Silicon nanowire arrays coated with Ag and Au dendrites for surface-enhanced Raman scattering

Grevtsov, Nikita, Burko, Aliaksandr, Redko, Sergey, Khinevich, Nadzeya, Zavatski, Siarhei, Niauzorau, Stanislau and Bandarenka, Hanna ORCID: https://orcid.org/0000-0003-4254-8261 2020. Silicon nanowire arrays coated with Ag and Au dendrites for surface-enhanced Raman scattering. MRS Advances 5 (39) , pp. 2023-2032. 10.1557/adv.2020.332

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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).

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Publisher:	Springer
ISSN:	2059-8521
Last Modified:	07 Sep 2026 21:53
URI:	https://orca.cardiff.ac.uk/id/eprint/188553

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