Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering

We report the tuning of localized surface plasmon resonance (LSPR) of nanoporous gold (NPG) by silica coating, which also affects the surface enhanced Raman scattering (SERS) of NPG. In this study, controllable silica shell is assembled on the NPG surface, and a fully silica thin layer causes more t...

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Detalles Bibliográficos
Autores principales: Li, Wei, Ma, Chao, Zhang, Ling, Chen, Bin, Chen, Luyang, Zeng, Heping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410204/
https://www.ncbi.nlm.nih.gov/pubmed/30759881
http://dx.doi.org/10.3390/nano9020251
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author Li, Wei
Ma, Chao
Zhang, Ling
Chen, Bin
Chen, Luyang
Zeng, Heping
author_facet Li, Wei
Ma, Chao
Zhang, Ling
Chen, Bin
Chen, Luyang
Zeng, Heping
author_sort Li, Wei
collection PubMed
description We report the tuning of localized surface plasmon resonance (LSPR) of nanoporous gold (NPG) by silica coating, which also affects the surface enhanced Raman scattering (SERS) of NPG. In this study, controllable silica shell is assembled on the NPG surface, and a fully silica thin layer causes more than 50 nm red-shift of LSPR band due to dielectric medium dependence. Additionally, ~1 nm silica coated NPG film shows excellent SERS enhancement, which is due to electromagnetic coupling between ligaments and local surface plasmon field enhancement within pores, and theoretical analysis indicates that silica coating further improves the coupling effect, which demonstrates the electromagnetic origin of the tuning of SERS effect.
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spelling pubmed-64102042019-03-11 Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering Li, Wei Ma, Chao Zhang, Ling Chen, Bin Chen, Luyang Zeng, Heping Nanomaterials (Basel) Article We report the tuning of localized surface plasmon resonance (LSPR) of nanoporous gold (NPG) by silica coating, which also affects the surface enhanced Raman scattering (SERS) of NPG. In this study, controllable silica shell is assembled on the NPG surface, and a fully silica thin layer causes more than 50 nm red-shift of LSPR band due to dielectric medium dependence. Additionally, ~1 nm silica coated NPG film shows excellent SERS enhancement, which is due to electromagnetic coupling between ligaments and local surface plasmon field enhancement within pores, and theoretical analysis indicates that silica coating further improves the coupling effect, which demonstrates the electromagnetic origin of the tuning of SERS effect. MDPI 2019-02-12 /pmc/articles/PMC6410204/ /pubmed/30759881 http://dx.doi.org/10.3390/nano9020251 Text en © 2019 by 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/).
spellingShingle Article
Li, Wei
Ma, Chao
Zhang, Ling
Chen, Bin
Chen, Luyang
Zeng, Heping
Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering
title Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering
title_full Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering
title_fullStr Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering
title_full_unstemmed Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering
title_short Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering
title_sort tuning localized surface plasmon resonance of nanoporous gold with a silica shell for surface enhanced raman scattering
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410204/
https://www.ncbi.nlm.nih.gov/pubmed/30759881
http://dx.doi.org/10.3390/nano9020251
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