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Facile Synthesis and Characterization of CdSe/ZnSe Core/Shell and ZnxCd1−xSe Alloy Quantum Dots via Non-organometallic Route

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Abstract

Hexadecylamine (HDA) capped CdSe/ZnSe core/shell and ZnxCd1−xSe alloy quantum dots (QDs) have been synthesized successfully via a non-organometallic, hot injection method. The optical, structural and morphological properties of the as-synthesized QDs were determined by using, UV–visible (UV–Vis) and photoluminescence spectroscopy, X-ray diffraction and transmission electron microscopy (TEM). The effect of reaction time and temperature on the core/shell and alloy formation were investigated in detail. The addition of ZnSe precursor to the pre-synthesized HDA capped CdSe QDs at 230 °C produced core/shell CdSe/ZnSe QDs whereas at 250 °C an alloy QDs were obtained initially which later transformed to core/shell structure with time. On the other hand, the immediate addition of ZnSe precursor to the hot CdSe-precursor solution in HDA at 230 °C resulted in HDA capped ZnxCd1−xSe alloy QDs. The optical and structural characterisation shows that the as-synthesised core–shell and alloy QDs are of high quality. This method is simple, and fast for the preparation of core/shell and alloy binary QDs and will encourage their synthesis for various industrial applications.

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Acknowledgements

This work was supported by the National, Research Foundation (NRF), South Africa, University of Johannesburg, South Africa, Faculty of Science Research Committee, and University research Committee, South Africa for financial support.

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Authors and Affiliations

  1. Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa

    Oluwatobi Samuel Oluwafemi, Vuyelwa Ncapayi, Sundararajan Parani & Ncediwe Tsolekile

  2. Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein Campus, Corner Beit and Nind Street, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa

    Oluwatobi Samuel Oluwafemi, Vuyelwa Ncapayi, Sundararajan Parani & Ncediwe Tsolekile

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  1. Oluwatobi Samuel Oluwafemi
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  2. Vuyelwa Ncapayi
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  3. Sundararajan Parani
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  4. Ncediwe Tsolekile
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Correspondence to Oluwatobi Samuel Oluwafemi.

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Oluwafemi, O.S., Ncapayi, V., Parani, S. et al. Facile Synthesis and Characterization of CdSe/ZnSe Core/Shell and ZnxCd1−xSe Alloy Quantum Dots via Non-organometallic Route. J Clust Sci 30, 161–169 (2019). https://doi.org/10.1007/s10876-018-1471-6

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  • DOI: https://doi.org/10.1007/s10876-018-1471-6

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