To synthesize Fe3O4 nanoparticles, the solutions of 3.9 g Mohr's salt (NH4)2Fe(SO4)2 · 6H2O in 100 mL H2O (0.1 M) and 4.8 g NH4Fe(SO4)2 · 12H2O in 100 mL H2O (0.1 M) were prepared and mixed with a molar ratio of 1:2
To synthesize Fe3O4 nanoparticles, the solutions of 3.9 g Mohr's salt (NH4)2Fe(SO4)2 · 6H2O in 100 mL H2O (0.1 M) and 4.8 g NH4Fe(SO4)2 · 12H2O in 100 mL H2O (0.1 M) were prepared and mixed with a molar ratio of 1:2