| Structural elucidation of 2D polymer monolayers proving long-range order is a challenge that limits the pace in which this recent field of polymer chemistry and of synthetic 2D materials develops. To overcome this bottleneck, we here present a method in which tip-enhanced Raman spectroscopy is combined with a random growth crystallization model to obtain global features from local spectroscopic information. Concretely, we prove the nature and determine the conversion number X of the cross-links for two new 2D homopolymers and one (of three) new 2D copolymers. Assuming random and in-plane growth, our model results in crystallinity degrees of 93.1% to 99.7% and mean radii of defect-free crystalline areas of 3.15 nm for conversion numbers of 84% < X < 98%. Thus, we provide strong evidence for the synthetic monolayer 2D materials presented that they qualify as 2D polymers and are therefore perfectly suited for indepth studies both in a more fundamental direction as well as toward application. This example shows how our method can affect current research on covalent sheets.
for LaTeX users @article{WWang2019-141,
author = {W. Wang and F. Shao and M. Kr\"oger and R. Zenobi and A. D. Schl\"uter},
title = {Structure elucidation of 2D polymer monolayers based on crystallization estimates derived from tip-enhanced Raman spectroscopy (TERS) polymerization conversion data},
journal = {J. Amer. Chem. Soc.},
volume = {141},
pages = {9867-9871},
year = {2019}
}
\bibitem{WWang2019-141} W. Wang, F. Shao, M. Kr\"oger, R. Zenobi, A.D. Schl\"uter,
Structure elucidation of 2D polymer monolayers based on crystallization estimates derived from tip-enhanced Raman spectroscopy (TERS) polymerization conversion data,
J. Amer. Chem. Soc. {\bf 141} (2019) 9867-9871.WWang2019-141
W. Wang, F. Shao, M. Kr\"oger, R. Zenobi, A.D. Schl\"uter
Structure elucidation of 2D polymer monolayers based on crystallization estimates derived from tip-enhanced Raman spectroscopy (TERS) polymerization conversion data
J. Amer. Chem. Soc.,141,2019,9867-9871 |
mk@mat.ethz.ch
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