Dielectric Properties of BN-ZnO-GNP Doped PU-EG Composites

Abstract

In this study, ZnO and GNP were added separately and together to improve the dielectric constant values of hexagonal boron nitride. Polyurethane (PU) and ethylene glycol (EG) were used as binders. The productions were carried out by dispersing each additive separately in acetone and then coating it with the doctor blade method on aluminium foil. The characterizations were carried out with FTIR, XRD and SEM. Then, the capacitance values of each composite were first measured with the LCR meter and then the dielectric constant were calculated. According to the results, the highest dielectric constant values were obtained at the 100 and 120 Hz frequencies. At the frequency value of 100 kHz, the lowest dielectric constant was obtained in all composites. Compared to pure BN, an increase of 115% was achieved with ZnO doping, while an increase of up to 145% was achieved with GNP doping. The highest increase was achieved up to 160% with ZnO + GNP doping. In addition, with the doping of ZnO + GNP, the amount of decrease at high frequencies was less than the others. This is thought to be due to the combined effect of both ZnO and GNP, which has a large surface area.

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