Structural, surface and electrical of flexible nanocomposites for dielectric applications

In this work, new composite films made of polypyrrole-graphitic carbon nitride (PPy/g-C3N4) and polyethylene terephthalate (PET) were prepared using the polymerization chemical method. The PET/PPy/g-C3N4 exhibit combination of mechanical and dielectric properties, making them promising materials for applied in industry devices. The X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy mapping techniques proved that the nanocomposites were successfully fabricated. The dielectric parameters were measured by changing the PPy/g-C3N4 concentration in frequency range of 10 Hz to 6 MHz. The dielectric constant increased from 38.9 for PET to 426.4 for the composite PET/PPy/g-C3N4, and the energy density enhanced from 1.72 × 10−4 to 1.89 × 10−3 J/m3, while the relaxation time decreased from 4.2 × 10−2 to 0.34 × 10−3 s. The addition of g-C3N4 introduces nitrogen functionalities that improve dielectric polarization through interfacial interactions with PPy chains. The incorporation of g-C3N4 contributes to process the charge discharge behavior, confirming their potential for applied in flexible energy storage devices.