In this article, spinel ferrite CoFe2O4 and multi-walled carbon nanotubes (MWCNTs) composites are constructed by a facile one-step solvothermal method. The pure phase of particles is confirmed X-ray diffraction patterns. Microstructure analysis demonstrates that monodisperse microspheres wound MWCNTs. With the introduction CNTs, there significant enhancement in imaginary part permittivity (ε″) ...