Journal
ACS NANO
Volume 14, Issue 10, Pages 13876-13885Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c06278
Keywords
surface plasmon resonance; whispering gallery mode; Escherichia coli; hot spots; photocatalysis; hydrogen production
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Funding
- National Natural Science Foundation of China [51802115, 11904131, 51872128]
- Natural Science Foundation of Shandong Province [ZR2018BEM010, ZR2019YQ21]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZC0842, ZR2018ZC0843]
- Scientific and Technology Project of University of Jinan [XKY1923]
- Fonds de Recherche du Quebec Nature et Technologies (FRQNT)
- Natural Sciences and Engineering Research Council of Canada (NSERC), CREATE: Guided Light
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The TiO2/Au nanostructure has been acknowledged as one of the most classic visible-light active photocatalysts due to the surface plasmon resonance (SPR) of Au nanoparticles. In many cases, the SPR effect only features weak visible light absorption in conventional TiO2/Au nanostructures. Here, we demonstrate a design of TiO2/Au/TiO2 with a combination of whispering gallery mode (WGM) resonances and SPR for efficient visible-light-driven photocatalysis. Escherichia coli (E. coli) were used as natural reactants as well as a template to construct an E. coli-like TiO2/Au/TiO2 nanostructure. Using numerical simulations, we show that the E. coli-like TiO2 capsule acts as the WGM resonator to interplay with the SPR effect of the Au NPs on Ti(O)2 surface, which leads to a significant increase of visible light absorption and the local field enhancement at the Au-TiO2 interface. Accordingly, with the synergistic effect of WGM and SPR, the E. coli-like TiO2/Au/TiO2 nanostructure exhibits enhanced photocatalytic activity in the visible range. Our work reveals a promising bioapproach to a design highly visible light active plasmonic photocatalyst.
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