KIP publications

year 2019
author(s) Ralph Z. Lange, Kevin Synnatschke, Haoyuan Qi, Niklas Huber, Gregor Hofer, Baokun Liang, Christian Huck, Annemarie Pucci, Ute Kaiser, Claudia Backes, A. Dieter Schlüter
title Enriching and quantifying porous single layer 2D polymers by exfoliation of chemically modified van der Waals crystals
KIP-Nummer HD-KIP 19-106
KIP-Gruppe(n) F6
document type Paper
Keywords polymers, layered compounds, monolayers, postpolymerisation modification, liquid phase exfoliation
source Angewandte Chemie (2019) online
doi 10.1002/ange.201912705
Abstract (en)

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 the 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 10s 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.

  author   = {Lange, Ralph Z. and Synnatschke, Kevin and Qi, Haoyuan and Huber, Niklas and Hofer, Gregor and Liang, Baokun and Huck, Christian and Pucci, Annemarie and Kaiser, Ute and Backes, Claudia and Schl\"uter, A. Dieter},
  title    = {Enriching and quantifying porous single layer 2D polymers by exfoliation of chemically modified van der Waals crystals},
  journal  = {Angewandte Chemie},
  year     = {2019},
  volume   = {},
  number   = {},
  pages    = {},
  month    = {December},
  doi      = {10.1002/ange.201912705},
  url      = {}
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