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Enhanced Electrochemiluminescence From Reduced Graphene Oxide-CdTe Quantum Dots For Highly Selective Determination Of Copper Ion.

F. Hu, Juanli Wang, Shihong Chen, Qianghai Rao
Published 2019 · Materials Science, Medicine

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An electrochemiluminescence (ECL) sensor based on reduced graphene oxide-CdTe quantum dots (RGO-CdTe QDs) composites for detecting copper ion (Cu2+ ) was proposed. The ECL behaviours of the RGO-CdTe QD modified electrode were investigated with H2 O2 as the co-reactant. Quantitative detection of Cu2+ was realized as Cu2+ could effectively quench the ECL signal of the RGO-CdTe QDs. A wide linear range of 1.00 × 10-14 to 1.00 × 10-4  M (R = 0.9953) was obtained under optimized conditions, and a detection limit (S/N = 3) was achieved of as low as 3.33 × 10-15  M. The proposed sensor also exhibited good stability and selectivity for the detection of copper ions. Finally, the analytical application of the proposed sensor was also evaluated using river water.
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