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Silicon Nanowire Arrays Coated with Ag and Au Dendrites for Surface-Enhanced Raman Scattering

Published online by Cambridge University Press:  20 August 2020

Nikita Grevtsov
Affiliation:
Micro- and Nanoelectronics Department, Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus
Aliaksandr Burko
Affiliation:
Micro- and Nanoelectronics Department, Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus
Sergey Redko
Affiliation:
Micro- and Nanoelectronics Department, Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus
Nadzeya Khinevich
Affiliation:
Micro- and Nanoelectronics Department, Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus Institute of Materials Science, Kaunas University of Technology, Kaunas, Lithuania
Siarhei Zavatski
Affiliation:
Micro- and Nanoelectronics Department, Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
Stanislau Niauzorau
Affiliation:
The Polytechnic School, Arizona State University, Mesa, AZ, United States
Hanna Bandarenka
Affiliation:
Micro- and Nanoelectronics Department, Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus The Polytechnic School, Arizona State University, Mesa, AZ, United States
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Abstract

Silicon nanowires (SiNWs) were comprehensively characterized in dependence on conditions of their formation via metal (Ag) -assisted chemical etching (MACE) of monocrystalline Si. The Ag structures remained on/between SiNWs based on both n- and p-Si were found to promote surface enhancement of Raman scattering (SERS) from organic molecules adsorbed on their surface. The Ag structures on/between the SiNWs/p-Si facilitated two times higher SERS-signal from 10-6 M rhodamine 6G than those in the SiNWs/n-Si. The activity of the SERS-substrates based on p-Si was improved by modification with small Au dendrites, which provided rich family of hot spots and prevented degradation of the SERS-activity observed for pure Ag dendrites due to formation of Ag2S during one week of storage in air. The SERS-substrates based on the Au/Ag dendrites on SiNWs/p-Si allowed to achieve nanomolar detection limit of rhodamine 6G and 5,5′-dithiobis (2-nitrobenzoic acid).

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Articles
Copyright
Copyright © Materials Research Society 2020

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