| 초록 |
Plasmonic photocatalysts are receiving increasing attention due to their large absorption cross-section in the visible light. Even though conventional heterostructured plasmonic photocatalysts, which are composed of semiconductor and noble metal nanoparticles, i.e., Au/TiO2, have been shown to drive important chemical reactions, the mechanisms for photoexcited carrier harvesting have not been clearly elucidated, and the role of plasmonic nanoparticles has been limited as a light absorbing antenna. In our work, we accomplished a simple one-electron photochemical reaction using plasmonically excited Au nanoparticles in the absence of any supporting semiconductor. We found that the photocatalytic activity of Au nanoparticles arises from electron/hole pairs generated by interband transitions like a conventional metal oxide-based. We also found that a non-linear photon flux regime where multiple electron/hole pairs can be harvested and may be utilized for a multi-electron reactions. |
