Journal
OPTIK
Volume 158, Issue -, Pages 1006-1015Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.ijleo.2017.12.174
Keywords
ZnO-NPs; Chemical precipitation; Annealing; XRD; Crystallite; Hexagonal wurzite; Red shift
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Zinc Oxide Nanoparticles (ZnO-NPs) were synthesized by chemical precipitation method at low temperature using Zinc nitrate hexa hydrate [Zn (NO3)(2 center dot)6H(2)P] and sodium hydroxide (NaOH) as precursors followed by annealing at different temperatures ranging from 200 degrees C to 600 degrees C for two hours. The structural and optical properties of resulting ZnO products were investigated by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR). Ultra Violet-Visible ((UV-vis)) Spectroscopy and Photo Luminescence(PL) Spectroscopy respectively. The XRD results reveal that the prepared ZnO-NPs exhibit hexagonal wurtzite structure and the increasing annealing temperatures lead to an increase in the average crystallite size as well as improvement in the crystallinity. SEM images reveal the formation of nearly spherical ZnO nanoparticles with slight agglomeration. The FTIR spectra of all the samples exhibits peak, which corresponds to Zn-O stretching band. The UV-Vis absorption spectra show a slight red shift along with decrease in optical band gap from 3.84 eV to 3.56 eV with increase in annealing temperature. The room temperature PL spectra with excitation wavelength 320nm show increase in UV emission intensity with respect to annealing temperature. 2018 Elsevier GmbH. All rights reserved.
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