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Investigation of Heavy Atom Effect on Fluorescence of Carbon Dots: NCDs and S,N-CDs

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Abstract

The present work is an attempt to investigate the heavy atom effect imparted by halide ions, especially iodide (I−) ions on the fluorescence behavior of carbon dots (CDs). Here two different types of CDs viz. nitrogen doped carbon dots (NCDs) from Citric Acid (CA) & Urea and Sulfur and nitrogen co-doped carbon dots (S,N-CDs) from CA & L-Cysteine were synthesized and the fluorescence of both CDs were quenched by heavy atom effect on adding potassium iodide (KI). The large difference in average lifetime was obtained in time-correlated single-photon counting (TCSPC) analysis suggests the dynamic quenching and heavy atom effect.

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Acknowledgements

The authors are deeply grateful to the Professor and Head, Department of Chemistry, University of Kerala for the generous support, laboratory, and instrumental facilities. The authors acknowledge DST-FIST, Government of India; CLIF, University of Kerala, Thiruvananthapuram, India; and STIC, CUSAT, Kochi, India for the sophisticated characterisation techniques provided for this research work. The authors also acknowledge SAIF, MGU, Kottayam, India for TCSPC analysis.

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  1. Department of Chemistry, School of Physical and Mathematical Sciences, Research Centre, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala, 695581, India

    A. O. Aswathy, S. Madanan Anju, J. Jayakrishna, N. S. Vijila, J. S. Anjali Devi, B. Anjitha & Sony George

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  1. A. O. Aswathy
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  2. S. Madanan Anju
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Correspondence to Sony George.

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Aswathy, A.O., Anju, S.M., Jayakrishna, J. et al. Investigation of Heavy Atom Effect on Fluorescence of Carbon Dots: NCDs and S,N-CDs. J Fluoresc 30, 1337–1344 (2020). https://doi.org/10.1007/s10895-020-02607-x

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