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. 2019 May 14;12(10):1581. doi: 10.3390/ma12101581

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Top view(upper) and cross-section(below) SEM images of Ag nanorods arrays deposited on different substrates at 2.4 Å/s of deposition rate. (1) Si/SiO₂, (2) Si/SiO₂/W, (3) Sapphire, (4) Si/SiO₂/G, and (5) P-Si/SiO₂. (b) SERS spectra of R6G absorbed on Ag in (a). (c) SERS efficiency of each Ag substrate.