Core-Shell and Yolk-Shell Covalent Organic Framework Nanostructures with Size-Selective Permeability

Summary: Many methods exist for the synthesis of covalent organic frameworks (COFs), but precise morphology control allowing the tailoring of core-shell and yolk-shell nanostructures has been elusive, mainly due to poor control of the reaction-diffusion processes. Herein, we propose the precise regu...

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Bibliographic Details
Main Authors: Song Wang, Yuhao Yang, Pingwei Liu, Ziyang Zhang, Chi Zhang, Ao Chen, Olayemi Oluwatosin Ajao, Bo-Geng Li, Pierre Braunstein, Wen-Jun Wang
Format: Article
Language:English
Published: Elsevier 2020-06-01
Series:Cell Reports Physical Science
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Online Access:http://www.sciencedirect.com/science/article/pii/S2666386420300564
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Summary:Summary: Many methods exist for the synthesis of covalent organic frameworks (COFs), but precise morphology control allowing the tailoring of core-shell and yolk-shell nanostructures has been elusive, mainly due to poor control of the reaction-diffusion processes. Herein, we propose the precise regulation of the COF generation and decomposition rates and their relationship with the diffusion rate of COF species during the synthesis, which enables a successful preparation of core-shell, yolk-shell, hollow-spherical, and multiple yolk-shell COF structures with tunable sizes ranging from 200 to 1,400 nm. Formed COF structures can serve as nanoreactors or nanocontainers, with the shell layer providing molecular-size selectivity determined by the nanopore size demonstrated here using Suzuki coupling reactions with phenylboronic acid, which produce a size-cutoff efficiency for halogenated aromatics approaching 100%. The precise morphology design and control of COF particles and hybrids may help enhance application efficiencies and provide access to new functionalities for COF materials.
ISSN:2666-3864