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

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Abstract

A sensitive ratiometric fluorescent sensor for detecting cadmium ions (Cd2+) 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 Cd2+ 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 Cd2+ in real rice samples. In addition, a fluorescent sensor integrated with a smartphone platform was further designed for the visualized and quantitative detection of Cd2+. This work might extend the range of visualization analysis strategies and provide new insights into the rapid quantitative, portable and sensitive detection of Cd2+ in real-time and on-site applications.

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Ai, Q., Dong, Y., Yu, X., Wei, P., Zhang, D., & Qiu, S. (2023). Sensitive detection of cadmium ions based on a quantum-dot-mediated fluorescent visualization sensor. RSC Advances, 13(37), 25912–25919. https://doi.org/10.1039/d3ra04255c

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