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

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Fig. 1 — Preparation and characterization of the SERS nanotags. (A) SEM image of the Ag NPs. (B) TEM image of the Ag NPs. (C) Dimensional distribution map of the Ag NPs. (D) UV–vis extinction spectra of 4-MBA, Ag NPs, Ag@4MBA and SERS nanotags. (E) Normal Raman spectrum of 4-MBA and SERS spectra of Ag NPs, Ag@4MBA and SERS nanotags. (F) TEM image of the SERS nanotags.