Incorporation of dielectric constituents to construct ternary heterojunction structures for high-efficiency electromagnetic response.

To satisfy the diverse requirements of low reflection and high absorption of microwave attenuation, the construction of multiple heterojunction structure is imperative. On the one hand, the impedance mismatching could be ameliorated via the addition of new component; on the other hand, the multiple interface polarizations derived from the architecture of heterojunction make for the dissipation of microwave. In this work, the ternary TiO/RGO/FeO composites exhibit tremendous superiority compared with single TiO or RGO no matter the absorption coefficient or effective bandwidth. The maximum absorption value of the TiO/RGO/FeO composites is -44.05dB at 14.48GHz with a low thickness of 2.0mm. In addition, the effective bandwidth (RL<-10dB) reaches 5.6GHz from 11.96 to 17.56GHz. The superior electromagnetic wave absorbing performance of the TiO/RGO/FeO composites derived from the appropriate impedance matching as well as the multiple polarization effect. The results adequately demonstrate the accessibility of the prepared TiO/RGO/FeO composites as a preeminent absorber.