Cyclic voltammetry procedures were undertaken using a portable CH Instrument 1220C bipotentiostat (CH Instruments, Inc Austin, Tx). A three-electrode configuration was used for electrochemical deposition of Ag nanodendrites with Pt microband arrays as working electrodes, gold on-chip counter electrode and platinum on-chip pseudo reference electrode. Electrochemical impedance spectroscopy (EIS) measurements were carried out using Autolab Bipotentiostat/Galvanostat (Metrohm, Netherlands) undertaken using a three-electrode silicon sensor chip with Pt microelectrode arrays as working electrodes, gold on-chip counter electrode and platinum on-chip pseudo reference electrode. (Frequency range: 0.01 Hz-10 kHz; amplitude: 5 mV).