无金属可见光诱导原子转移自由基聚合法制备聚丙烯酰胺@氧化石墨烯/纳米钯复合物修饰电极及其对乙醇的检测

在金电极表面,用无金属可见光诱导原子转移自由基聚合(MVL ATRP)的方法制备聚丙烯酰胺@氧化石墨烯/纳米钯复合物修饰电极(Au/PAM@GO/Pd)。采用电化学循环伏安法(CV)、交流阻抗法(EIS)、扫描电子显微镜(SEM)、能量色散X射线光谱法(EDS)对Au/PAM@GO/Pd电极进行表征,结果表明在金电极表面成功制备了复合物。利用Au/PAM@GO/Pd电极作为电化学传感器,该传感器能成功地检测溶液中的乙醇。在最佳条件下,利用差分脉冲伏安法(DPV)该传感器检测乙醇的线性范围为1.0×10-8~1.0 mol/L,检出限(S/N=3)为1.3×10-9 mol/L,线性相关系数为0.996。

Preparation of Au/Polyacrylamide@Graphene Oxide/Nano-palladium Electrode via Metal-Free Visible-Light-Induced Atom Transfer Radical Polymerization and Its Detection of Ethanol

Polyacrylamide@graphene oxide/nano-palladium composite was prepared on the surface of gold electrode (Au/PAM@GO/Pd) by metal-free visible light-induced atom transfer radical polymerization (MVL ATRP). The Au/PAM@GO/Pd electrode was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS),scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that the composite is successfully prepared on the surface of the gold electrode. The Au/PAM@GO/Pd electrode could be used as an electrochemical sensor to detect ethanol by differential pulse voltammetry (DPV). Under the optimal conditions, the linear range is 1.0×10^-8~1.0 mol/L, and the detection limit (S/N=3) is 1.3×10^-9 mol/ L, with a coefficient of 0.996.