3D flower-like Co-based oxide composites with excellent wideband electromagnetic microwave absorption

Transition metal oxides because of their excellent dielectric properties have been population for electromagnetic wave absorption application. In this paper, through two-step synthesis, hollow CoSnO3 was in-situ growth between layers of self-assembled flower-like ZnCo2O4 in the solvothermal process. The multi-layer sheet structure of ZnCo2O4 nanoflowers provides growth space for CoSnO3, which can increase interface polarization and natural resonance. Hybrid structure expands the propagation path of electromagnetic waves and the times of reflections and scattering. By adjusting the content of the growing process of CoSnO3, the maximum reflection loss (RL) at 12.4 GHz was -56.0 dB, and the wide effective absorption bandwidth (EAB) of 6.24 GHz (RL <-10 dB) was obtained at a thin matching thickness of 2.6 mm ZnCo2O4@CoSnO3 composites showed satisfactory impedance matching in the frequency range of 2-18 GHz. Therefore, ZnCo2O4@CoSnO3 composites provides new research idea for electromagnetic wave absorption in morphology designed.

Automated summary

By synthesizing hollow CoSnO3 in-situ between layers of self-assembled flower-like ZnCo2O4 in the solvothermal process, a new hybrid structure with multi-layer sheet morphology was formed, which enhances absorption performance by expanding the propagation path of electromagnetic waves.