Journal
NANOPHOTONICS
Volume 9, Issue 16, Pages 4761-4773Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0454
Keywords
hydrophobic; multiscale cavities; self-cleaning; SERS sensing
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Funding
- National Natural Science Foundation of China [11804200, 11974222, 11904214, 11774208]
- Taishan Scholars Program of Shandong Province [tsqn201812104]
- Qingchuang Science and Technology Plan of Shandon Qingchuang Science and Technology Plan of Shandong Province [2019KJJ014, 2019KJJ017]
- Project of Shandong Province Higher Educational Science and Technology Program [J18KZ011]
- China Postdoctoral Science Foundation [2019M662423]
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Cavity array, with excellent optical capture capability, has received increasing attention for the surface-enhanced Raman spectroscopy (SERS)-active substrates. Here, we proposed molybdenum disulfide (MoS2) nanocavities growing on pyramid Si (PSi) composed of in situ reduced Au nanoparticles (AuNPs), which can form the multiscale cavities (MSCs), and is facile for the couple of the plasmon. We demonstrated that the PSi/MoS2/Au MSCs can serve as highly sensitive, uniform, and stable SERS substrates for rhodamine 6G (R6G), crystal violet, and adenosine triphosphate detection, benefiting from the synergistic effect of the enhanced light trapping and the effective plasmonic couple. The couple of the plasmon in the MSCs is evidently proved by finitedifference time domain simulation, showing the strong electromagnetic field is located around the cavity wall. Moreover, the excellent hydrophobicity of the PSi/MoS2/AuNPs substrate endows it with the ability for the directional monitoring of organic pollutant in a mixture of oil and water. Finally, we demonstrated the MSCs with outstanding photocatalytic performance could achieve the renewable utilization by self-cleaning, which was attributed to the fast electron transfer and effective light absorption. The proposed PSi/MoS2/AuNPs MSC represents a robust mean using the plasmonic metal/semiconductor heterostructure for high-performance SERS sensors and photodegradation.
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