An "off-on" Fluorescent Nanosensor for the Detection of Cadmium Ions Based on APDC-etched CdTe/CdS/SiO Quantum Dots

Overview

Journal Heliyon

Specialty Social Sciences

Date 2024 Mar 11

PMID 38463779

Authors

Jiaqian Chen

Haimei Meng

Zhijia Fang

Iddrisu Lukman

Jialong Gao

Jianmeng Liao

Qi Deng

Lijun Sun

Ravi Gooneratne

Affiliations

Soon will be listed here.

Abstract

In this study, we have developed a novel fluorescent "OFF-ON" quantum dots (QDs) sensor based on CdTe/CdS/SiO cores. Ammonium pyrrolidine dithiocarbamate (APDC), ethylenediamine tetraacetic acid (EDTA), and 1,10-phenanthroline (Phen) served as potential chemical etchants. Among these three etchants, APDC exhibited the most pronounced quenching effect (94.06%). The APDC-etched CdTe/CdS/SiO QDs demonstrated excellent optical properties: the fluorescence of the APDC-etched CdTe/CdS/SiO QDs system (excitation wavelength: 365 nm and emission wavelength: 622 nm) was significantly and selectively restored upon the addition of cadmium ions (Cd) (89.22%), compared to 15 other metal ions. The linear response of the APDC-etched CdTe/CdS/SiO QDs was observed within the cadmium ion (Cd) concentration ranges of 0-20 μmol L and 20-160 μmol L under optimized conditions (APDC: 300 μmol L, pH: 7.0, reaction time: 10 min). The detection limit (LOD) of the APDC-etched CdTe/CdS/SiO QDs for Cd was 0.3451 μmol L in the range of 0-20 μmol L. The LOD achieved by the QDs in this study surpasses that of the majority of previously reported nanomaterials. The feasibility of using APDC-etched CdTe/CdS/SiO QDs for Cd detection in seawater, freshwater, and milk samples was verified, with average recoveries of 95.27%-110.68%, 92%-106.47%, and 90.73%-111.60%, respectively, demonstrating satisfactory analytical precision (RSD ≤ 8.26).

Citing Articles

Synergistic Interactions of Metals and Quantum Dots: Expanding Frontiers in Fluorescent Sensing.

Archana P, Vasudevan S, Panicker U J Fluoresc. 2025; .

PMID: 39985617 DOI: 10.1007/s10895-025-04144-x.

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