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

被引:33
作者
Lange, Ralph Z. [1 ]
Synnatschke, Kevin [2 ]
Qi, Haoyuan [3 ]
Huber, Niklas [1 ]
Hofer, Gregor [1 ,4 ]
Liang, Baokun [3 ]
Huck, Christian [5 ]
Pucci, Annemarie [5 ]
Kaiser, Ute [3 ]
Backes, Claudia [2 ]
Schlueter, A. Dieter [1 ,2 ]
机构
[1] Swiss Fed Inst Technol, Inst Polymers, Vladimir Prelog Weg 5, Zurich, Switzerland
[2] Heidelberg Univ, Inst Phys Chem, Neuenheimer Feld 253, D-69120 Heidelberg, Germany
[3] Ulm Univ, Cent Facil Electron Microscopy, Electron Microscopy Grp Mat Sci, Albert Einstein Allee 11, D-89081 Ulm, Germany
[4] Swiss Fed Inst Technol, Dept Mat, Xray Platform D MATL, Vladimir Prelog Weg 5, CH-8093 Zurich, Switzerland
[5] Heidelberg Univ, Kirchhoff Inst Phys, Neuenheimer Feld 227, D-69120 Heidelberg, Germany
基金
瑞士国家科学基金会;
关键词
layered compounds; liquid phase exfoliation; monolayers; polymers; post-polymerization modification; LIQUID-PHASE EXFOLIATION; SOLVENT EXFOLIATION; DOUBLE HYDROXIDE; GRAPHENE; NANOSHEETS; GRAPHITE; DELAMINATION; DISPERSIONS; CHEMISTRY; THICKNESS;
D O I
10.1002/anie.201912705
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 approximate to 30 % are achieved with approximate to 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.
引用
收藏
页码:5683 / 5695
页数:13
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