Abstract
Nanocrystalline zinc sulfide (ZnS) (nanorods) was synthesized by chemical precipitation method, and they were annealed in air at different temperatures in the range 200–700 °C for the phase transition of ZnS to ZnO. The characterization of the system was done by different techniques such as X-ray diffraction (XRD), high-resolution transmission electron microscopy, UV–Vis spectroscopy, photoluminescence spectroscopy and differential scanning calorimetry (DSC). From the XRD and TEM analysis, the crystal structure is found to convert from cubic ZnS phase to the hexagonal ZnO phase and its morphology from nanorods to nanoparticles with the increasing annealing temperatures. The UV–Visible absorption and photoluminescence measurements revealed that the relative changes in the phases alter the band gap and introduce new kinds of defects in the system. The percentage of the ZnS and ZnO phase has been found to be proportional to the annealing temperature for a fixed time interval, and the DSC measurement has also found similar results as in the XRD pattern during the phase transitions.
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Acknowledgments
We are thankful to the University Science Instrumentation Centre (USIC), University of Delhi (special thanks to Mr. Rahul Bhardwaj for TEM) for providing instrumental facility and University Grant Commission (UGC) for the financial support.
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Rani, G., Sahare, P.D. Study of the structural and morphological changes during the phase transition of ZnS to ZnO. Appl. Phys. A 116, 831–837 (2014). https://doi.org/10.1007/s00339-013-8173-6
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DOI: https://doi.org/10.1007/s00339-013-8173-6