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Coumarin–graphene turn-on fluorescent probe for femtomolar level detection of copper(II)

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Abstract

Herein, a coumarin–graphene based turn-on fluorescence strategy is proposed for the detection of Cu2+ ions. The interaction of graphene with coumarin reduces the luminescence of the latter and together they constitute a sensor unit. The reduced intensity is restored in the presence of Cu2+ ions owing to the greater affinity of the Cu2+ ions to the graphene compared to coumarin. The proposed mechanism was verified by the reduction of the enhanced luminescence when in contact with a strong complexing agent, EDTA. The sensor displays an outstanding sensitivity and selectivity towards Cu2+ ions over other metal ions in aqueous solution. Under optimised conditions, the calibration curve displays a wide linear range (0–20 μM) with a limit of detection of 2 femto molar, which is far below the regulatory level, and admirable when compared to other previously reported systems.

Graphical abstract: Coumarin–graphene turn-on fluorescent probe for femtomolar level detection of copper(ii)

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Publication details

The article was received on 17 Sep 2018, accepted on 01 Dec 2018 and first published on 03 Dec 2018


Article type: Paper
DOI: 10.1039/C8NJ04732D
Citation: New J. Chem., 2019, Advance Article
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    Coumarin–graphene turn-on fluorescent probe for femtomolar level detection of copper(II)

    A. K. Akhila and N. K. Renuka, New J. Chem., 2019, Advance Article , DOI: 10.1039/C8NJ04732D

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