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

Silver dendrites were fabricated on platinum mesh by electro-deposition in pure AgNO 3 solution. The dendritic silver powders with nano-branches were obtained after the platinum mesh treated by ultrasonic process. After characterized by Field-emitting Scanning Electron Microscopy (FE-SEM) and X-ray diffraction (XRD), the powders were modified on glassy carbon electrode (GCE) for detection of heavy metal ions. The electrochemical analysis was carried out by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Heavy metal ions were detected by square wave anodic stripping voltammetry (SWASV) and differential pulse voltammetry (DPV). The sensitivities of cadmium(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 as 0.0156μM, 0.03518μM, 0.0448μM and 0.0336μM, respectively. Stability experiment further confirmed that silver with nano-branched structure was an alternative material for the detection of heavy metal ions.