Figure 1

(a) XRD patterns of Fe₃O₄ (F), Fe₃O₄@SiO₂ (FS), Fe₃O₄@SiO₂@ZnO (FSZ), and Fe₃O₄@SiO₂@ZnO@Ag (FSZA); (b) SEM images of FSZA; (c) TEM images of FSZA; (d–g) The elemental mapping of O, Fe, Si, Zn, and Ag of FSZA, respectively; (h)HRTEM image of FSZA; (I) TEM-SAD image of FSZA.