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Nanoparticle Size‐Fractionation through Self‐Standing Porous Covalent Organic Framework Films
Author(s) -
Dey Kaushik,
Kunjattu H. Shebeeb,
Chahande Anurag M.,
Banerjee Rahul
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201912381
Subject(s) - materials science , porosity , nanoparticle , nanotechnology , microcrystalline , covalent bond , chemical engineering , covalent organic framework , membrane , annealing (glass) , fabrication , micrometer , organic chemistry , chemistry , composite material , crystallography , medicine , biochemistry , alternative medicine , physics , optics , pathology , engineering
Covalent organic frameworks (COFs) have attracted attention due to their ordered pores leading to important industrial applications like storage and separation. Combined with their modular synthesis and pore engineering, COFs could become ideal candidates for nanoseparations. However, the fabrication of these microcrystalline powders as continuous, crack‐free, robust films remains a challenge. Herein, we report a simple, slow annealing strategy to construct centimeter‐scale COF films ( Tp‐Azo and Tp‐TTA ) with micrometer thickness. The as‐synthesized films are porous (SA BET =2033 m 2 g −1 for Tp‐Azo ) and chemically stable. These COFs have distinct size cut‐offs (ca. 2.7 and ca. 1.6 nm for Tp‐Azo and Tp‐TTA , respectively), which allow the size‐selective separation of gold nanoparticles. Unlike, other conventional membranes, the durable structure of the COF films allow for excellent recyclability (up to 4 consecutive cycles) and easy recovery of the gold nanoparticles from the solution.