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Issue 17, 2017
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Electrochemiluminescence assay of Cu2+ by using one-step electrodeposition synthesized CdS/ZnS quantum dots

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Abstract

A sensitive and selective method was proposed to detect Cu2+ based on the electrochemiluminescence quenching of CdS/ZnS quantum dots (QDs). Herein, CdS/ZnS QDs were one-step electrodeposited directly on a gold electrode from an electrolyte (containing Cd(NO3)2, Zn(NO3)2, EDTA and Na2S2O3) by cycling the potential from 0 to −1.8 V. The prepared CdS/ZnS QDs exhibited excellent solubility and strong and stable cathodic ECL activity. Meanwhile, Nafion was used to immobilize CdS/ZnS QDs. The quenching effect of Cu2+ on the cathodic ECL of CdS/ZnS QDs was found to be selective and concentration dependent. The linear range for Cu2+ detection was from 2.5 nM to 200 nM with a detection limit of 0.95 nM. Furthermore, the designed method for the detection of Cu2+ can provide a reference for the detection of other heavy metal ions.

Graphical abstract: Electrochemiluminescence assay of Cu2+ by using one-step electrodeposition synthesized CdS/ZnS quantum dots

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Publication details

The article was received on 18 Jun 2017, accepted on 18 Jul 2017 and first published on 19 Jul 2017


Article type: Paper
DOI: 10.1039/C7AN01014A
Citation: Analyst, 2017,142, 3272-3277
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    Electrochemiluminescence assay of Cu2+ by using one-step electrodeposition synthesized CdS/ZnS quantum dots

    G. Zhao, X. Li, Y. Zhao, Y. Li, W. Cao and Q. Wei, Analyst, 2017, 142, 3272
    DOI: 10.1039/C7AN01014A

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