:1), continued to stir for 5 minutes and then transferred to a 50 mL belt In the tetrafluoroethylene lining of the stainless steel jacket, after tightening, transfer it to a blast drying oven, and place it at 140°C for 2 days.

[0039] Step 3, step 2 After the reaction is completed, take the kettle to cool, and after the product is filtered and fully washed with water, it is dried at 60°C to obtain the thick-shelled Co 3 o 4 @ZIF-67.

[0040] The Co that embodiment 1 synthesizes obtains 3 o 4 @ZIF-67 and parent Co 3 o 4 For comparison of the XRD diffraction patterns, see figure 1 ,Depend on figure...

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Abstract

The invention relates to preparation of a Co3O4@ZIF-67 core-shell structure material and applications of the Co3O4@ZIF-67 core-shell structure material in gas sensors, wherein a layer of a ZIF-67 shell layer material grows on the surfaces of Co3O4 nanoparticles to realize the selective filtration of macromolecular gas. According to the invention, the Co3O4@ZIF-67 core-shell structure material prepared by the method can be used as a gas-sensitive sensing material, particularly shows good gas-sensitive selectivity on small molecular gases such as hydrogen, methanol and the like, and hardly responds to macromolecular gases; and the synthesis of the Co3O4@ZIF-67 core-shell structure material is reported for the first time, and is easy to implement.

Description

technical field [0001] The invention discloses a Co 3 o 4 @ZIF-67 The preparation of core-shell structure materials and the application of gas sensors, involving the preparation of sensing materials and the application of gas sensors. Background technique [0002] The gas sensitivity selectivity of semiconductor gas sensors is a very important indicator, because different gases may respond to semiconductor sensing materials, so it is difficult to separate the signals of different gases. Utilizing the principle of different sizes of different gases, by coating the surface of the sensing material with porous materials with different pore sizes as the shell layer, the gas whose molecular size is larger than the pore size of the shell layer can be selectively filtered, thereby realizing the selective recognition of small molecule gases . [0003] SnO 2 (Sensors and Actuators B:Chemical,1999,60,64-70), ZnO(Sensors and Actuators B:Chemical,2000,66,277-279), Co 3 o 4 (Advance...

Claims

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Application Information

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IPC IPC(8): B01J13/00C08G83/00G01N27/00
CPCB01J13/00C08G83/008G01N27/00
Inventor 季澎章伟田仁兵郑华张耿张绍强胡君刘敏霞李仪
Owner DONGGUAN UNIV OF TECH
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