Fabrication of phenazopyridine sensor based on electrodeposition of Pt nanoparticles on H–CaFe–Cl-layered double hydroxide film modified glassy carbon electrode

Abstract

A sensitive phenazopyridine sensor has been developed by electrodeposition of Pt nanoparticles on H–CaFe–Cl-layered double hydroxide modified glassy carbon. Electrochemical impedance spectroscopy and cyclic voltammetry were used to investigate the formation of H–CaFe–Cl-layered double hydroxide film and Pt nanoparticles on the electrode surface. The properties of modified electrode were characterized by field emission scanning electron microscopy and energy dispersive X-ray spectroscopy. The fabricated sensor exhibits outstanding electrocatalytic activities toward the oxidation of phenazopyridine. The oxidation peak current was proportional to the concentration of phenazopyridine from 5×10−8 to 6.9×10−4molL−1 including two linear segments with a detection limit of 6.3×10−9molL−1 at signal to noise ratio of 3. The proposed method was examined as a selective, simple and precise method for voltammetric determination of phenazopyridine in real samples with satisfactory results.