Fig. 7

SEM micrographs of the synthesized NPs: (a) Fe3O4 NPs, (b) Fe2O3 NPs, (c) Ag-doped Fe3O4 NPs at different magnifications, (d) Ag-doped Fe2O3NPs.
SEM micrographs of the synthesized NPs: (a) Fe3O4 NPs, (b) Fe2O3 NPs, (c) Ag-doped Fe3O4 NPs at different magnifications, (d) Ag-doped Fe2O3NPs.