Synthesis of wurtzite-phase ZnS nanocrystal and its optical properties |
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Authors: | CS Tiwary P Kumbhakar AK Mitra K Chattopadhyay |
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Institution: | aDepartment of Physics, National Institute of Technology, Durgapur 713209, India;bDepartment of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India |
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Abstract: | The wurtzite phase of ZnS nanocrystal has been prepared by annealing in 200–600 °C temperature range, its cubic phase of 2–3 nm size, prepared through soft chemical method. Results of isochronal experiments of 2 h at different temperatures indicate that visible transformation to wurtzite from cubic ZnS appears at a temperature of 400 °C, which is about three times smaller than that of bulk ZnS phase transition temperature. The phases, nanostructures, and optical absorption characteristics are obtained through X-ray diffraction, transmission electron microscopy, and UV–visible absorption spectroscopy. A stable and green photoluminescence emission peaked at 518 nm is observed from the 600 °C annealed samples, under ultraviolet light excitation. |
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Keywords: | Zinc sulphide Wurtzite phase Nanostructures Photoluminescence Characterization |
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