Abstract
Hollow CoFe2O4 microspheres were successfully synthesized in high yield using a solvothermal method in the presence of long-chain ionic liquid [C18MIM][Br]. Uniform CoFe2O4 hollow spheres with a diameter of 100–200nm and a shell thickness of approximately 10–50nm are assembled by nanoparticles of 5–10nm and have cubic spinel structures. A minimum reflection loss of −15.23dB was observed at 16.98GHz for hollow CoFe2O4 microspheres with a thickness of 5.5mm, and the effective absorption frequency ranged from 15.28 to 18GHz. Hollow CoFe2O4 microspheres exhibited better microwave absorbing performance than solid microspheres. A possible formation mechanism of hollow CoFe2O4 microspheres was discussed.
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