Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length

Inert dielectric shells coating the surface of metallic nanoparticles (NPs) are important for enhancing the NPs' stability, biocompatibility, and realizing targeting detection, but they impair NPs' sensing ability due to the electric fields damping. The dielectric shell not only determines...

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Main Authors: Li, Anran, Lim, Xinyi, Guo, Lin, Li, Shuzhou
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/139779
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1397792020-06-01T10:21:21Z Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length Li, Anran Lim, Xinyi Guo, Lin Li, Shuzhou School of Materials Science & Engineering Center of Programmable Materials Engineering::Materials Shell-coated NP Critical Thickness Inert dielectric shells coating the surface of metallic nanoparticles (NPs) are important for enhancing the NPs' stability, biocompatibility, and realizing targeting detection, but they impair NPs' sensing ability due to the electric fields damping. The dielectric shell not only determines the distance of the analyte from the NP surface, but also affects the field decay. From a practical point of view, it is extremely important to investigate the critical thickness of the shell, beyond which the NPs are no longer able to effectively detect the analytes. The plasmon decay length of the shell-coated NPs determines the critical thickness of the coating layer. Extracting from the exponential fitting results, we quantitatively demonstrate that the critical thickness of the shell exhibits a linear dependence on the NP volume and the dielectric constants of the shell and the surrounding medium, but only with a small variation influenced by the NP shape where the dipole resonance is dominated. We show the critical thickness increases with enlarging the NP sizes, or increasing the dielectric constant differences between the shell and surrounding medium. The findings are essential for applications of shell-coated NPs in plasmonic sensing. 2020-05-21T07:47:44Z 2020-05-21T07:47:44Z 2018 Journal Article Li, A., Lim, X., Guo, L., & Li, S. (2018). Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length. Nanotechnology, 29(16), 165501-. doi:10.1088/1361-6528/aaae3f 0957-4484 https://hdl.handle.net/10356/139779 10.1088/1361-6528/aaae3f 29424707 2-s2.0-85043484401 16 29 en Nanotechnology © 2018 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.1088/1361-6528/aaae3f
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Materials
Shell-coated NP
Critical Thickness
spellingShingle Engineering::Materials
Shell-coated NP
Critical Thickness
Li, Anran
Lim, Xinyi
Guo, Lin
Li, Shuzhou
Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
description Inert dielectric shells coating the surface of metallic nanoparticles (NPs) are important for enhancing the NPs' stability, biocompatibility, and realizing targeting detection, but they impair NPs' sensing ability due to the electric fields damping. The dielectric shell not only determines the distance of the analyte from the NP surface, but also affects the field decay. From a practical point of view, it is extremely important to investigate the critical thickness of the shell, beyond which the NPs are no longer able to effectively detect the analytes. The plasmon decay length of the shell-coated NPs determines the critical thickness of the coating layer. Extracting from the exponential fitting results, we quantitatively demonstrate that the critical thickness of the shell exhibits a linear dependence on the NP volume and the dielectric constants of the shell and the surrounding medium, but only with a small variation influenced by the NP shape where the dipole resonance is dominated. We show the critical thickness increases with enlarging the NP sizes, or increasing the dielectric constant differences between the shell and surrounding medium. The findings are essential for applications of shell-coated NPs in plasmonic sensing.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Li, Anran
Lim, Xinyi
Guo, Lin
Li, Shuzhou
format Article
author Li, Anran
Lim, Xinyi
Guo, Lin
Li, Shuzhou
author_sort Li, Anran
title Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
title_short Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
title_full Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
title_fullStr Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
title_full_unstemmed Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
title_sort quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length
publishDate 2020
url https://hdl.handle.net/10356/139779
_version_ 1681058279005880320