Nickel-multiwalled carbon nanotubes/polyvinylidene fluoride composites with high dielectric permittivity

摘要

Composites with nickel particles coated multiwalled carbon nanotubes (Ni-MWNTs) embedded into polyvinylidene fluoride (PVDF) were prepared by solution blending and hot-press processing. The morphology, structure, crystallization behavior, and dielectric properties of composites were studied. The results showed that the crystallization of PVDF was affected by Ni-MWNTs. With the increment of Ni-MWNTs, the content of β-phase in PVDF increased. The dielectric permittivity was as high as 290 at 103 Hz when the weight fraction of Ni-MWNTs was 10%. The results can be explained by the space charge polarization at the interfaces between the insulator and the conductor, and the formation of microcapacitance structure.