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. 2023 Jan 31;13(2):210. doi: 10.3390/bios13020210

Figure 1.

Figure 1

Structure characterization of Fe3O4@Au/DTNB/Au/4-MPBA. TEM images of (a) Fe3O4, (b) Fe3O4@Au-seed/DTNB, (c) Fe3O4@Au/DTNB, (d) Fe3O4@Au/DTNB/Au/4-MPBA tags, and their corresponding magnified TEM images in (e), (f), (g), and (h), respectively. (i) SEM images of (a–d). (j) EDS elemental mapping images of Fe3O4@Au/DTNB/Au/4-MPBA. (k) SERS signal intensities of Fe3O4, Fe3O4@Au-seed/DTNB, and Fe3O4@Au/DTNB. (l) Zeta potentials of Fe3O4, Fe3O4−PEI, Fe3O4@Au-seed, Fe3O4@Au/DTNB, Fe3O4@Au/DTNB/PEI, and Fe3O4@Au/DTNB/Au.