Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/79535
Title: Ordered array of metal particles on semishell separated with ultrathin oxide : fabrication and SERS properties
Authors: Li, Xianglin
Wang, Zhiwei
Shen, Zexiang
Tan, Chiew Kei
Tok, Alfred Iing Yoong
Keywords: Surface Plasmonic
DRNTU::Engineering::Materials
Surface-enhanced Raman Scattering
Issue Date: 2019
Source: Li, X., Wang, Z., Tan, C. K., Shen, Z., & Tok, A. I. Y. (2019). Ordered array of metal particles on semishell separated with ultrathin oxide : fabrication and SERS properties. Coatings, 9(1), 20-. doi:10.3390/coatings9010020
Series/Report no.: Coatings
Abstract: 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.
URI: https://hdl.handle.net/10356/79535
http://hdl.handle.net/10220/49054
ISSN: 2079-6412
DOI: http://dx.doi.org/10.3390/coatings9010020
Rights: © 2018 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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