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. 2021 Jun 9;190:113421. doi: 10.1016/j.bios.2021.113421

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Fig. 3 — (A, B) SERS spectra and intensities of 4-MBA from randomly fifteen measured sites on SERS-active substrate. (C) SEM image of the as-prepared sandwich immunoassay structure. (D) EDS spectrum of the as-prepared sandwich immunoassay structure. (E, F) SERS spectra of the sandwich immunoassay structure with 1–4 layers of Au NPs and the corresponding intensities at 1077 cm⁻¹ and 1586 cm⁻¹.