ABSTRACT

Major electrochemi luminescence (ECL) sensors implement the detection of the target according to the change ofsingle signal, and the results often appear false signals to reduce the accuracy. In this work, dual-potential EClsystem was constructed for the detection of glucose with luminol as anodic ECL. emitter while graphitic carbonnitrides (g-CgNy) as cathodie ECL emitter. The cavity of cucurbit[6]uril (0[6l) was facile for the immobilizationof oxygen on the electrode surface, which could further react with luminol to generate strong anodic ECL. WithK,S,Og as the co-reactant, the cathodic ECL, was obtained with g-C3N4 as the light emitter. When glucose oxidase(GOD) was fixed onto the electrode by electrostatic interaction with g-C3N4, the ECL signal decreased due to thepoor conductivity of GOD. In the presence of glucose, H,O, could be generated during the oxidation of glucosecatalyzed GOD, leading to the recovery of ECL. Based on the variation of ECL signal, a sensor for glucose wasproposed, Under the optimal condition, the concentration of glucose and the variation of ECl intensity showed agood linear relationship in the range of 1.0 ulM-1.0 mM, and the detection limit was determined as 0.697 u M foranodie ECL and 0.458 u M for cathodic ECL, respectively. The result not only improved the accuracy of glucosedetection, but also expanded the application of Q[6] and g-C3N4 in ECL sensing field.