Optical and Impedance Spectroscopy Study of ZnS Nanoparticles

Zinc Sulphide particle in the nanometer size regime has been synthesized using chemical routes. The particles were capped using 2-mercaptoethanol to achieve the stability and avoid the coalescence. The as-obtained particles were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), UV–VIS absorption and photoluminescence (PL) spectra. The dielectric measurements of the nanoparticles were carried out as a function of frequency (100 Hz–1 MHz) and temperature (298–373 K) by impedance spectroscopy. Impedance spectroscopy was employed to determine the electrical parameters (resistance, capacitance and relaxation time) of the grain and the grain boundary. The grain boundary conduction, total grain (grain plus grain boundary) and the frequency max of grain boundary followed an Arrhenius law associated with activation energies of 0.27eV, 0.28 eV and 0.3 eV respectively. KeywordsChemical synthesis, Impedance spectroscopy, Optical properties, Zinc Sulphide.