Wet Chemical Synthesis and Characterization of Au Coatings on Meso- and Macroporous Si for Molecular Analysis by SERS Spectroscopy

Zavatski S. Popov A.I. Chemenev A. Dauletbekova A. Bandarenka H.
November 2022 MDPI

Crystals
2022 #12 Issue 11

Porous silicon (PS) is a promising material for nanostructure fabrication providing a precise control over its size, shape, and spatial distribution. This makes it an excellent candidate for constructing highly sensitive, reproducible, and low-cost platforms for surface enhanced Raman scattering (SERS) spectroscopy. In this work, we connect the PS structural parameters with the morphology of the gold nanostructures fabricated on its surface, placing the emphasis on the SERS response. Two different types of PS are considered here, namely meso- and macro-PS. The former is prepared by Si electrochemical etching, applying three different current densities: 100 mA cm⁻², 60 mA cm⁻², and 30 mA cm⁻², while the technological parameters for the latter are selected to mimic metal nanovoids’ (Me NVs) configuration. The gold-coated PS surfaces are produced via an electroless chemical deposition method for different time periods. By performing comprehensive structural, morphological, and optical characterization, we show the importance of the size and density of the PS pore openings, which govern the Au growth kinetics. The results presented in this work assure a simple yet flexible approach for the fabrication of large-area plasmonic gold nanostructures, which are not only suitable for advanced SERS spectroscopy studies but can also serve for a wider range of plasmonic applications.

fabrication , gold , porous silicon , SERS , XRD

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Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, Minsk, 220013, Belarus
Institute of Advanced Materials and Technologies, National Research University of Electronic Technology, Zelenograd, 124498, Russian Federation
Institute of Solid State Physics, University of Latvia, Riga, LV-1063, Latvia
Department of Technical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan

Applied Plasmonics Laboratory
Institute of Advanced Materials and Technologies
Institute of Solid State Physics
Department of Technical Physics

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