Plasmonic Switching: Hole Transfer Opens an Electron-Transfer Channel in Plasmon-Driven Reactions
- Authors
- Lee, Dokyung; Yoon, Sangwoon
- Issue Date
- Jul-2020
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, v.124, no.29, pp 15879 - 15885
- Pages
- 7
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- Volume
- 124
- Number
- 29
- Start Page
- 15879
- End Page
- 15885
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/53567
- DOI
- 10.1021/acs.jpcc.0c03040
- ISSN
- 1932-7447
1932-7455
- Abstract
- Plasmon excitation and decay in gold nanoparticles (AuNPs) generates hot charge carriers that transfer to surface molecules and cause chemical transformation. We reveal that both electron- and hole-transfer channels must be open for reactions to occur. Furthermore, electron-transfer reactions can be switched on or off by a hole-transfer reaction. The reduction of 4-nitrobenzenethiol (NBT) to 4,4'-dimercaptoazobenzene (DMAB) via electron transfer from AuNPs to NBT does not occur in nanogaps between AuNPs and Au films with NBT alone. However, DMAB appears when NBT is mixed with 4-mercaptobenzoic acid (MBA), which undergoes decarboxylation by plasmoninduced hole transfer. The electron-transfer reaction yield is linearly correlated with the hole-transfer reaction yield. In contrast, when pairing NBT with molecules that are unreactive to plasmon excitation, electron transfer to NBT does not occur. Balancing the transfer of charge acts as a plasmonic switch for reaction pathways.
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