Sensitive detection of cadmium ions based on a quantum-dot-mediated fluorescent visualization sensor

A sensitive ratiometric fluorescent sensor for detecting cadmium ions (Cd 2+ ) was constructed based on carbon quantum dots (CQDs)/CdTe quantum dots (CdTe QDs). Red fluorescence (from CdTe QDs) played the role of the signal response and blue fluorescence (from CQDs) served as a reference probe witho...

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Bibliographic Details
Published in:RSC advances 2023-08, Vol.13 (37), p.25912-25919
Main Authors: Ai, Qiushuang, Dong, Yifan, Yu, Xiren, Wei, Peiling, Zhang, Dawen, Qiu, Suyan
Format: Article
Language:English
Subjects:
Cadmium
Cadmium tellurides
Chemistry
Fluorescence
Quantum dots
Visualization
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Summary:A sensitive ratiometric fluorescent sensor for detecting cadmium ions (Cd 2+ ) was constructed based on carbon quantum dots (CQDs)/CdTe quantum dots (CdTe QDs). Red fluorescence (from CdTe QDs) played the role of the signal response and blue fluorescence (from CQDs) served as a reference probe without a color change. The fluorescent sensor showed high selectivity and sensitivity to Cd 2+ with a limit of detection (LOD) of 0.018 μM and a range from 0.1 μM to 23 μM. The proposed method was successfully applied to the determination of Cd 2+ in real rice samples. In addition, a fluorescent sensor integrated with a smartphone platform was further designed for the visualized and quantitative detection of Cd 2+ . This work might extend the range of visualization analysis strategies and provide new insights into the rapid quantitative, portable and sensitive detection of Cd 2+ in real-time and on-site applications. A sensitive ratiometric fluorescent sensor for detecting cadmium ions (Cd 2+ ) was constructed based on carbon quantum dots (CQDs)/CdTe quantum dots (CdTe QDs).
ISSN:2046-2069
2046-2069
DOI:10.1039/d3ra04255c