Conjugated polymer dots/oxalate anodic electrochemiluminescence system and its application for detecting melamine

Abstract

In this work, the anodic electrochemiluminescence (ECL) behavior of water-soluble poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO), is firstly studied with Na₂C₂O₄ as a coreactant using cyclic voltammetry and ECL measurements. The possible anodic ECL mechanism of PFO–C₂O₄²⁻ system is proposed. Based on the fact that the melamine could efficiently quench the ECL signal of the PFO–C₂O₄²⁻ system, a new ECL sensing method for melamine was developed with a wide linear range from 9.0 × 10⁻¹¹ to 1.1 × 10⁻⁸ M. Furthermore, the sensor exhibited high sensitivity and good stability. Due to the excellent ECL behavior, the PFO–C₂O₄²⁻ system could be a promising platform for constructing ECL sensors.