Mesoscopically ordered Fe3O4/C nano-composite for superior broadband electromagnetic wave absorption

Due to the seriousness of the electromagnetic pollution, it is urgent to develop high-efficiency broadband electromagnetic wave absorption (EMA) materials. As a traditional EMA material, the question of expanding absorption bandwidth for Fe 3 O 4 /C composite need to be addressed. Based on this consideration, rationally designed Fe 3 O 4 /C nano-composite with the regular mesoscopic (1–100 nm) arrangement structure has practical significance. Benefited from this unique structure, the obtained Fe 3 O 4 /C mesoscopic ordered nano-composite exhibits broadband absorbing characteristics in 2–12 GHz. The effective absorption bandwidth value of the material is 6.40 GHz at low frequency (covered C band) and the minimum reflection loss is −50.47 dB. The superior broadband is derived from the good whole-test-frequency impedance matching and the strong low-frequency magnetic loss, which is achieved by the regularly mesoscopic arrangement of the magnetic nanoparticles . This study will provide certain inspirations and guidance for the design of low frequency broadband EMA materials in the future.