Dielectric relaxation in ZnO nanostructure

Abstract

ZnO nanoparticles have been prepared in methanol through chemical technique using thioglycerol as a capping agent. Nanostructures of the prepared ZnO particles have been characterized by scanning electron microscope (SEM). The frequency-dependent dielectric dispersion of zinc oxide (ZnO) nanostructure is investigated in a frequency range from 100 Hz to 1 MHz and in the temperature range from 293 to 333 K by alternating current impedance spectroscopy (ACIS). An analysis of the complex permittivity (ε' and ε") with frequency is performed assuming a distribution of relaxation times. The frequency-dependent electrical data are analyzed in the framework of conductivity and modulus formalisms. The dielectric relaxation in ZnO nanostructures is modelled by Davidson-Cole method. The frequency dependent conductivity data are fitted to the universal power law.