Surface-Enhanced Raman Scattering from Dye Molecules in Silicon Nanowire Structures Decorated by Gold Nanoparticles
Ikramova S.B. Utegulov Z.N. Dikhanbayev K.K. Gaipov A.E. Nemkayeva R.R. Yakunin V.G. Savinov V.P. Timoshenko V.Y.
March-1 2022MDPI
International Journal of Molecular Sciences
2022#23Issue 5
Silicon nanowires (SiNWs) prepared by metal-assisted chemical etching of crystalline silicon wafers followed by deposition of plasmonic gold (Au) nanoparticles (NPs) were explored as templates for surface-enhanced Raman scattering (SERS) from probe molecules of Methylene blue and Rhodamine B. The filling factor by pores (porosity) of SiNW arrays was found to control the SERS efficiency, and the maximal enhancement was observed for the samples with porosity of 55%, which corresponded to dense arrays of SiNWs. The obtained results are discussed in terms of the electromagnetic enhancement of SERS related to the localized surface plasmon resonances in Au-NPs on SiNW’s surfaces accompanied with light scattering in the SiNW arrays. The observed SERS effect combined with the high stability of Au-NPs, scalability, and relatively simple preparation method are promising for the application of SiNW:Au-NP hybrid nanostructures as templates in molecular sensorics.
Gold , Mesopores , Molecular sensorics , Nanoparticles , Nanostructures , Nanowires , Plasmonics , Silicon , Surface-enhanced Raman scattering
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Faculty of Physics and Technology, Al-Farabi Kazakh National University, 71, Almaty, 050040, Kazakhstan
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Department of Medicine, Nazarbayev University School of Medicine, Nur-Sultan, 010000, Kazakhstan
National Nanotechnology Laboratory Open Type, Faculty of Physics and Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russian Federation
Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, 119991, Russian Federation
Faculty of Physics and Technology
Department of Physics
Department of Medicine
National Nanotechnology Laboratory Open Type
Faculty of Physics
Lebedev Physical Institute of the Russian Academy of Sciences
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