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

Authors:
Wei Li
Wei Li
State Key Laboratory of Stem Cell and Reproductive Biology
China
Chao Ma
Chao Ma
Institute of Basic Medical Sciences
China
Dr. Ling Zhang, PhD
Dr. Ling Zhang, PhD
University of Iowa
Iowa city, IA | United States
Bin Chen
Bin Chen
Chongqing Key Laboratory of Vector Insects; Institute of Entomology and Molecular Biology
China
LuYang Chen
LuYang Chen
Centro de Biomedicina Molecular e Estrutural
Portugal
Heping Zeng
Heping Zeng
East China Normal University
China

Nanomaterials (Basel) 2019 Feb 12;9(2). Epub 2019 Feb 12.

Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

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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Source
http://dx.doi.org/10.3390/nano9020251DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410204PMC
February 2019
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