Synthesis of hollow core-shell ZnFeO@C nanospheres with excellent microwave absorption properties.

The special hollow core-shell structure and excellent dielectric-magnetic loss synergy of composite materials are two crucial factors that have an important influence on the microwave absorption properties. In this study, hollow ZnFeO nanospheres were successfully synthesized by a solvothermal precipitation method firstly; based on this, a C shell precursor phenolic resin was coated on the ZnFeO hollow nanospheres' surface by an oxidative polymerization method, and then ZnFeO@C was obtained by high-temperature calcination. Samples were characterized by SEM, TEM, XRD, XPS, BET, VSM, VNA.