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Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect r...

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Autores principales: Zhuang, Chao, Xu, Yifan, Xu, Ningsheng, Wen, Jinxiu, Chen, Huanjun, Deng, Shaozhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210301/
https://www.ncbi.nlm.nih.gov/pubmed/30326557
http://dx.doi.org/10.3390/s18103458
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author Zhuang, Chao
Xu, Yifan
Xu, Ningsheng
Wen, Jinxiu
Chen, Huanjun
Deng, Shaozhi
author_facet Zhuang, Chao
Xu, Yifan
Xu, Ningsheng
Wen, Jinxiu
Chen, Huanjun
Deng, Shaozhi
author_sort Zhuang, Chao
collection PubMed
description Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233–5237), which therefore should be promising for the development of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7.9, which exhibit plasmon resonances around 1064 nm. The refractive index (RI) sensitivity of these nanorods have been evaluated by varying their dielectric environment, whereby a sensitivity as high as 473 nm/RIU (refractive index unit) can be obtained. Furthermore, we have demonstrated the large-aspect-ratio nanorods as efficient substrate for surface enhanced Raman spectroscopy (SERS), where an enhancement factor (EF) as high as 9.47 × 10(8) was measured using 4-methylbenzenethiol (4-MBT) as probe molecule. Finally, a type of flexible SERS substrate is developed by conjugating the gold nanorods with the polystyrene (PS) polymer. The results obtained in our study can benefit the development of plasmonic sensing techniques utilized in the near-infrared spectral region.
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spelling pubmed-62103012018-11-02 Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios Zhuang, Chao Xu, Yifan Xu, Ningsheng Wen, Jinxiu Chen, Huanjun Deng, Shaozhi Sensors (Basel) Article Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233–5237), which therefore should be promising for the development of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7.9, which exhibit plasmon resonances around 1064 nm. The refractive index (RI) sensitivity of these nanorods have been evaluated by varying their dielectric environment, whereby a sensitivity as high as 473 nm/RIU (refractive index unit) can be obtained. Furthermore, we have demonstrated the large-aspect-ratio nanorods as efficient substrate for surface enhanced Raman spectroscopy (SERS), where an enhancement factor (EF) as high as 9.47 × 10(8) was measured using 4-methylbenzenethiol (4-MBT) as probe molecule. Finally, a type of flexible SERS substrate is developed by conjugating the gold nanorods with the polystyrene (PS) polymer. The results obtained in our study can benefit the development of plasmonic sensing techniques utilized in the near-infrared spectral region. MDPI 2018-10-15 /pmc/articles/PMC6210301/ /pubmed/30326557 http://dx.doi.org/10.3390/s18103458 Text en © 2018 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
Zhuang, Chao
Xu, Yifan
Xu, Ningsheng
Wen, Jinxiu
Chen, Huanjun
Deng, Shaozhi
Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios
title Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios
title_full Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios
title_fullStr Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios
title_full_unstemmed Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios
title_short Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios
title_sort plasmonic sensing characteristics of gold nanorods with large aspect ratios
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210301/
https://www.ncbi.nlm.nih.gov/pubmed/30326557
http://dx.doi.org/10.3390/s18103458
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