Synthesis of hexagonal CoFe2O4/ZnO nanoparticles and their electromagnetic properties

We present a facile method to synthetize CoFe2O4/ZnO nanoparticles with hexagonal shape through high temperature hydrolysis of chelated zinc diethylene glycol alkoxide complexes in alkaline Diethylene Glycol solution in the presence of CoFe2O4 nanoparticles. X-ray diffraction data show that the obtained nanoparticles are composed of CoFe2O4 and ZnO. The hexagonal particle morphology of the resulting nanoparticles was analyzed using transmission electron microscopy, indicating that the shape of the nanoparticles is hexagonal with a mean diameter below 100 nm. Electromagnetic parameters in GHz frequency range was measured by a network analyzer, which reveals that magnetic and dielectric properties are combined due to both the interfacial polarization process and multiresonance in the as-prepared hexagonal CoFe2O4/ZnO nanoparticles.

► CoFe2O4/ZnO composite nanoparticles with hexagonal shape.
► High temperature hydrolysis enables growth of hexagonal ZnO on CoFe2O4.
► Combined electromagnetic properties.