Enriching and Quantifying Porous Single Layer 2D Polymers by Exfoliation of Chemically Modified van der Waals Crystals

Autor: Ute Kaiser, Gregor Hofer, A. Dieter Schlüter, Annemarie Pucci, Baokun Liang, Claudia Backes, Niklas Huber, Kevin Synnatschke, Christian W. Huck, Ralph Z. Lange, Haoyuan Qi
Rok vydání: 2020
Předmět:
Zdroj: Angewandte Chemie (International Ed. in English)
Angewandte Chemie. International Edition, 59 (14)
ISSN: 1521-3757
0044-8249
1433-7851
1521-3773
0570-0833
DOI: 10.1002/ange.201912705
Popis: 2D polymer sheets with six positively charged pyrylium groups at each pore edge in a stacked single crystal can be transformed into a 2D polymer with six pyridines per pore by exposure to gaseous ammonia. This reaction furnishes still a crystalline material with tunable protonation degree at regular nano‐sized pores promising as separation membrane. The exfoliation is compared for both 2D polymers with the latter being superior. Its liquid phase exfoliation yields nanosheet dispersions, which can be size‐selected using centrifugation cascades. Monolayer contents of ≈30 % are achieved with ≈130 nm sized sheets in mg quantities, corresponding to tens of trillions of monolayers. Quantification of nanosheet sizes, layer number and mass shows that this exfoliation is comparable to graphite. Thus, we expect that recent advances in exfoliation of graphite or inorganic crystals (e.g. scale‐up, printing etc.) can be directly applied to this 2D polymer as well as to covalent organic frameworks.
Angewandte Chemie. International Edition, 59 (14)
ISSN:1433-7851
ISSN:1521-3773
ISSN:0570-0833
Databáze: OpenAIRE
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