Plasmon-Enhanced Autocatalytic N-Demethylation
| Autor: | Tefera E. Tesema, Terefe G. Habteyes, Christopher J. Annesley |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Thionine 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Autocatalysis symbols.namesake chemistry.chemical_compound General Energy Adsorption chemistry Operando spectroscopy Colloidal gold Yield (chemistry) symbols Physical and Theoretical Chemistry 0210 nano-technology Raman scattering Plasmon |
| Zdroj: | The Journal of Physical Chemistry C. 122:19831-19841 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.8b07078 |
| Popis: | Increasing experimental results indicate that optically excited plasmonic metal nanoparticles can drive photochemical reactions at photon flux comparable to that of solar radiation. However, experimental evidence that provides insight into the mechanism of the reactions on plasmonic surfaces has been limited. Here, using plasmon-enhanced N-demethylation (PEND) of methylene blue (MB) as model reaction, we report mechanistic analysis of photochemical reactions on plasmonic gold nanoparticles under different adsorption and atmospheric conditions using surface-enhanced Raman scattering as operando spectroscopy to monitor the reaction as a function of exposure time to the light source. We found that in air and oxygen atmospheres and in the presence of co-adsorbed water molecules, MB undergoes photochemical N-demethylation to yield thionine (complete N-demethylation product) and other partial N-demethylation products that have distinct vibrational signatures. The product signals are negligible when the MB-parti... |
| Databáze: | OpenAIRE |
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