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. 2022 Apr 4;13:143. doi: 10.1186/s13287-022-02816-0

Fig. 1.

Fig. 1

Morphology and characterization of MNPs synthesized via co-precipitation method of Fe3O4. a SEM images of MNPs at different resolutions (sized 15–30 nm). Scale bars equal 500 and 200 nm, respectively. b Magnetic properties of the MNPs analyzed by a VSM. (c) FTIR spectra of the MNPs in the range of 570–590 cm−1