Abstract
Control of dielectric properties of PVA/PoPDA-rGO-ZnO polymeric composites is an important issue in electrical applications. As a flexible dielectric nanocomposite for enhancing electrical energy storage (Capacitors) and electrical conductivity of the polymer. The synthesis of the crystalline structure of PVA/PoPDA-rGO-ZnO nanocomposite is achieved using several facile preparation methods. The study of structural properties is achieved by x-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared (FT-IR), while the electrical properties are characterized using capacitance data in the frequency range (1 MHz to 5 MHz) under the application of an alternating electrical field. The XRD, SEM, and FT-IR show the formation of the crystalline phase PVA/PoPDA-rGO-ZnO nanocomposite. The capacitance data test at the different frequencies indicated good electrical properties of the ternary nanocomposite. The PVA/PoPDA-rGO-ZnO achieved the highest A.C. electrical conductivity (σa.c) and dielectric constant (ɛ') (3.74*10-5 S/m), (1.7645) at frequencies of (5 MHz), (1 MHz) respectively, while the lowest dissipation factor (ɛ'') (0.29054) at the frequency of (5 MHz). The rGO nanosheets and ZnO nanoparticles, which look like flowers, play an effective role in the electrical properties. The rGO nanosheets within the PVA film act as a network of nanocapacitors to store the electric charges. The results proved that the electrical properties strongly depend on the applied electric field frequency.