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. Author manuscript; available in PMC: 2022 May 13.
Published in final edited form as: Acc Chem Res. 2021 Oct 22;54(21):3991–4000. doi: 10.1021/acs.accounts.1c00498

Figure 2. Characterization of MPNs.

Figure 2.

(A) Schematic and TEM images of MPNs (top) and elemental mapping for Au and Fe (bottom). A magnetic core was coated with a 12-nm thick Au shell. (B) Cross-sectional absorption spectrum of MPNs. For 12-nm thick Au shell, the peak absorbance was at 535 nm. (C) Electric field simulation at the surface plasmon resonance condition. Electric field of MPN was mainly confined to the inner and outer surfaces and its field enhancement factor (E/E0 = 5.8) at the outer one was almost the same as that of 40 nm AuNP (E/E0 = 6.0). Adapted with permission from ref 2. Copyright © 2020, The Authors, under exclusive licence to Springer Nature Limited.