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以聚乙烯亚胺(PEI)为还原剂,采用一步还原法制备纳米金修饰的还原石墨烯-碳纳米管(AuNPs-rGO-CNTs)复合纳米材料。PEI同时作为交联试剂,使得AuNPs-rGO-CNTs复合物具有良好的成膜性质,能均匀的修饰到玻碳电极表面,制得AuNPs-rGO-CNTs修饰电极。基于过氧化氢(H2O2)作为鲁米诺-电化学发光(鲁米诺-ECL)体系的共反应试剂能显著增强鲁米诺的电化学发光信号,构建了AuNPs-rGO-CNTs复合物修饰的玻碳电极用于电化学发光测定H2O2的新方法。实验采用循环伏安法对传感器的修饰过程进行了表征。对测试底液中鲁米诺的浓度、pH等条件进行了优化,在最优实验条件下,该传感器的电化学发光信号强度与H2O2浓度在3.4×10-2~1.4×102μmol/L范围内呈良好的线性关系,检出限为1.1×10-2μmol/L。传感器适用于H2O2的测定。
Polyethyleneimine (PEI) was used as reductant to prepare AuNPs-rGO-CNTs nanocomposites by one-step reduction. PEI as a cross-linking reagent at the same time, AuNPs-rGO-CNTs composite with good film-forming properties can be uniformly modified to the surface of glassy carbon electrode to prepare AuNPs-rGO-CNTs modified electrode. Hydrogen peroxide (H2O2) as a luminol-electrochemiluminescence (luminol-ECL) system co-reaction reagent can significantly enhance the luminol electrochemiluminescence signal to build the AuNPs-rGO-CNTs complex modified Glassy Carbon Electrode for Electrochemiluminescence Determination of H2O2 New Method. Cyclic voltammetry was used to characterize the sensor modification process. The conditions of luminol concentration and pH in the test solution were optimized. Under the optimal experimental conditions, the electrochemiluminescence signal intensity and H2O2 concentration of the sensor ranged from 3.4 × 10-2 to 1.4 × 102μmol / L Showed a good linear relationship with a detection limit of 1.1 × 10-2μmol / L. The sensor is suitable for the determination of H2O2.