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Title: Silicon Nanowire Arrays Coated with Ag and Au Dendrites for Surface-Enhanced Raman Scattering
Authors: Grevtsov, N. L.
Burko, A. A.
Redko, S. V.
Khinevich, N. V.
Zavatski, S. A.
Niauzorau, S. A.
Bandarenka, H. V.
Keywords: публикации ученых;silicon nanowires;chemical etching
Issue Date: 2020
Publisher: Cambridge University Press
Citation: Silicon Nanowire Arrays Coated with Ag and Au Dendrites for Surface-Enhanced Raman Scattering / N. Grevtsov [et. al.] // MRS Advances. – 2020. – Vol. 5, Issue 39. – P. 2023–2032. – DOI: 10.1557/adv.2020.332.
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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