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Electrochemiluminescence Sensor for Phosphate Ions Based on Europium(III)‐Modulated CdSe Quantum Dots
Author(s) -
Li QiLe,
Bao Ning,
Ding ShouNian
Publication year - 2014
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400355
Subject(s) - electrochemiluminescence , quantum dot , europium , ion , phosphate , detection limit , quenching (fluorescence) , chemistry , inorganic chemistry , selectivity , photochemistry , materials science , nanotechnology , fluorescence , physics , organic chemistry , chromatography , catalysis , quantum mechanics
Abstract Phosphate anions are determined based on the electrochemiluminescence (ECL) of CdSe quantum dots (CdSe QDs) capped with 3‐mercaptopropionic acid. The ECL gets quenched with the introduction of Eu 3+ ions, but it is restored on the further addition of phosphate anions. The sensing mechanism might be due to the strong and specific interaction between phosphate anions and the Eu 3+ ions, leading to the releasing of CdSe QDs from aggregates. On the basis of the quenching/recovery ECL behaviors, the ECL sensor offer acceptable sensitivity, high selectivity, and a linear response from 0.1 to 120 µM with a detection limit of 0.03 µM (3δ) for phosphate anions.