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Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching
In this study, we developed highly sensitive substrates for Surface-Enhanced-Raman-Scattering (SERS) spectroscopy, consisting of silicon nanowires (SiNWs) decorated by silver nanostructures using single-step Metal Assisted Chemical Etching (MACE). One-step MACE was performed on p-type Si substrates...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8308179/ https://www.ncbi.nlm.nih.gov/pubmed/34361147 http://dx.doi.org/10.3390/nano11071760 |
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author | Kochylas, Ioannis Gardelis, Spiros Likodimos, Vlassis Giannakopoulos, Konstantinos P. Falaras, Polycarpos Nassiopoulou, Androula G. |
author_facet | Kochylas, Ioannis Gardelis, Spiros Likodimos, Vlassis Giannakopoulos, Konstantinos P. Falaras, Polycarpos Nassiopoulou, Androula G. |
author_sort | Kochylas, Ioannis |
collection | PubMed |
description | In this study, we developed highly sensitive substrates for Surface-Enhanced-Raman-Scattering (SERS) spectroscopy, consisting of silicon nanowires (SiNWs) decorated by silver nanostructures using single-step Metal Assisted Chemical Etching (MACE). One-step MACE was performed on p-type Si substrates by immersion in AgNO(3)/HF aqueous solutions resulting in the formation of SiNWs decorated by either silver aggregates or dendrites. Specifically, dendrites were formed during SiNWs’ growth in the etchant solution, whereas aggregates were grown after the removal of the dendrites from the SiNWs in HNO(3) aqueous solution and subsequent re-immersion of the specimens in a AgNO(3)/HF aqueous solution by adjusting the growth time to achieve the desired density of silver nanostructures. The dendrites had much larger height than the aggregates. R6G was used as analyte to test the SERS activity of the substrates prepared by the two fabrication processes. The silver aggregates showed a considerably lower limit of detection (LOD) for SERS down to a R6G concentration of 10(−13) M, and much better uniformity in terms of detection in comparison with the silver dendritic structures. Enhancement factors in the range 10(5)–10(10) were calculated, demonstrating very high SERS sensitivities for analytic applications. |
format | Online Article Text |
id | pubmed-8308179 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-83081792021-07-25 Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching Kochylas, Ioannis Gardelis, Spiros Likodimos, Vlassis Giannakopoulos, Konstantinos P. Falaras, Polycarpos Nassiopoulou, Androula G. Nanomaterials (Basel) Article In this study, we developed highly sensitive substrates for Surface-Enhanced-Raman-Scattering (SERS) spectroscopy, consisting of silicon nanowires (SiNWs) decorated by silver nanostructures using single-step Metal Assisted Chemical Etching (MACE). One-step MACE was performed on p-type Si substrates by immersion in AgNO(3)/HF aqueous solutions resulting in the formation of SiNWs decorated by either silver aggregates or dendrites. Specifically, dendrites were formed during SiNWs’ growth in the etchant solution, whereas aggregates were grown after the removal of the dendrites from the SiNWs in HNO(3) aqueous solution and subsequent re-immersion of the specimens in a AgNO(3)/HF aqueous solution by adjusting the growth time to achieve the desired density of silver nanostructures. The dendrites had much larger height than the aggregates. R6G was used as analyte to test the SERS activity of the substrates prepared by the two fabrication processes. The silver aggregates showed a considerably lower limit of detection (LOD) for SERS down to a R6G concentration of 10(−13) M, and much better uniformity in terms of detection in comparison with the silver dendritic structures. Enhancement factors in the range 10(5)–10(10) were calculated, demonstrating very high SERS sensitivities for analytic applications. MDPI 2021-07-06 /pmc/articles/PMC8308179/ /pubmed/34361147 http://dx.doi.org/10.3390/nano11071760 Text en © 2021 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 | Article Kochylas, Ioannis Gardelis, Spiros Likodimos, Vlassis Giannakopoulos, Konstantinos P. Falaras, Polycarpos Nassiopoulou, Androula G. Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching |
title | Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching |
title_full | Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching |
title_fullStr | Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching |
title_full_unstemmed | Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching |
title_short | Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching |
title_sort | improved surface-enhanced-raman scattering sensitivity using si nanowires/silver nanostructures by a single step metal-assisted chemical etching |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8308179/ https://www.ncbi.nlm.nih.gov/pubmed/34361147 http://dx.doi.org/10.3390/nano11071760 |
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