Influence of barium titanate and graphite on electrical attributes of Polyvinylidene fluoride matrix composites

Binary and ternary composite nanofibers were synthesized by adding different weight ratios of Barium titanate (BT) and Graphite (G) in Polyvinylidene fluoride (PVDF) via electrospinning technique. The electrical properties of these composite materials were measured using an LCR meter. Fourier-transform infrared spectroscopy (FTIR) was used to analyze functional groups, while scanning electron microscopy (SEM) was used to investigate surface morphology. The FTIR analysis indicated discernible interactions between PVDF, BT and G at different weight percentages, while SEM micrographs showcased the formation of nanofibers. The incorporation of 5 wt% BT in PVDF led to a 45 % increase in dielectric constant, a 40.5 % increase in capacitance, a 1.88 % rise in dielectric loss and a 42.6 % increase in AC conductivity. Interestingly, the addition of small amount, i.e., 0.5 wt%, of graphite to PVDF +5 wt% BT resulted in a further rise of 9.5 % in dielectric constant, a further increase of 50.4 % in capacitance, and a reduction of 8.58 % in dielectric loss and 4 % in AC conductivity at the highest frequency of 2 MHz. These composites showed potential for use as dielectric materials in high-frequency microelectronic devices.