Tip-enhanced Raman spectroscopy for structural analysis of two-dimensional covalent monolayers synthesized on water and on Au (111)
| Autor: | Renato Zenobi, Li-Qing Zheng, A. Dieter Schlüter, Marco Servalli |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science 010405 organic chemistry food and beverages General Chemistry Polymer 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences 3. Good health Chemistry chemistry.chemical_compound symbols.namesake Monomer Photopolymer chemistry Polymerization Covalent bond Monolayer symbols Molecule Raman spectroscopy |
| Zdroj: | Chemical Science, 10 (42) Chemical Science |
| ISSN: | 2041-6539 2041-6520 |
| DOI: | 10.1039/c9sc03296g |
| Popis: | Two-dimensional covalent monolayers synthesized at an air/water interface were structurally analyzed by tip-enhanced Raman spectroscopy (TERS). Finally, on-metal surface synthesis of a 2D polymer was demonstrated under ambient conditions. 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. |
| Databáze: | OpenAIRE |
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