Ultrathin ZIF-67 nanosheet and preparation method thereof

A ZIF-67, nanosheet technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of rare exploration of ZIF-67 nanomaterials, unfavorable material dispersion and film forming treatment, It is not conducive to large-scale preparation and other problems, and achieves the effects of low preparation cost, high repetition rate, and improved device performance and stability.

CN114163652AActive Publication Date: 2022-03-11SHANGHAI UNIV OF ENG SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-03-11

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Abstract

The invention relates to the technical field of ultrathin two-dimensional modified metal organic framework materials, in particular to an ultrathin ZIF-67 nanosheet and a preparation method thereof. Cobalt nitrate hexahydrate or cobalt chloride hexahydrate which is relatively low in price is used as a metal node of a frame structure as a cobalt source, dimethylimidazole is used as an organic ligand as a bracket of the frame, and absolute ethyl alcohol and N, N-dimethylformamide are used as solvents; and reacting for 30 minutes at room temperature, aging for 24 hours, and carrying out centrifugal cleaning and drying treatment to obtain the ultrathin ZIF-67 nanosheet. The ZIF-67 nanosheet prepared by the invention is of a two-dimensional lamellar structure, the size of the ZIF-67 nanosheet is 20-200nm, and the thickness of the ZIF-67 nanosheet is 5-10nm. Compared with the prior art, the invention has the advantages of low product reaction temperature, simple preparation process, low cost, large-scale synthesis, smaller product size, easier control, larger specific surface area, more active sites and the like.
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Description

technical field

[0001] The invention relates to the technical field of ultrathin two-dimensional modified metal organic framework materials, in particular to an ultrathin ZIF-67 nanosheet and a preparation method thereof. Background technique

[0002] ZIF-67 is composed of abundant and non-toxic carbon, cobalt, nitrogen, hydrogen and oxygen elements in the earth. It is an environmentally friendly porous material with a regular dodecahedron structure, which has two types of pores (pore diameter) evenly distributed About 0.34nm, 1.1nm), and has a large specific surface area (about 1500m 2 / g). Has good catalytic and gas separation properties. In addition, ZIF-67 nanosheet is also an n-type narrow bandgap semiconductor with a forbidden band width of 1.36-1.6eV, and has good carrier mobility and optical transmission properties. However, the current preparation of ZIF-67 is mainly concentrated in the three-dimensional larger size range (200nm-2μm). Although a uniform film can ...

Examples

preparation example Construction

[0040] The invention provides a room temperature preparation method of ultra-thin ZIF-67 nanosheets, comprising the following steps:

[0041] (1) dissolving the cobalt salt in a mixed solvent of absolute ethanol and N,N-dimethylformamide, and mixing to obtain a cobalt salt solution;

[0042] (2) Dissolving dimethylimidazole in a mixed solvent of absolute ethanol and N,N-dimethylformamide, and mixing to obtain a dimethylimidazole solution;

[0043] (3) adding the cobalt salt solution that step (1) obtains to the dimethylimidazole solution that step (2) obtains and reacting, standing and aging after the reaction, and post-processing to obtain ultra-thin ZIF-67 nanosheets;

[0044] The whole process is carried out at room temperature.

[0045] In one embodiment of the present invention, in step (1), the cobalt salt is selected from one or more of cobalt nitrate hexahydrate or cobalt chloride hexahydrate.

[0046] In one embodiment of the present invention, in step (1), the volu...

Embodiment 1

[0063] This embodiment provides a method for preparing ultrathin ZIF-67 nanosheets at room temperature.

[0064] (1) At room temperature, 4mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in a mixed solvent composed of absolute ethanol and N,N-dimethylformamide with a volume ratio of 1:1 (each 60ml), and kept stirring for 10 minutes under the condition of a magnetic stirring speed of 500rpm / min. Homogenize to obtain cobalt nitrate solution.

[0065] (2) At room temperature, dissolve 16mmol dimethylimidazole in a mixed solvent composed of absolute ethanol and N,N-dimethylformamide with a volume ratio of 1:1 (60ml each), and stir at a magnetic stirring speed of 500rpm Under the condition of / min, the stirring was continued for 10 minutes, and the dimethylimidazole solution was obtained after mixing.

[0066] (3) The cobalt nitrate solution obtained in step (1) is quickly added to the dimethylimidazole solution obtained in step (2) to react, and the magnetic stirring speed is accelerat...

Embodiment 2

[0071] This embodiment provides a method for preparing ultrathin ZIF-67 nanosheets at room temperature.

[0072] (1) At room temperature, 4mmol CoCl 2 ·6H 2 O was dissolved in a mixed solvent composed of absolute ethanol and N,N-dimethylformamide with a volume ratio of 1:1 (each 60ml), and kept stirring for 10 minutes under the condition of a magnetic stirring speed of 500rpm / min. Obtain cobalt chloride solution after homogenization.

[0073] (2) At room temperature, dissolve 16mmol dimethylimidazole in a mixed solvent composed of absolute ethanol and N,N-dimethylformamide with a volume ratio of 1:1 (60ml each), and stir at a magnetic stirring speed of 500rpm Under the condition of / min, the stirring was continued for 10 minutes, and the dimethylimidazole solution was obtained after mixing.

[0074] (3) The cobalt chloride solution obtained in step (1) is quickly added to the dimethylimidazole solution obtained in step (2) to react, and the magnetic stirring speed is accele...