Abstract
The effect of hierarchical architecture on the electromagnetic properties of microwave absorber candidates is important for absorption design. This work prepares dendritic cobalt powders by a simple hydrothermal reduction method. The study of microwave electromagnetic properties reveals that dielectric polarization relaxation dominates over the power loss owing to the superstructure with a large volume of branches. Compared with the conventional spherical filler, a composite consisting of dendritic filler shows an improved electromagnetic absorption performance in low frequencies due to the enhancement of both the impedance match to free air and the loss induced by interfacial polarization and Ohmic resistance.
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