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Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)

A two-dimensional (2D) covalent monolayer based on [4 + 4] cycloaddition reactions between adjacent anthracene units was synthesized at an air/water interface. For structural analysis, tip-enhanced Raman spectroscopy (TERS) provides direct evidence for the covalent bonds formed between monomer molec...

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Detalles Bibliográficos
Autores principales: Zheng, Li-Qing, Servalli, Marco, Schlüter, A. Dieter, Zenobi, Renato
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6984395/
https://www.ncbi.nlm.nih.gov/pubmed/32055337
http://dx.doi.org/10.1039/c9sc03296g
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author Zheng, Li-Qing
Servalli, Marco
Schlüter, A. Dieter
Zenobi, Renato
author_facet Zheng, Li-Qing
Servalli, Marco
Schlüter, A. Dieter
Zenobi, Renato
author_sort Zheng, Li-Qing
collection PubMed
description A two-dimensional (2D) covalent monolayer based on [4 + 4] cycloaddition reactions between adjacent anthracene units was synthesized at an air/water interface. For structural analysis, tip-enhanced Raman spectroscopy (TERS) provides direct evidence for the covalent bonds formed between monomer molecules. For the first time, progress of the photopolymerization reaction was monitored by irradiation (λ = 385 nm) of the monomer monolayer for different times, based on averaged TER spectra extracted from maps. In addition, a 2D polymerization on a Au (111) substrate was realized, which opens up new possibilities for such chemical transformations. This work uses TERS as a minimally invasive tool to investigate how the reaction conditions affect polymerization conversion. We show that the high sensitivity and the high spatial resolution of TERS can be used to estimate the crystallinity of 2D covalent monolayers, which is a key question in polymer synthesis.
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spelling pubmed-69843952020-02-13 Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111) Zheng, Li-Qing Servalli, Marco Schlüter, A. Dieter Zenobi, Renato Chem Sci Chemistry A two-dimensional (2D) covalent monolayer based on [4 + 4] cycloaddition reactions between adjacent anthracene units was synthesized at an air/water interface. For structural analysis, tip-enhanced Raman spectroscopy (TERS) provides direct evidence for the covalent bonds formed between monomer molecules. For the first time, progress of the photopolymerization reaction was monitored by irradiation (λ = 385 nm) of the monomer monolayer for different times, based on averaged TER spectra extracted from maps. In addition, a 2D polymerization on a Au (111) substrate was realized, which opens up new possibilities for such chemical transformations. This work uses TERS as a minimally invasive tool to investigate how the reaction conditions affect polymerization conversion. We show that the high sensitivity and the high spatial resolution of TERS can be used to estimate the crystallinity of 2D covalent monolayers, which is a key question in polymer synthesis. Royal Society of Chemistry 2019-09-24 /pmc/articles/PMC6984395/ /pubmed/32055337 http://dx.doi.org/10.1039/c9sc03296g Text en This journal is © The Royal Society of Chemistry 2019 https://creativecommons.org/licenses/by-nc/3.0/This article is freely available. This article is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported Licence (CC BY-NC 3.0)
spellingShingle Chemistry
Zheng, Li-Qing
Servalli, Marco
Schlüter, A. Dieter
Zenobi, Renato
Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
title Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
title_full Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
title_fullStr Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
title_full_unstemmed Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
title_short Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
title_sort tip-enhanced raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on au (111)
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6984395/
https://www.ncbi.nlm.nih.gov/pubmed/32055337
http://dx.doi.org/10.1039/c9sc03296g
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