Journal
NANOPHOTONICS
Volume 11, Issue 1, Pages 33-44Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0476
Keywords
hat-shaped nanostructures; SERS; surfacecatalyticreaction
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Funding
- National Natural Science Foundation of China (NSFC) [12004226, 12174229, 11804200, 11904214]
- Natural Science Foundation of Shandong Province [ZR2020QA075]
- Shandong Post-Doctoral Innovation Project [202002021]
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Regulation of hot spots using hat-shaped hierarchical nanostructures shows promising potential in various applications, including SERS and plasmon-driven catalysis. The constructed platform, with narrow gaps produced by MoS2 films and curvature of space, exhibits superior SERS capability and achieves ultrasensitive detection, as well as real-time monitoring of catalytic conversion.
Regulation of hot spots exhibits excellent potential in many applications including nanolasers, energy harvesting, sensing, and subwavelength imaging. Here, hat-shaped hierarchical nanostructures with different space curvatures have been proposed to enhance hot spots for facilitating surface-enhanced Raman scattering (SERS) and plasmon-driven catalysis applications. These novel nanostructures comprise two layers of metal nanoparticles separated by hat-shaped MoS2 films. The fabrication of this hybrid structure is based on the thermal annealing and thermal evaporation of self-assembled polystyrene spheres, which are convenient to control the metal particle size and the curvature of hat-shaped nanostructures. Based on the narrow gaps produced by the MoS2 films and the curvature of space, the constructed platform exhibits superior SERS capability and achieves ultrasensitive detection for toxic molecules. Furthermore, the surface catalytic conversion of p-nitrothiophenol (PNTP) to p, p'-dimercaptobenzene (DMAB) was in situ monitored by the SERS substrate. The mechanism governing this regulation of hot spots is also investigated via theoretical simulations.
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