期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 48, 页码 53724-53735出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c14554
关键词
amine coupling; gold nanobipyramids; heterostructures; plasmon resonance; plasmonic photocatalysis
资金
- Natural Science Foundation of China
- Special Fund Project of Zhengzhou Basic and Applied Basic Research
- Chinese University of Hong Kong
- [51702114]
- [2018GGJS178]
- [ZZSZX202001]
- [ZZSZX202002]
- [4053468]
This study presents a facile method for synthesizing TiO2-tipped Au nanobipyramids (NBPs) to create (Au NBP)/t-TiO2 nanodumbbells, which exhibit enhanced photocatalytic activity through photo-reduction and photo-oxidation processes. The effect of plasmonic hotspots on the enhancement of photocatalytic activity is confirmed by both experimental and simulation results.
Designing plasmonic photocatalysts with spatially controlled catalytic sites is an effective strategy to boost the sunlight-driven chemical transformation efficiency through plasmonic enhance-ment. Herein, we describe a facile method for the synthesis of TiO2- tipped Au nanobipyramids (NBPs) to give (Au NBP)/t-TiO2 nanodumbbells. The surfactant cetyltrimethylammonium bromide concentration is the key factor in the construction of this type of unique nanostructure. The photocatalytic aerobic oxidative coupling of amines using the plasmonic photocatalysts with the dumbbell-like and core@shell structures indicates that the TiO2-tipped ends for the photo-reduction and the exposed adjacent Au surface for the photo-oxidation on (Au NBP)/t-TiO2 can significantly improve the photocatalytic activity. The underlying mechanism of the photo-catalytic oxidative coupling of benzylamine over (Au NBP)/t-TiO2 has been thoroughly investigated. Both experimental and simulation results for (Au NBP)/t-TiO2 and (Au nanorod)/t-TiO2 confirm the important effect of the plasmonic hotspots on the enhancement of the photocatalytic activity.
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