Nanoscale Dehydrogenation Observed by Tip-Enhanced Raman Spectroscopy
| Autor: | Norihiko Hayazawa, Yuji Kuwahara, Francesca Celine Catalan, Agung Setiadi, Megumi Akai-Kasaya, Songpol Chaunchaiyakul, Hideji Osuga, Akira Saito, Pawel Krukowski, Yousoo Kim |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Triple bond 01 natural sciences Spectral line 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry.chemical_compound General Energy Monolayer symbols Physical chemistry Molecule Density functional theory Dehydrogenation Physical and Theoretical Chemistry 0210 nano-technology Raman spectroscopy Benzene |
| Zdroj: | The Journal of Physical Chemistry C. 121:18162-18168 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.7b03352 |
| Popis: | This study shows evidence of nanoscale dehydrogenation occurring during tip-enhanced Raman spectroscopy (TERS) measurements. The near-field TERS spectra obtained locally on a self-assembled monolayer of 2,13-bis(aldehyde)[7]thiaheterohelicene molecules showed vibrational frequencies in good agreement with that predicted by density functional theory calculations, except for the L-mode at ∼2000 cm–1, which is ascribed to a C≡C triple bond, implying that the benzene rings had been dehydrogenated during the experiments. Using peak analysis, incorporated with the molecular adsorption orientation deduced from high-resolution STM imaging, we conclude that one side benzene ring protruding upward was dehydrogenated as a result of pyrolysis, with the Ag tip serving as both local heat source and catalyst. |
| Databáze: | OpenAIRE |
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