Oxygen-vacancy-rich Fe3O4/carbon nanosheets enabling high-attenuation and broadband microwave absorption through the integration of interfacial polarization and charge-separation polarization

An oxygen-vacancy-rich Fe 3 O 4 /carbon nanosheets composite is fabricated from Fe 3+ -gluconate complex as precursor using a spontaneous foaming strategy. The composite has a unique 2D structure and exhibits superior microwave absorption capability.