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Ordered Array of Metal Particles on Semishell Separated with Ultrathin Oxide: Fabrication and SERS Properties

1
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
2
College of Education Science, Hunan First Normal University, No.1015, Fenglin Road (the 3rd), Yuelu District, Changsha 410205, China
3
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(1), 20; https://doi.org/10.3390/coatings9010020
Received: 22 October 2018 / Revised: 14 December 2018 / Accepted: 14 December 2018 / Published: 29 December 2018
(This article belongs to the Special Issue Advanced Surface Coating of Nanoparticles)
Metal particles in gap cavities provide an interesting system to achieve hybrid local surface plasmon modes for local field enhancement. Here, we demonstrate a relatively simple method to fabricate Ag nanoparticles positioned on Ag semishells separated by a thin (~5 nm) dielectric layer. The obtained structure can provide strong local electric field enhancement for surface-enhanced Raman scattering (SERS). The fabrication of the ordered array structure was realized by nanosphere self-assembly, atomic layer deposition, and metal thin-film dewetting. Numerical simulation proved that, compared to the conventional metal semishell arrays, the additional Ag particles introduce extra hot spots particularly in the valley regions between adjacent Ag semishells. As a result, the SERS enhancement factor of the metal semishell-based plasmonic structure could be further improved by an order of magnitude. The developed novel plasmonic structure also shows good potential for application in plasmon-enhanced solar water-splitting devices. View Full-Text
Keywords: surface-enhanced Raman scattering (SERS); surface plasmonic; nanosphere lithography; particle in cavity; monolayer self-assembly surface-enhanced Raman scattering (SERS); surface plasmonic; nanosphere lithography; particle in cavity; monolayer self-assembly
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MDPI and ACS Style

Li, X.; Wang, Z.; Tan, C.K.; Shen, Z.; Tok, A.I.Y. Ordered Array of Metal Particles on Semishell Separated with Ultrathin Oxide: Fabrication and SERS Properties. Coatings 2019, 9, 20.

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