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Issue 69, 2017, Issue in Progress
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Increasing local field by interfacial coupling in nanobowl arrays

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Abstract

An increased local field is crucial to create hotspots when applied in detections, which usually means the fabrication of nanostructure arrays with strong electromagnetic couplings. In this study, ordered monolayer Ag and Ag/SiO2/Ag sandwich nanobowls arrays with enhanced local field are fabricated by the combination of nanosphere self-assembly lithography (NSL) technology and layer-by-layer (LBL) film deposition. The isolated nanobowls and nanohole-like nanostructures composed of connected nanobowls can be obtained by tuning the sputtering film thickness and polystyrene (PS) microsphere size. The isolated nanobowl arrays show high local surface plasmon resonance (LSPR) and surface plasmon resonance (SPR), which result in SERS enhancement. Compared to the Ag nanobowl arrays, the dielectric SiO2 layer in Ag/SiO2/Ag sandwich nanobowls as a spacer layer enhances the SERS signals. And the new plasmon couplings between interior and exterior Ag layers through the thin SiO2 layer are implementated, in addition to the contributions of nanogaps in the adjacent nanobowls and the sharp edges of a single nanobowl. The finite-difference time-domain (FDTD) solution shows the field enhancement can be mainly attributed to the SPR of interparticles along the Ag–SiO2 interfaces. The simulation results and experimental analysis indicate the important contribution of the SiO2 layer to the enhanced SERS effects in Ag/SiO2/Ag sandwich nanobowl arrays.

Graphical abstract: Increasing local field by interfacial coupling in nanobowl arrays

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Supplementary files

Article information


Submitted
31 Aug 2017
Accepted
04 Sep 2017
First published
11 Sep 2017

This article is Open Access

RSC Adv., 2017,7, 43671-43680
Article type
Paper

Increasing local field by interfacial coupling in nanobowl arrays

H. Sun, L. Chen, Y. Wang, Z. Hua, Y. Liu, Y. Zhang and J. Yang, RSC Adv., 2017, 7, 43671
DOI: 10.1039/C7RA09690A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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