Magnetic Fe₃O₄/Ag Hybrid Nanoparticles as Surface-Enhanced Raman Scattering Substrate for Trace Analysis of Furazolidone in Fish Feeds

Figure 2

TEM images of (a) Fe₃O₄ NPs and (b) Fe₃O₄/Ag hybrid NPs (FA-3) at a 4 : 1 molar ratio of Ag⁺ and Fe₃O₄; (c) statistical histogram of diameters of four types of Fe₃O₄/Ag hybrid NPs (𝑛=100) and (d) EDS spectrum of representative Fe₃O₄/Ag hybrid NPs.

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