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Thiolated selenium as a new precursor for the aqueous synthesis of CdSe/CdS core/shell quantum dots

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Abstract

A new hydrothermal method for the synthesis of thiol-protected CdSe/CdS core/shell quantum dots (QDs) starting from thiolated cadmium and selenium is reported. Four different thiols namely; 3-mercaptopropane-1-sulfonic acid (MPSA), 2-mercaptosuccinic acid, 3-mercaptopropanoic acid (MPA) and 2-mercaptoacetic acid were used to prepare the precursors which also served as capping agent and sulphur source. The as-synthesized QDs were characterized by ultraviolet–visible (UV–Vis) and photoluminescence (PL) spectroscopy, fourier transform infrared spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy, Raman spectroscopy and transmission electron microscopy. The as-prepared QDs exhibited broad trap emission with longer lifetime (>100 ns) due to thiolate trap sites. The particle growth kinetics and the photoluminescent quantum yield (PLQY) of the resulting QDs were found to be depended on the type of thiol and pH. The MPA capped QDs synthesized at pH 11.0 exhibited the high PLQY among other thiol capped QDs. The size of the QDs was calculated to be ~3 nm by XRD analysis, which is consistent with TEM results. The possible mechanism of the core/shell formation is also presented.

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Acknowledgements

The part of this work was financially supported by Department of Biotechnology (DBT-Nanomedicine), Government of India (Grant No: BT/PR10085/NNT/ 28/99/2007). The authors also acknowledge the assistance from National Centre for Nanoscience and Nanotechnology (NCNSNT), University of Madras, Chennai for TEM and XPS analyses.

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Authors and Affiliations

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

    Sundararajan Parani, Ncediwe Tsolekile & Oluwatobi Samuel Oluwafemi

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

    Sundararajan Parani, Ncediwe Tsolekile & Oluwatobi Samuel Oluwafemi

  3. Department of Inorganic Chemistry, University of Madras, Maraimalai (Guindy) Campus, Chennai, 600 025, India

    Kannaiyan Pandian

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  1. Sundararajan Parani
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  2. Ncediwe Tsolekile
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  3. Kannaiyan Pandian
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  4. Oluwatobi Samuel Oluwafemi
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Correspondence to Oluwatobi Samuel Oluwafemi.

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Parani, S., Tsolekile, N., Pandian, K. et al. Thiolated selenium as a new precursor for the aqueous synthesis of CdSe/CdS core/shell quantum dots. J Mater Sci: Mater Electron 28, 11151–11162 (2017). https://doi.org/10.1007/s10854-017-6902-x

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  • DOI: https://doi.org/10.1007/s10854-017-6902-x

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