Ag纳米粒子修饰的玻碳电极及对甲醛的检测研究

Preparation of Ag Modified Glassy Carbon Electrode and Research on Formaldehyde Detection

采用三乙醇胺化学还原制备Ag纳米颗粒,尺寸约为108±6 nm,将其修饰到玻碳电极上作为甲醛的电催化氧化电极。电化学研究结果发现,Ag纳米粒子可提高玻碳电极的电化学活性表面积,并改善对甲醛的电催化氧化作用。在碱性介质中,氧化峰电流与甲醛浓度呈良好的线性关系,检出限可达9.4×10^(-5) mol/L,且多次测量中甲醛氧化峰电流相对标准偏差仅为6.8%,显示出良好的稳定性和实用性。

Ag nanoparticles with the size about 108±6 nm was prepared by chemical reduction with triethanolamine, which was dipped onto the glassy carbon electrode （GCE） to prepare catalytic oxidation electrode towards formaldehyde. The electrochemical results showed that Ag nanoparticles enhanced the electrochemical active surface and improve the catalytic oxidation activity to formaldehyde. According to the analysis in alkaline solution, the oxidative peak current and the concentration of forrnaldehyde showed a good linear relationship, the detection limit is 9.4×10^5 tool/L, the relative standard deviation of oxidative peak current obtained from the repeated measurements is just 6.8 %. These results demonstrate that Ag modified GCE exhibits good stability and practicability.