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Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering
In surface-enhanced Raman scattering (SERS), both chemical (CE) and electromagnetic (EM) field effects contribute to its overall enhancement. However, neither the quantification of their relative contributions nor the substrate dependence of the chemical effect have been well established. Moreover,...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6404390/ https://www.ncbi.nlm.nih.gov/pubmed/30873327 http://dx.doi.org/10.3762/bjnano.10.56 |
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author | Su, Yarong Shi, Yuanzhen Wang, Ping Du, Jinglei Raschke, Markus B Pang, Lin |
author_facet | Su, Yarong Shi, Yuanzhen Wang, Ping Du, Jinglei Raschke, Markus B Pang, Lin |
author_sort | Su, Yarong |
collection | PubMed |
description | In surface-enhanced Raman scattering (SERS), both chemical (CE) and electromagnetic (EM) field effects contribute to its overall enhancement. However, neither the quantification of their relative contributions nor the substrate dependence of the chemical effect have been well established. Moreover, there is to date no understanding of a possible coupling between both effects. Here we demonstrate how systematically engineered silver and gold planar and nanostructured substrates, covering a wide range of field enhancements, provide a way to determine relative contributions of chemical and electromagnetic field-enhancement in SERS measurements of benzenethiol. We find a chemical enhancement of 2 to 14 for different vibrational resonances when referencing against a vibrational mode that undergoes minimal CE. The values are independent of substrate type and independent of the enhancement of the electromagnetic intensity in the range from 1 to 10(6). This absence of correlation between chemical and electromagnetic enhancement resolves several long-standing controversies on substrate and intensity dependence of the chemical enhancement and allows for a more systematic design of SERS substrates with desired properties. |
format | Online Article Text |
id | pubmed-6404390 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
spelling | pubmed-64043902019-03-14 Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering Su, Yarong Shi, Yuanzhen Wang, Ping Du, Jinglei Raschke, Markus B Pang, Lin Beilstein J Nanotechnol Full Research Paper In surface-enhanced Raman scattering (SERS), both chemical (CE) and electromagnetic (EM) field effects contribute to its overall enhancement. However, neither the quantification of their relative contributions nor the substrate dependence of the chemical effect have been well established. Moreover, there is to date no understanding of a possible coupling between both effects. Here we demonstrate how systematically engineered silver and gold planar and nanostructured substrates, covering a wide range of field enhancements, provide a way to determine relative contributions of chemical and electromagnetic field-enhancement in SERS measurements of benzenethiol. We find a chemical enhancement of 2 to 14 for different vibrational resonances when referencing against a vibrational mode that undergoes minimal CE. The values are independent of substrate type and independent of the enhancement of the electromagnetic intensity in the range from 1 to 10(6). This absence of correlation between chemical and electromagnetic enhancement resolves several long-standing controversies on substrate and intensity dependence of the chemical enhancement and allows for a more systematic design of SERS substrates with desired properties. Beilstein-Institut 2019-02-25 /pmc/articles/PMC6404390/ /pubmed/30873327 http://dx.doi.org/10.3762/bjnano.10.56 Text en Copyright © 2019, Su et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms) |
spellingShingle | Full Research Paper Su, Yarong Shi, Yuanzhen Wang, Ping Du, Jinglei Raschke, Markus B Pang, Lin Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering |
title | Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering |
title_full | Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering |
title_fullStr | Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering |
title_full_unstemmed | Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering |
title_short | Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering |
title_sort | quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced raman scattering |
topic | Full Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6404390/ https://www.ncbi.nlm.nih.gov/pubmed/30873327 http://dx.doi.org/10.3762/bjnano.10.56 |
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