Zeolitic Imidazolate Framework/Graphene Oxide Hybrid Nanosheets as Seeds for the Growth of Ultrathin Molecular Sieving Membranes

A defect‐free zeolitic imidazolate framework‐8 (ZIF‐8)/graphene oxide (GO) membrane with a thickness of 100 nm was prepared using two‐dimensional (2D) ZIF‐8/GO hybrid nanosheets as seeds. Hybrid nanosheets with a suitable amount of ZIF‐8 nanocrystals were essential for producing a uniform seeding la...

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Bibliographic Details
Published in:Angewandte Chemie (International ed.) 2016-02, Vol.55 (6), p.2048-2052
Main Authors: Hu, Yaoxin, Wei, Jing, Liang, Yan, Zhang, Huacheng, Zhang, Xiwang, Shen, Wei, Wang, Huanting
Format: Article
Language:English
Subjects:
Carbon dioxide
Crystal defects
Crystal growth
Crystals
Diffusion
Fabrication
Gas separation
Graphene
graphene oxide
Membranes
Metal-organic frameworks
Nanocrystals
Nanosheets
Seeds
Selectivity
Zeolites
zeolitic-imidazolate frameworks
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Summary:A defect‐free zeolitic imidazolate framework‐8 (ZIF‐8)/graphene oxide (GO) membrane with a thickness of 100 nm was prepared using two‐dimensional (2D) ZIF‐8/GO hybrid nanosheets as seeds. Hybrid nanosheets with a suitable amount of ZIF‐8 nanocrystals were essential for producing a uniform seeding layer that facilitates fast crystal intergrowth during membrane formation. Moreover, the seeding layer acts as a barrier between two different synthesis solutions, and self‐limits crystal growth and effectively eliminates defects during the contra‐diffusion process. The resulting ultrathin membranes show excellent molecular sieving gas separation properties, such as with a high CO2/N2 selectivity of 7.0. This 2D nano‐hybrid seeding strategy can be readily extended to the fabrication of other defect‐free and ultrathin MOF or zeolite molecular sieving membranes for a wide range of separation applications. Thin sieves: Zeolitic imidazolate framework‐8 (ZIF‐8)/graphene oxide (GO) membrane with a thickness of 100 nm was prepared using 2D ZIF‐8/GO hybrid nanosheets as seeds. The nanohybrid seeding facilitates uniform crystallization of ZIF‐8 on the porous substrate, and the GO promotes crystal intergrowth, leading to high‐quality molecular sieving membranes.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201509213