Abstract
A simple method for obtaining SiO2:Ag:Si and Ag:Si hybrid nanostructures is presented. High-temperature annealing of an Ag island film on the surface of c-Si makes it possible to preserve the plasmonic properties of Ag nanoparticles and protect them from external influences by coating them with a thermally grown layer of SiO2. The calculation of the electric field strength distribution in the structure with embedded Ag nanoparticles in c-Si demonstrates the presence of intrinsic “hot spots” at the corners of the nanoparticles, which leads to a maximum enhancement factor (~106) of Raman scattering. A numerical calculation of the dependence of the spectral position of a localized plasmon resonance on the geometry of structures can serve as a basis for their design in the future. Surface-enhanced Raman scattering showed reliable detection of the methyl orange from an aqueous solution at a concentration of <10–5 M.
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ACKNOWLEDGMENTS
The authors are grateful to A.A. Krasilin for discussion of the article materials.
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The paper was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of the state order no. 0040-2019-0012.
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Ermina, A.A., Solodovchenko, N.S., Prigoda, K.V. et al. SERS-Active Substrates Based on Embedded Ag Nanoparticles in c-Si: Modeling, Technology, Application. Semiconductors 57, 587–593 (2023). https://doi.org/10.1134/S1063782623040061
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DOI: https://doi.org/10.1134/S1063782623040061