Method for preparing ZnO@ZIF-8 compound, ZnO@ZIF-8 compound and gas sensor

A gas-sensing sensor and compound technology, applied in instruments, scientific instruments, coatings, etc., can solve the problems of poor stability, low sensitivity, easy poisoning, etc., and achieve the effect of improving gas selectivity, stability and service life
CN109970355AInactive Publication Date: 2019-07-05CHONGQING UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV
Publication Date
2019-07-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

Provided is a method for preparing a ZnO@ZIF-8 compound. The method includes the steps that 1, a zinc acetatemethanol solution and a sodium hydroxidemethanol solution are mixed to obtain suspension liquid containing Zn(OH)2, and then a glass substrate is soaked in the suspension liquid containing Zn(OH)2 for 5 minutes; 2, the soaked glass substrate is taken out and then is subjected to annealing for 30 minutes at 350 DEG C; 3, a zinc nitrateaqueous solution and a hexamethylenetetramineaqueous solution are mixed to form a mixed solution; 4, the glass substrate processed in step 2 and the mixedsolution obtained in steps 3 are placed in a high-pressure reactor and are subjected to hydrothermal reaction at 100 DEG C, so that zinc oxide grows on the glass substrate ; 5, a mixed solution of N,N-dimethylformamide and deionized water is prepared, 2-methylimidazole is added, and the mixture is stirred to be uniform to form a mixed liquid; 6, the glass substrate in step 4 is placed into a linerof the reactor, the mixed liquid obtained in step 5 is poured into the liner, hydrothermal reaction is conducted at 80 DEG C for 3 hours so that ZIF-8 can grow on the surface of zinc oxide, and the ZnO@ZIF-8 compound is obtained.
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Description

technical field

[0001] The present invention relates to a method for preparing a ZnO@ZIF-8 compound, a ZnO@ZIF-8 compound and a gas sensor, especially a method for preparing a micron-sized capsule-like ZnO@ZIF-8 compound, the ZnO@ZIF-8 compound Object and gas sensors can be used in the field of electrical equipment insulation on-line monitoring and fault diagnosis. Background technique

[0002] Metal oxide semiconductor materials have the advantages of being sensitive to a variety of gases, low cost, and fast response, so they have become a research hotspot today. ZnO is one of the most representative metal oxides. Although pure zinc oxide is generally sensitive to a variety of gases, its response value is not high, its selectivity is poor, and its detection limit is low. Modified treatment.

[0003] Metal-organic frameworks (MOFs) are a class of crystalline porous materials with a periodic network structure formed by self-assembly of inorganic metal centers (metal ions or...

Claims

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