Designed synthesis of wide range microwave absorption Fe3O4–carbon sphere composite

Abstract Fe 3 O 4 –carbon sphere composite was synthesized by a simple hydrothermal method. The as-synthesized products were characterized by field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrum (EDS), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and Raman spectrum. The complex permittivity and permeability of paraffin wax and Fe 3 O 4 –carbon sphere composite with different volume fraction of the composite were measured by vector network analysis. A wide region of microwave absorption was achieved due to dual dielectric and magnetic losses. When the matching thickness is 4 mm, the calculated reflection loss of the sample with 70% volume fraction of Fe 3 O 4 –carbon sphere composite exhibits a broad microwave absorption ranging from 2.5 to 18 GHz.

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