Abstract
In the present work, we have synthesized ZnO nanostructures by sol-gel method in air at different selected sintering temperatures ranging from room temperature to 400 0 C and studied their structural, optical and ferroelectric properties. The synthesized samples are characterized by X-ray diffractrometer for structural properties and the optical properties are measured through UV-Visible spectrophotometer and Photoluminescence. The X-ray diffraction pattern indicates the pure phase formation of ZnO. Furthermore, photoluminescence spectra also confirm the formation of wurtzite structure of ZnO. X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) studies show that the particle size of ZnO nanostructures increases with increasing the sintering temperature. The optical band gaps calculated through UV spectroscopy are found to be decreasing from 4.47 to 3.73 eV for samples sintered at room temperature to 400 0 C, respectively. Moreover, a weak ferroelectricity has been observed in ZnO nanostructures at room temperature through Polarization vs Electric field (P-E) loops.
Highlights
Over the past few years, metal oxide semiconductors play important roles in many areas of science and technology and have attracted great interest due to their significant potential application
The average crystallite size (t) of ZnO nanoparticles is calculated by using Scherrer formula: D ~ K λ / β cosθB, where k~0.89 is the shape factor, λ is wavelength of CuKα (1.54059 ̊A) radiation, β=B-b, B is the full width at half maximum (FWHM), b represents the instruments broadening and θB is the angle of Bragg diffraction
The particle size, calculated by Debye Scherrer formula using X-ray diffraction (XRD) data, increases from 13 to 31 nm for the samples sintered at room temperature to 400 0C, respectively
Summary
Over the past few years, metal oxide semiconductors play important roles in many areas of science and technology and have attracted great interest due to their significant potential application. Nano sized zinc oxide due to the large band gap and high exciton binding energy shows various useful properties and gives large and diverse range of growth of in the present work, we synthesized ZnO nanostructures by sol-gel method and studied the structural, optical and ferroelectric properties. It is observed that the particle size of ZnO nanostructures increases while optical band gap decreases as we increase the sintering temperature.
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