The development of low-cost earth abundant metal based fluorescent sensors for a rapid and selective nanomolar level detection of Hg is essential due to the increasing world-wide concern of its detrimental effect on humans as well as the environment. Herein, we present a perylene tetracarboxylic acid functionalized copper nanoclusters (CuNCs) based "turn-on" fluorescence probe for highly selective detection of toxic Hg ions. The fabricated CuNCs exhibited high photostability with emission maximum centered at 532 nm (λ = 480 nm). The fluorescence intensity of CuNCs was remarkably enhanced upon the addition of Hg over other competing ions and neutral analytes. Notably, the 'turn-on' fluorescence response exhibits highly sensitive detection limit as low as 15.9 nM (S/N ∼ 3). The time resolved fluorescence spectroscopy suggested the energy transfer between CuNCs and Hg ions following either inhibited fluorescence resonance energy transfer (FRET) or surface modification of CuNCs during Hg sensing. This study offers the systematic design and development of new fluorescent 'turn-on' nanoprobes for rapid and selective recognition of heavy metal ions.
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| http://dx.doi.org/10.1016/j.saa.2023.122697 | DOI Listing |
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