Journal
ACS NANO
Volume 17, Issue 23, Pages 23784-23793Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.3c07743
Keywords
covalent organic frameworks; polymers; two-dimensionalmaterials; nanosheets; molecular separation
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This study reports an effective strategy to accurately control the growth of covalent organic framework (COF) nanosheets. By using a specific polymer to manipulate the growth of COF nanosheets, molecularly thin but thickness-controllable nanosheets are obtained for the preparation of molecular separation membranes.
Nanosheets derived from two-dimensional covalent organic frameworks (2D COFs) are increasingly desirable in various fields. While breakthroughs in the chemical and physical delamination of 2D COFs are rising, precisely regulating the growth of the COF nanosheets has not been realized yet. Herein, we report an effective strategy of polymer-manipulated crystallization to accurately control the growth of COF nanosheets. Chemically asymmetric polyvinylpyrrolidone (PVP) is developed as the manipulator that selectively interacts with the aldehydes and (100) facet to induce anisotropic growth of COFs. The number of PVP constitutional units determines this specific interaction, leading to molecularly thin but thickness-controllable nanosheets with excellent dispersity. We process these nanosheets into robust A4-sized membranes for ultraselective molecular separation. The membrane intercalated with long-chain PVP demonstrates largely improved performance, surpassing the reported COF membranes. This work reports a strategy for anisotropically crystallizing 2D COFs to yield processable nanosheets toward practical applications.
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