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Issue 8, 2014
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“Turn-on” fluorescent detection of cyanide based on polyamine-functionalized carbon quantum dots

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Abstract

A simple, sensitive, rapid fluorescence (FL) sensor has been developed to detect cyanide ions (CN) based on the branched polyethylenimine-capped carbon quantum dots (BPEI-GQDs). The amino groups at the surfaces of BPEI-GQDs can selectively and sensitively capture copper ions (Cu2+) to form absorbent cupric amine, which can quench the FL of BPEI-GQDs through an inner filter effect. CN can combine strongly with Cu2+ to [Cu(CN)x]n species, preventing Cu2+ from being captured by the amino groups of BPEI-GQDs. As a result, Cu2+ can't quench the FL of BPEI-GQDs anymore in the presence of CN. In other words, CN can “turn on” the FL signal of BPEI-GQDs/Cu2+ system, producing a “recovered” FL signal. After optimizing experimental conditions, we demonstrated that this easy methodology could offer a sensitive, selective, simple and rapid method for detection of CN with a detection limit of 0.65 μM (S/N = 3) and a linear response range of 2 to 200 μM.

Graphical abstract: “Turn-on” fluorescent detection of cyanide based on polyamine-functionalized carbon quantum dots

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Article information


Submitted
17 Oct 2013
Accepted
13 Nov 2013
First published
15 Nov 2013

RSC Adv., 2014,4, 3701-3705
Article type
Paper

“Turn-on” fluorescent detection of cyanide based on polyamine-functionalized carbon quantum dots

Y. Dong, R. Wang, W. Tian, Y. Chi and G. Chen, RSC Adv., 2014, 4, 3701
DOI: 10.1039/C3RA45893H

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