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The Wavelength-Dependent SERS Template Based on a Nanopillar Array

Surface-enhanced Raman spectroscopy (SERS) can be regarded as a powerful tool for probing chemical molecules by effectively enhancing Raman signals. However, the enhancement factors depend on the SERS template, the probed molecular structures, and the excitation laser wavelength. Herein, we proposed...

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Autores principales: Li, Jiayi, Li, Rui, Xu, Ying, Xue, Xiaojun, Chen, Xiaoming, Chui, Hsiang-Chen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657544/
https://www.ncbi.nlm.nih.gov/pubmed/36363038
http://dx.doi.org/10.3390/ma15217446
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author Li, Jiayi
Li, Rui
Xu, Ying
Xue, Xiaojun
Chen, Xiaoming
Chui, Hsiang-Chen
author_facet Li, Jiayi
Li, Rui
Xu, Ying
Xue, Xiaojun
Chen, Xiaoming
Chui, Hsiang-Chen
author_sort Li, Jiayi
collection PubMed
description Surface-enhanced Raman spectroscopy (SERS) can be regarded as a powerful tool for probing chemical molecules by effectively enhancing Raman signals. However, the enhancement factors depend on the SERS template, the probed molecular structures, and the excitation laser wavelength. Herein, we proposed a simple and easily fabricated nanostructured template for SERS and analyzed the wavelength-dependent factors. Three types of golden nanopillar arrays on silicon wafers were designed and manufactured. The SERS signals of the Rhodamine 6G (R6G) molecules were extracted. Three laser sources, a blue 17 mW 458 nm diode laser, a green 20 mW 532 nm laser, and a red 6 mW 633 nm laser, were employed as the excitation laser sources. The 458 nm laser was located far from the resonate spectrum of R6G. The optical intensity distributions for the different SERS templates excited by three laser beams were also simulated. The enhancement factors (EFs) of R6G on the three nanostructured templates were measured and compared. The photoluminescence spectrum of the nanostructured templates and SERS signals of R6G were also measured. In addition, the experimental results concerned optical simulations. The analysis tool that was used was a convolution profile of multiple Lorentzian line shapes with a Gaussian profile. It is helpful to understand the SERS signals when the excitation laser wavelength is located out of the resonance region of molecules. It can also provide a new design approach to fabricate an SERS Template with a nanopillar array for different excitation wavelengths.
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spelling pubmed-96575442022-11-15 The Wavelength-Dependent SERS Template Based on a Nanopillar Array Li, Jiayi Li, Rui Xu, Ying Xue, Xiaojun Chen, Xiaoming Chui, Hsiang-Chen Materials (Basel) Communication Surface-enhanced Raman spectroscopy (SERS) can be regarded as a powerful tool for probing chemical molecules by effectively enhancing Raman signals. However, the enhancement factors depend on the SERS template, the probed molecular structures, and the excitation laser wavelength. Herein, we proposed a simple and easily fabricated nanostructured template for SERS and analyzed the wavelength-dependent factors. Three types of golden nanopillar arrays on silicon wafers were designed and manufactured. The SERS signals of the Rhodamine 6G (R6G) molecules were extracted. Three laser sources, a blue 17 mW 458 nm diode laser, a green 20 mW 532 nm laser, and a red 6 mW 633 nm laser, were employed as the excitation laser sources. The 458 nm laser was located far from the resonate spectrum of R6G. The optical intensity distributions for the different SERS templates excited by three laser beams were also simulated. The enhancement factors (EFs) of R6G on the three nanostructured templates were measured and compared. The photoluminescence spectrum of the nanostructured templates and SERS signals of R6G were also measured. In addition, the experimental results concerned optical simulations. The analysis tool that was used was a convolution profile of multiple Lorentzian line shapes with a Gaussian profile. It is helpful to understand the SERS signals when the excitation laser wavelength is located out of the resonance region of molecules. It can also provide a new design approach to fabricate an SERS Template with a nanopillar array for different excitation wavelengths. MDPI 2022-10-24 /pmc/articles/PMC9657544/ /pubmed/36363038 http://dx.doi.org/10.3390/ma15217446 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Li, Jiayi
Li, Rui
Xu, Ying
Xue, Xiaojun
Chen, Xiaoming
Chui, Hsiang-Chen
The Wavelength-Dependent SERS Template Based on a Nanopillar Array
title The Wavelength-Dependent SERS Template Based on a Nanopillar Array
title_full The Wavelength-Dependent SERS Template Based on a Nanopillar Array
title_fullStr The Wavelength-Dependent SERS Template Based on a Nanopillar Array
title_full_unstemmed The Wavelength-Dependent SERS Template Based on a Nanopillar Array
title_short The Wavelength-Dependent SERS Template Based on a Nanopillar Array
title_sort wavelength-dependent sers template based on a nanopillar array
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657544/
https://www.ncbi.nlm.nih.gov/pubmed/36363038
http://dx.doi.org/10.3390/ma15217446
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