Figure 2

Magnetic saturation of synthesized samples at room temperature of (a) Fe3O4, (b) Fe3O4@SiO2, (c) Fe3O4@SiO2@CuO/ZnO Core–Shell and (d) Fe3O4@void@CuO/ZnO Yolk-Shell.

Magnetic saturation of synthesized samples at room temperature of (a) Fe3O4, (b) Fe3O4@SiO2, (c) Fe3O4@SiO2@CuO/ZnO Core–Shell and (d) Fe3O4@void@CuO/ZnO Yolk-Shell.