Nano-branched Silver Dendrites Modified Glassy Carbon Electrode for Detection of Heavy Metal Ions

摘要

Silver dendrites were fabricated on platinum mesh by electro-deposition in pure AgNO 3 solution. Thedendritic silver powders with nano-branches were obtained after the platinum mesh treated byultrasonic process. After characterized by Field-emitting Scanning Electron Microscopy (FE-SEM) andX-ray diffraction (XRD), the powders were modified on glassy carbon electrode (GCE) for detectionof heavy metal ions. The electrochemical analysis was carried out by cyclic voltammetry (CV) andelectrochemical impedance spectroscopy (EIS). Heavy metal ions were detected by square waveanodic stripping voltammetry (SWASV) and differential pulse voltammetry (DPV). The sensitivities ofcadmium(II), copper(II), lead(II) and mercury(II) were analyzed by DPV as 220.20μA·μM -1 ,58.31μA·μM -1 , 243.31μA·μM -1 and 243.39μA·μM -1 , respectively. The detection limits of Cd (II), Cu(II), Pb (II) and Hg (II) were tested using SWASV method. Corresponding results were shown as0.0156μM, 0.03518μM, 0.0448μM and 0.0336μM, respectively. Stability experiment furtherconfirmed that silver with nano-branched structure was an alternative material for the detection ofheavy metal ions.