Synergistic enhancement of dielectric properties of polymer matrix composites by micro‐nano bicomponent ceramics and conductive particles

Barium titanate (BaTiO3, BT) was co-doped by solid-state sintering with niobium pentoxide (Nb2O5) and cobalt trioxide (Co3O4) as dopants. The modified barium containing Nb Co (BTNC) larger particle size (0.5–1 μm) silver powder (Ag) smaller (25 nm) were co-filled polyvinylidene fluoride (PVDF) to prepare (BTNC-Ag)/PVDF three-phase composites. morphology crystal structure of composites characterised scanning electron microscope (SEM) X-ray diffraction (XRD), respectively. SEM shows that when the volume ratio BTNC Ag in composite is 4:1, two fillers have good dispersion polymer matrix could intersperse each other reduce voids. XRD patterns display filling powders conducive promoting enhancement peaks β phase γ PVDF. dielectric properties are effectively enhanced through synergistic effect micro-nano bicomponent ceramic conductive particles When filler (BTNC:Ag = 4:1) PVDF 2/1, best, constant reaches 134.1 at 102 Hz loss 0.04.