Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu St., 011061 Bucharest, Romania.
Faculty of Applied Sciences, University Politehnica of Bucharest, 313 Splaiul Independenţei, 060042 Bucharest, Romania.
Sensors (Basel). 2020 Nov 28;20(23):6799. doi: 10.3390/s20236799.
A new thiosemicarbazone ligand was immobilized through a Cu(I)-catalyzed click reaction on the surface of glassy carbon (GC) and electrochemically reduced graphene oxide (GC-ERGO) electrodes grafted with phenylethynyl groups. Using the accumulation at open circuit followed by anodic stripping voltammetry, the modified electrodes showed a significant selectivity and sensibility for Hg(II) ions. A detection limit of 7 nM was achieved with the GC modified electrodes. Remarkably, GC-ERGO modified electrodes showed a significantly improved detection limit (0.8 nM), sensitivity, and linear range, which we attribute to an increased number of surface binding sites and better electron transfer properties. Both GC and GC-ERGO modified electrodes proved their applicability for the analysis of real water samples.
一种新型的硫代半卡巴腙配体通过 Cu(I) 催化点击反应固定在玻璃碳 (GC) 和接枝苯乙炔基的电化学还原氧化石墨烯 (GC-ERGO) 电极表面。通过开路累积和阳极溶出伏安法，修饰电极对 Hg(II) 离子表现出显著的选择性和灵敏度。GC 修饰电极的检测限达到 7 nM。值得注意的是，GC-ERGO 修饰电极的检测限（0.8 nM）、灵敏度和线性范围显著提高，这归因于表面结合位点数量的增加和更好的电子传递性能。GC 和 GC-ERGO 修饰电极均证明了它们在实际水样分析中的适用性。
