还原石墨烯-碳纳米管-金纳米复合物的电化学发光过氧化氢传感器

An ECL sensor for hydrogen peroxide using reduced graphene oxide-multiwall carbon nanotubes-gold nanocomposites modified electrode

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^-2-1.4×10^2μmol/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。

A novel electrochemiluminescence （ECL） sensor based on luminol 1 for detection of hydrogen peroxide （H2O2 ） was proposed using gold nanoparticles functionalized reduced graphene oxide-multiwall carbon nanotubes （AuNPs-rGO-CNTs） nanocomposites modified glassy carbon electrode （GCE） for the first time. The AuNPs-rGO-CNTs nanocomposites were prepared by a facile and green in-situ chemical reaction which employed polyethyleneimine （PEI） as the reductant for GO-CNTs and AuCl4-reduction. Acting as the coreactant of luminol ECL, H2O2 carl greatly enhance the ECL signal of luminol. Cyclic voltammetry was employed to characterize the modification processes of the sensor. Under the optimal conditions, the ECL signal intensity of luminol was linear with the concentration of n2O2 in the range of 3.4 10-2 -1.4 102 μmol/L （R =0. 9935） with a detection limit （S/N =3） of 1.1 10-2 μmol/L.