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Issue 26, 2017
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A novel turn-on fluorescent sensor for highly selective detection of Al(iii) in an aqueous solution based on simple electrochemically synthesized carbon dots

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Abstract

In this study, a simple and sensitive turn on fluorescent sensor for the detection of Al3+ ion in an aqueous solution was developed based on carbon dots (C-dots) obtained via one-step electrolysis of graphite in sodium hydroxide aqueous solution. The as-prepared C-dots exhibit excellent photoluminescence and up-conversion photoluminescence properties and have an average size of 5.0 nm. The as-prepared C-dots showed a light green luminescence emission under 365 nm ultraviolet excitation and could be used as a novel label-free turn on fluorescent probe for the selective detection of Al3+; this is quite different from the case of usual quenching effects of metal ions on fluorescent C-dots. The fluorescence enhancement effect of Al3+ ion on the as-prepared C-dots could be attributed to the chelation-enhanced fluorescence (CHEF) mechanism. Abundant oxygen functional groups on the surface of C-dots have chelation interaction with Al3+ and increase the rigidity of the C-dots, leading to fluorescence enhancement. Moreover, the as-prepared C-dots are highly selective for Al3+ over other metal ions, with a detection limit of 0.05 μM, and the linear relationship between fluorescence intensity and concentration of Al3+ is in the range of 0.1–7.2 μM. In addition, the as-prepared novel fluorescent probe was successfully applied for the direct analysis of Al3+ in a real environmental water sample.

Graphical abstract: A novel turn-on fluorescent sensor for highly selective detection of Al(iii) in an aqueous solution based on simple electrochemically synthesized carbon dots

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Article information


Submitted
03 May 2017
Accepted
05 Jun 2017
First published
06 Jun 2017

Anal. Methods, 2017,9, 3941-3948
Article type
Paper

A novel turn-on fluorescent sensor for highly selective detection of Al(III) in an aqueous solution based on simple electrochemically synthesized carbon dots

X. Fu, J. Jin, J. Wu, J. Jin and C. Xie, Anal. Methods, 2017, 9, 3941
DOI: 10.1039/C7AY01137G

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