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. 2020 Aug 17;15:165. doi: 10.1186/s11671-020-03395-w

Fig. 1.

Fig. 1

Characterization of the synthesized Fe3O4-Au core-shell NPs. a, b TEM observations of the synthesized Fe3O4-Au core-shell NPs. c, d NPs in aqueous solution, before and after applying an external magnetic field. e UV absorbance peak of synthesized core-shell NPs appears at ~ 530 nm. f Magnetic hysteresis loops of Fe3O4 core