Controlling Photocatalytic Reactions and Hot Electron Transfer by Rationally Designing Pore Sizes and Encapsulated Plasmonic Nanoparticle Numbers
- Authors
- Nam, N.N.; Bui, T.L.; Ho, N.T.; Son, S.J.; Joo, S.-W.
- Issue Date
- Sep-2019
- Publisher
- American Chemical Society
- Citation
- Journal of Physical Chemistry C, v.123, no.38
- Journal Title
- Journal of Physical Chemistry C
- Volume
- 123
- Number
- 38
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/35204
- DOI
- 10.1021/acs.jpcc.9b05737
- ISSN
- 1932-7447
- Abstract
- Controlled self-assembly of different numbers of gold nanoparticles (AuNPs) in the highly ordered cylindrical anodic aluminum oxide nanopores was achieved by a facile ultrasonication method. The surface plasmon resonance bands became red-shifted by increasing the number of nanoparticles (N), in the top view, from monomer M1 (N = 1) to multimers of M2 (N = 3 ± 1), M3 (N = 5 ± 1), and M4 (N = 7 ± 1). The numerical calculations of the M2 model showed the best match of 2 nm nanogap among 28 nm diameter AuNPs in 53 nm diameter nanopores. When the number of AuNPs inside the nanopores increased, more hotspots were generated, which induced the plasmon-driven photocatalysis on AuNP clusters at the incident visible light of 633 nm. The enhanced photocatalytic reaction of 4-nitrobenzenethiol was observed after sequentially increasing the number of AuNPs, which began at M3 and was maximum for M4. The M3 configuration could be a magical number of AuNP clusters for the nanogap-induced photocatalysis under 633 nm irradiation (-0.2 mW) for 12 min. Our methods should be helpful in adjusting photocatalysis by varying the numbers of nanoparticles inside the tunable nanopores. © 2019 American Chemical Society.
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