Electrochemiluminescence Sensor for Phosphate Ions Based on Europium(III)‐Modulated CdSe Quantum Dots

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 Eu3+ 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 Eu3+ 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.

Nozzle-Jet-Printed Silver/Graphene Composite-Based Field-Effect Transistor Sensor for Phosphate Ion Detection

“…13−20 Several optical methods including fluorescence and luminescence methods have been reported to detect orthophosphates with an accuracy of up to ∼0.01 mg/L only. 21−25 Although these methods express high limit of detection (LOD), they are still considered to be very tedious approaches. In the past, electrochemical amperometric sensors comprised of Ni, carbon black, and Co electrodes have been developed for phosphate detection.…”

“…Significant efforts have been made to fabricate sensors for the development of phosphate-selective electrodes using several electroanalytical techniques. − Several optical methods including fluorescence and luminescence methods have been reported to detect orthophosphates with an accuracy of up to ∼0.01 mg/L only. − Although these methods express high limit of detection (LOD), they are still considered to be very tedious approaches. In the past, electrochemical amperometric sensors comprised of Ni, carbon black, and Co electrodes have been developed for phosphate detection. − Although the electrochemical method shows promising results, it suffers from some drawbacks such as low stability, electrode fabrication, and need of a reactive surface for phosphate ion detection.…”