Non-covalently functionalised rGO–fluorescein unit for selective detection of fluoride ions

The combination of reduced Graphene oxide and Fluorescein dye serves as a highly selective optical switch for sensing fluoride ion via colorimetric and fluorimetric modes. A turn off stage viz., quenching of optical signal of fluorescein was observed by the formation of a supramolecular assembly bet...

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Bibliographic Details
Published in:Nano-Structures & Nano-Objects 2020-10, Vol.24, p.100606, Article 100606
Main Authors: Anju, M., Akhila, A.K., Renuka, N.K.
Format: Article
Language:English
Subjects:
Fluorescein
Fluoride ion
Optical sensor
Reduced graphene oxide
Strip sensing
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Summary:The combination of reduced Graphene oxide and Fluorescein dye serves as a highly selective optical switch for sensing fluoride ion via colorimetric and fluorimetric modes. A turn off stage viz., quenching of optical signal of fluorescein was observed by the formation of a supramolecular assembly between reduced graphene oxide (host matrix) and the dye (indicator). This OFF stage was turned ON instantly with the advent of fluoride ion (guest), with high selectivity. The limit of detection values obtained are 4.2 ppm and 1.7 ppb respectively, via colourimetric and fluorimetric strategy. Solid state test strips of the sensor unit could detect fluoride in aqueous media at concentration down to 3 ppm with the help of UV source. [Display omitted] •Colorimetric and fluorimetric detection of fluoride ion using rGO–fluorescein​ system.•Limit of detection of 4.2 ppm and 1.7 ppb respectively, for these two methods.•High selectivity of the sensor towards F- ions over other anions.•Fabrication of paper strips for the detection of fluoride ion at concentration down to 3 ppm with the help of UV source.
ISSN:2352-507X
DOI:10.1016/j.nanoso.2020.100606