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Coumarin-Graphene Turn-On Fluorescence probe for Femtomolar Level Detection of Copper (II)

Abstract

Coumarin-Graphene based Turn-On fluorescence strategy is proposed herein, for the detection of Cu2+ ions. The interaction of graphene with coumarin lowers the luminescence of the latter and the two together constitute the sensor unit. The reduced intensity is restored in presence of Cu2+ ions due to the higher affinity of the said ions towards graphene over coumarin. The proposed mechanism is justified 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 the optimised conditions, calibration curve displays a wide linear range (0-20 μM) with limit of detection 2 femto molar which is far below the regulatory level, and admirable when compared to other reported systems.

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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., 2018, Accepted Manuscript
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    Coumarin-Graphene Turn-On Fluorescence probe for Femtomolar Level Detection of Copper (II)

    A. A. K. and R. N. K. Neeroli, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ04732D

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