Polyimide composites composed of covalently bonded BaTiO3@GO hybrids with high dielectric constant and low dielectric loss

Abstract

Novel flexible three-phase high-k polyimide (PI) composites were fabricated by the incorporation of covalently bonded BaTiO₃@graphene oxide (BaTiO₃@GO) hybrids in which the BaTiO₃@GO hybrids were prepared by the reaction of amino modified BaTiO₃ particles and GO. A series of analyses, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman and XRD demonstrated that amino modified BaTiO₃ particles were successfully grafted onto the surface of GO. A dielectric constant as high as 285 (100 Hz), which was eighty times that of a pure PI film, a lower dielectric loss as low as 0.25 and high-frequency-shift dielectric relaxation were obtained for BaTiO₃@RGO/PI composites as the fraction of BaTiO₃@GO was 20 wt% (the corresponding volume fraction is 8 vol%). The flexible, high-k BaTiO₃@RGO/PI composites have promising potential applications for capacitors and electronic devices in the fields of micro electron.