期刊
OPTICAL MATERIALS
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2021.110847
关键词
Plasmonics; Visible-light; Titanium-oxides; Nanocomposite; Metamaterials; Plasmonic chemistry
资金
- China Scholarship Council (CSC) [201506930002]
- Norwegian Micro- and Nano- Fabrication Facility (NorFab) [245963/F50]
- EEA-Poland [NOR/POLNORCCS/PhotoRed/0007/201900]
In this study, a significant resonant visible absorption was discovered in metal-oxides, induced by plasmons, which effectively enhanced the transfer of photogenerated charge carriers. This breakthrough not only advances titanium-oxides nanocomposites towards plasmonic chemistry in the visible-light region, but also highlights a potential general route to harnessing photons beyond the bandgap limitation based on plasmonic metal-oxides nanocomposites.
The efficient utilization of visible light on wide-bandgap metal-oxides is a long-term goal but is still a grand challenge for plasmon-driven chemistry. The plasmon-induced concentration of photons in adjacent materials provides a strategic pathway to extend the light-harvesting regime to sub-bandgap. With the abundant edge-spots in surface nanostructures, here, we report that the titanium-oxides nanocomposites composed of the metallic titanium coupled with its oxides exhibit significant resonant visible absorption. The experimental character-izations with computational analyses demonstrate that the excited plasmon resonance at edge-interfaces results in the unique visible absorption band. Localized field-enhancement, charge-scattering, and hot-electrons effects conclusively confirm that the visible absorption is derived from the plasmon resonance, rather than the nar-rowing of bandgap or energy levels of impurities or defects. The plasmon-induced absorption effectively en-hances the separation and transfer of photogenerated charge carriers leading to improved photoactivity. Our results help to advance titanium-oxides nanocomposites towards plasmonic chemistry in the visible-light region and highlight a potential general route to harnessing photons beyond the bandgap limitation based on plasmonic metal-oxides nanocomposites.
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