Abstract
Fe 3O 4/dextran/SnO 2 multilayer microspheres have been successfully designed and synthesized by solvothermal and hydrothermal reactions. Dextran worked as a linker between Fe 3O 4 core and SnO 2 shell. It can not only prevent the oxidation of Fe 3O 4 but also be carbonize to another absorber carbon black. The as-synthesized microspheres were about 320 nm in size and well-defined in shape. The maximum reflection loss of Fe 3O 4/dextran/SnO 2 microspheres and paraffin wax composites could reach 20.26 dB at 4.72 GHz, and the bandwidth with a reflection loss less than − 10 dB was 4.86 GHz with 4 mm in thickness. The excellent microwave absorption properties of the composites were attributed to the special multilayer structures of Fe 3O 4/dextran/SnO 2 microspheres and the effective complementarity between dielectric loss and magnetic loss.
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