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Issue 20, 2021
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Anodic near-infrared electrochemiluminescence from Cu-doped CdTe quantum dots for tetracycline detection

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Abstract

A sensitive anodic near-infrared electrochemiluminescence (ECL) immunosensor for the detection of tetracycline, based on Cu-doped CdTe quantum dots, was fabricated for the first time in this work. We have synthesized Cu-doped CdTe quantum dots by co-precipitation. The emission spectrum of the Cu-doped CdTe quantum dots could reach the near-infrared region at 730 nm in a short reflux time. More importantly, the ECL intensity of the CdTe quantum dots was enhanced by 2 fold after Cu element doping, which was attributed to the Cu d-orbital mixed with the conduction band and valence band of the host CdTe quantum dots. Inspired by the strong anodic ECL intensity of Cu-doped CdTe quantum dots, the anodic near infrared ECL sensor was constructed to detect tetracycline by competitive immunoassay. The detection range of the developed biosensor was 0.01–10 ng mL−1 and the detection limit was 0.0030 ng mL−1. In addition, the biosensor showed outstanding selectivity, long-term stability and high reproducibility, which has great potential in the field of analysis and detection.

Graphical abstract: Anodic near-infrared electrochemiluminescence from Cu-doped CdTe quantum dots for tetracycline detection

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Supplementary files

Article information


Submitted
14 Mar 2021
Accepted
13 Apr 2021
First published
14 Apr 2021

Anal. Methods, 2021,13, 2297-2304
Article type
Paper

Anodic near-infrared electrochemiluminescence from Cu-doped CdTe quantum dots for tetracycline detection

Z. Li, M. Wu and S. Ding, Anal. Methods, 2021, 13, 2297
DOI: 10.1039/D1AY00428J

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