Silver Nanoparticles Dispersed in Polypyrrole Matrixes Coated on Glassy Carbon Electrode as a Nitrate Sensor

Silver nanoparticles dispersed in polypyrrole (PPy) matrixes coated on glassy carbon electrode (GCE), as a novel electrode, was easily synthesized by electropolymerization of pyrrole on GCE and then electrodeposited silver nanoparticles on PPy electrode. The electrochemical behavior and electro-catalytic activity of silver nanoparticles/PPy/GCE were characterized by cyclic voltammetry. The morphology of electrodes was characterized by scanning electron microscopy. The electrochemical sensor exhibited strong electro-catalytic activity with toward reduction of nitrate. The detection limit of nitrate was found to be 2.0 ?M. Moreover, the sensor showed excellent sensitivity, selectivity, and stability.