Abstract
In this work, we report the synthesis of porous flower-like Co/MnO composite microspheres assembled by plentiful lamellae for microwave absorption applications. Electron microscopy observations indicated that, in the composites, Co nanoparticles with the size of 20–30 nm are uniformly distributed in the MnO matrix. We investigated the electromagnetic (EM) wave absorption properties of the Co/MnO composites with different Co proportions. When the molar ratio between Co and MnO is 2:1, the best electromagnetic wave absorption performance is achieved. Notably, the optimal reflection loss value reaches −64.2 dB at 10.9 GHz corresponding to the thickness of 2.3 mm, and the effective absorption bandwidth (RL < −10 dB) is up to 6.0 GHz with the thickness of 2.1 mm. The prominent absorption performance of the as-prepared Co/MnO composites mainly arises from the superior impedance matching behavior and strong attenuation capacity as a consequence of the synergistic effect between Co and MnO nanoparticles as well a...
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