fig4

Figure 4. The fabrication methods and EMW absorption mechanisms of (A) Fe₃O₄@PPy/rGO^[44]; (B) FeCoNi@PPy derived C@HCNB^[23]; (C) ZnFe₂O₄@PPy^[8]. EMW: Electromagnetic wave; PPy: polypyrrole; rGO: reduced graphene oxide; HCNB: hollow carbon nanoboxes.