Dielectric characterization of P(VDF-TrFE)-CuO nanocomposite solutions in the microwave frequency range using open-ended coaxial probe technique

Abstract

In this study, we measured the dielectric permittivity of P(VDF-TrFE)-CuO nanocomposite solutions in the microwave frequency range using an open-ended coaxial probe technique at room temperature. The dielectric permittivity, complex dielectric permittivity ε*= ε'-j ε'' and dielectric loss are determined for the composite solutions by the impedance measurements. It is observed that as the concentration of CuO increases up to 10 wt% in P(VDF-TrFE), dielectric permittivity is decreased. Upon further increase in the concentration of CuO an increase in ε' is noticed. The dielectric relaxation time of these composite solutions is analysed from the Havriliak-Negami relation. From the Cole-Cole plot, the optical dielectric constant, static dielectric constant, shape factor α, and molecular relaxation times are calculated. This study gives an insight into the relaxation behaviour of P(VDF-TrFE)-CuO nanocomposite solutions in the microwave frequency region (0.02 < GHz < 50).