Enhanced electromagnetic wave absorption of Fe3O4@C derived from spindle-like MOF

• The hierarchical spindle-like Fe 3 O 4 @C composites were prepared. • The preparation process is very simple. • The H2 sample possesses the excellent absorption performance. Magnetic carbon materials derived from metal organic frameworks (MOFs) have aroused extensive concern for electromagnetic wave absorbing application. In this study, we synthesized spindle-like Fe-MOF to acquire different compositions and microstructures by adjusting the pyrolysis temperature. The hierarchical spindle-like Fe 3 O 4 @C composite prepared at 600 °C (H600) possesses intriguing electromagnetic wave (EMW) absorption performance due to subtle synergy of carbon framework and Fe 3 O 4 microspheres, as well as uniquely hierarchical porous structure. The maximum reflection loss of −54.9 dB is achieved and effective absorbing bandwidth (EAB) can attain 6.5 GHz (11.1–17.6 GHz) at 2.61 mm.