Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection

In this work, we develop a Ag@Al<sub>2</sub>O<sub>3</sub>@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierar...

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Autores principales:	Puran Pandey, Sundar Kunwar, Ki-Hoon Shin, Min-Kyu Seo, Jongwon Yoon, Woong-Ki Hong, Jung-Inn Sohn
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	SERS plasmonic core-shell-satellite Ag nanoparticles hotspots FDTD Biology (General) QH301-705.5 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/bff05ed29e834c078d550a9b9209fd65
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spelling	oai:doaj.org-article:bff05ed29e834c078d550a9b9209fd652021-11-25T17:54:11ZPlasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection10.3390/ijms2222121911422-00671661-6596https://doaj.org/article/bff05ed29e834c078d550a9b9209fd652021-11-01T00:00:00Zhttps://www.mdpi.com/1422-0067/22/22/12191https://doaj.org/toc/1661-6596https://doaj.org/toc/1422-0067In this work, we develop a Ag@Al<sub>2</sub>O<sub>3</sub>@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierarchical dewetting process of Ag films coupled with an atomic layer deposition (ALD) method for the Al<sub>2</sub>O<sub>3</sub> shell. Compared to bare Ag nanoparticles, several advantages of fabricating PCSS nanostructures are discovered, including high surface roughness, high density of nanogaps between Ag core and Ag satellites, and nanogaps between adjacent Ag satellites. Finite-difference time-domain (FDTD) simulations of the PCSS nanostructure confirm an enhancement in the electromagnetic field intensity (hotspots) in the nanogap between the Ag core and the satellite generated by the Al<sub>2</sub>O<sub>3</sub> shell, due to the strong core–satellite plasmonic coupling. The as-prepared PCSS-based SERS substrate demonstrates an enhancement factor (EF) of 1.7 × 10<sup>7</sup> and relative standard deviation (RSD) of ~7%, endowing our SERS platform with highly sensitive and reproducible detection of R6G molecules. We think that this method provides a simple approach for the fabrication of PCSS by a solid-state technique and a basis for developing a highly SERS-active substrate for practical applications.Puran PandeySundar KunwarKi-Hoon ShinMin-Kyu SeoJongwon YoonWoong-Ki HongJung-Inn SohnMDPI AGarticleSERSplasmonic core-shell-satelliteAg nanoparticleshotspotsFDTDBiology (General)QH301-705.5ChemistryQD1-999ENInternational Journal of Molecular Sciences, Vol 22, Iss 12191, p 12191 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	SERS plasmonic core-shell-satellite Ag nanoparticles hotspots FDTD Biology (General) QH301-705.5 Chemistry QD1-999
spellingShingle	SERS plasmonic core-shell-satellite Ag nanoparticles hotspots FDTD Biology (General) QH301-705.5 Chemistry QD1-999 Puran Pandey Sundar Kunwar Ki-Hoon Shin Min-Kyu Seo Jongwon Yoon Woong-Ki Hong Jung-Inn Sohn Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
description	In this work, we develop a Ag@Al<sub>2</sub>O<sub>3</sub>@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierarchical dewetting process of Ag films coupled with an atomic layer deposition (ALD) method for the Al<sub>2</sub>O<sub>3</sub> shell. Compared to bare Ag nanoparticles, several advantages of fabricating PCSS nanostructures are discovered, including high surface roughness, high density of nanogaps between Ag core and Ag satellites, and nanogaps between adjacent Ag satellites. Finite-difference time-domain (FDTD) simulations of the PCSS nanostructure confirm an enhancement in the electromagnetic field intensity (hotspots) in the nanogap between the Ag core and the satellite generated by the Al<sub>2</sub>O<sub>3</sub> shell, due to the strong core–satellite plasmonic coupling. The as-prepared PCSS-based SERS substrate demonstrates an enhancement factor (EF) of 1.7 × 10<sup>7</sup> and relative standard deviation (RSD) of ~7%, endowing our SERS platform with highly sensitive and reproducible detection of R6G molecules. We think that this method provides a simple approach for the fabrication of PCSS by a solid-state technique and a basis for developing a highly SERS-active substrate for practical applications.
format	article
author	Puran Pandey Sundar Kunwar Ki-Hoon Shin Min-Kyu Seo Jongwon Yoon Woong-Ki Hong Jung-Inn Sohn
author_facet	Puran Pandey Sundar Kunwar Ki-Hoon Shin Min-Kyu Seo Jongwon Yoon Woong-Ki Hong Jung-Inn Sohn
author_sort	Puran Pandey
title	Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
title_short	Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
title_full	Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
title_fullStr	Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
title_full_unstemmed	Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
title_sort	plasmonic core–shell–satellites with abundant electromagnetic hotspots for highly sensitive and reproducible sers detection
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/bff05ed29e834c078d550a9b9209fd65
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Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection

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