Microwave-assisted synthesis of thymine-functionalized graphitic carbon nitride quantum dots as a fluorescent nanoprobe for mercury(II)

Ojodomo J. Achadu, Neerish Revaprasadu

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23 Citations (Scopus)

Abstract

A microwave-assisted hydrothermal method was employed to prepare thymine-modified graphitic carbon nitride quantum dots (T-gCNQDs) which are shown to be a novel fluorescent nanoprobe for Hg(II). They exhibit excellent optical properties (blue emission with a fluorescence quantum yield of 46%) and water solubility. The incorporation of thymine into the gCNQDs results in an enhancement in photoluminescence properties. It is found that fluorescence, best measured at excitation/emission wavelengths of 350/445 nm, is much more strongly quenched by Hg(II) compared to the thymine-free nanoprobe. The quenching is highly selective even in the presence other metal ions. This is ascribed to the formation of T-Hg(II)-T base complexes. Fluorescence drops linearly in the 1.0 to 500 nM Hg(II) concentration range, and the limit of detection is 0.15 nM. The method was applied to the determination of Hg(II) in spiked samples of tap and pond water. Recoveries were found to be >95%, thus demonstrating the practical applicability of the assay. [Figure not available: see fulltext.].

Original languageEnglish
Article number461
JournalMicrochimica Acta
Volume185
Issue number10
DOIs
Publication statusPublished - 15 Sep 2018

Bibliographical note

Funding Information:
Acknowledgements The authors acknowledge the National Research Foundation (NRF), South Africa through the South African Research Chair Initiative (SARChI). OJA thanks the National Research Foundation (NRF) for a postdoctoral fellowship and funding under SA Research Chair for Nanotechnology.

Publisher Copyright:
© 2018, Springer-Verlag GmbH Austria, part of Springer Nature.

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