ScholarWorks@성균관대학교

초록

Traditional electrochemiluminescence (ECL) emitters exhibit poor stability when co-reactants are introduced into the electrolyte, thus affecting the accuracy of the test. The self-luminous electrochemiluminescent emitters can effectively immobilize the co-reactant on their surfaces while minimizing the electron transfer distance, ultimately leading to significantly enhanced luminescence efficiency. Herein, a novel self-luminous anodic emitter, i.e., tris(4,4′-diethylaminobipyridine)ruthenium(II) chloride (RuDEDA), was synthesized via a condensation reaction between Ru(dcbpy)32 + and N,N-diethylethylenediamine (DEDA), which is a ruthenium(II) tris(bipyridine) derivative. Graphdiyne (GDY) was used as the substrate for the electroless deposition of Pd nanoparticles (Pd@GDY). The alkyne bonds in GDY can modulate the electronic properties of the supported metal atoms, increase the rate of conversion of RuDEDA into RuDEDA•, and further improve the ECL efficiency. Next, an electrochemical sensor for the ultrasensitive detection of kanamycin was fabricated using Pd@GDY as the substrate material. The self-luminous ECL emitter in the sensing system integrates the entire analytical process, thereby effectively reducing the occurrence of false positives/negatives and simplifying the sensing procedure. The results revealed that ECL efficiency gradually increased with the amount of immobilized co-reactant. Under appropriate experimental conditions, the detection range of this sensor is 0.1 pmol L−1 – 1 μmol L−1, with a limit of detection (LOD) of 0.008 pmol L−1. This sensor has a low LOD and a wide linear range, providing a new approach for environmental monitoring and safeguarding public health.

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