Issue 20, 2021

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

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

Supplementary files

Article information

Article type
Paper
Submitted
14 Mar 2021
Accepted
13 Apr 2021
First published
14 Apr 2021

Anal. Methods, 2021,13, 2297-2304

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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