Microstructure and microwave absorption properties of Fe3O4/dextran/SnO2 multilayer microspheres

• DOI: 10.1016/j.matlet.2011.06.106
• Publication Date: 2011-07-06T09:26:37Z
• Authors: Yiming Wang; Zhi Luo; Ruoyu Hong
• Keywords: Reflection loss; Dielectric loss; Paraffin wax

Abstract Fe3O4/dextran/SnO2 multilayer microspheres have been successfully designed and synthesized by solvothermal and hydrothermal reactions. Dextran worked as a linker between Fe3O4 core and SnO2 shell. It can not only prevent the oxidation of Fe3O4 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 Fe3O4/dextran/SnO2 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 Fe3O4/dextran/SnO2 microspheres and the effective complementarity between dielectric loss and magnetic loss.