Fig. 1 provides information on the morphology, size and structure of the synthesised Fe3O4 NPs.
The BF TEM image of Fig. 1a presents the HS reaction product and is shown to comprise crystalline
Fe3O4 NPs, as identified by SAED (inset), which exhibit some faceting but are generally isotropic and
< 50 nm in size (Fig. 2b). The peaks in the XRD pattern of Fig. 1c are in good agreement with t