The role of annealing temperature on structural, optical and dielectric properties of La3+ modified Zinc Oxide (ZnO) nanostructures

Abstract

Abstract The present work reports the effect of La3+ ion substitution on structural, optical and dielectric properties of ZnO nanostructures synthesized via co-precipitation technique. The XRD (X-Ray Diffraction) result confirms the wurtzite hexagonal structure with space group P63mc. The calculated domain size, intra-plane spacing and volume of cell of La3+/ZnO-300 sample is 27.4 nm, 2.5493 A and 57.018 A3. The surface Morphology studies, Mapping of elements and EDS (Energy Dispersive Spectra) were performed via using SEM (scanning electron microscope). The PL spectra measured via photoluminescence spectrometer with excitation wavelength (λ) 320 nm. IR spectra with peaks near about 532–630 cm−1 were measured out via using FTIR (Furrier Transform Infrared Spectrometer) spectrometer and consequent to the stretching of the Zn-O bonds. The complex impedance spectroscopy of La3+/ZnO-300 sample was carried out via galvenostat/potentiostat in the range of frequency 5 MHz to 10 Hz at 300 K. The value of grain margin resistance is 31.25 MΩ (at RT) for La3+/ZnO-300 sample.