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.

Active Publication Date: 2022-03-11
SHANGHAI UNIV OF ENG SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in 2017, Huang Liang et al. used sodium chloride solution templates to assist the growth of ultrathin ZIF-67 nanosheets (J. Mater. Chem. A, 2017, 5, 18610–18617), but the process is relatively complicated. It is not conducive to large-scale preparation; in 2018, Guijuan Wei et al. used a mixed solvent of water and DMF to prepare ultrathin ZIF-67 nanosheets (ACS Appl.Mater.Interfaces 2018, 10, 23721-23730), but The ZIF-67 nanosheets prepared by it are still in the micron scale, and the size is uneven, which is not conducive to the good dispersion and film-forming treatment of the material again.
[0004] It can be found that the synthesis of ZIF-67 nanomaterials with better dispersion, smaller size and uniform size using conventional single solvent or mixed solvent with high polarity is still seldom explored. By adjusting the type of mixed solvent and the concentration of reactants to There are few reports on adjusting the size of ZIF-67 nanosheets

Method used

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  • Ultrathin ZIF-67 nanosheet and preparation method thereof
  • Ultrathin ZIF-67 nanosheet and preparation method thereof
  • Ultrathin ZIF-67 nanosheet and preparation method thereof

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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...

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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.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B82Y30/00B82Y40/00
CPCC08G83/008B82Y30/00B82Y40/00
Inventor 芮一川金作明徐雨田石江珊王晓洁
Owner SHANGHAI UNIV OF ENG SCI
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