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Barbituric acid-modified graphitic carbon nitride nanosheets for ratiometric fluorescent detection of Cu2+

Abstract

In this work, barbituric acid-modified graphitic carbon nitride (BCN) nanosheets with blue-green fluorescence were prepared by a copolymerization of dicyandiamide with barbituric acid and then by a chemical oxidation process. A ratiometric fluorescence sensor for Cu2+ was designed by using BCN nanosheets as the report probe and Ru(bpy)3Cl2 as the reference probe. In the presence of different concentrations of Cu2+, the blue-green fluorescence of BCN nanosheets was drastically quenched, while the red fluorescence of Ru(bpy)3Cl2 kept constant. The color of the sensor changed from blue-green to red, resulting in ratiometric and visual detection of Cu2+ ion. The detection limit for Cu2+ was estimated to be 70 nM, as low as 5 μM Cu2+ was distinguished by naked eyes. Additionally, this sensor was also applied for the detection of Cu2+ in tap water samples.

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Publication details

The article was received on 26 Dec 2017, accepted on 09 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7AN02089A
Citation: Analyst, 2018, Accepted Manuscript
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    Barbituric acid-modified graphitic carbon nitride nanosheets for ratiometric fluorescent detection of Cu2+

    L. Chen, Z. Song, X. Liu, L. Guo, M. Li and F. Fu, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C7AN02089A

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