"turn-on" fluorescent detection of cyanide based on polyamine-functionalized carbon quantum dots

  • Dong Y
  • Wang R
  • Tian W
 et al. 
  • 19

    Readers

    Mendeley users who have this article in their library.
  • 36

    Citations

    Citations of this article.

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.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free