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

Silver nanoparticles dispersed in polypyrrole (ppy) matrixes coated on glassycarbon electrode (gce), as a novel electrode, was easily synthesized by electropolymerizationof pyrrole on gce and then electrodeposited silver nanoparticles on ppyelectrode. the electrochemical behavior and electro-catalytic activity of silvernanoparticles/ppy/gce were characterized by cyclic voltammetry. the morphology ofelectrodes was characterized by scanning electron microscopy. the electrochemical sensorexhibited strong electro-catalytic activity with toward reduction of nitrate. the detection limitof nitrate was found to be 2.0 ?m. moreover, the sensor showed excellent sensitivity,selectivity, and stability.