NDLI: Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching

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Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching

Content Provider	MDPI
Author	Kochylas, Ioannis Gardelis, Spiros Likodimos, Vlassis Giannakopoulos, Konstantinos Falaras, Polycarpos Nassiopoulou, Androula
Copyright Year	2021
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.
Starting Page	1760
e-ISSN	20794991
DOI	10.3390/nano11071760
Journal	Nanomaterials
Issue Number	7
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-07-06
Access Restriction	Open
Subject Keyword	Nanomaterials Spectroscopy Silicon Nanowires Metal-assisted Chemical Etching Surface Enhanced Raman Spectroscopy Ag Dendrites Ag Aggregates
Content Type	Text
Resource Type	Article

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