Copper nanoparticles (Cu-NPs) have been electrochemically synthesized onto a poly(o -phenylenediamine) (PoPD-) coated glassy carbon electrode (GCE). Electrochemical properties and surface characterizations were studied using cyclic voltammetry, atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. Cyclic voltammetry, AFM, SEM, and XRD confirmed the presence of Cu-NPs on the electrode surface. Cu-NPs are firmly stabilized by surface attachment of the PoPD functionality that can be attached to the electrode surface, thus becoming an integral part of the polymer backbone. The Cu-NPs–polymer film-coated GCE (Cu-NPs/PoPD/GCE) showed excellent electrocatalytic activity toward the reduction of hydrogen peroxide (H2O2) and nitrite (NO?2) . Amperometry was carried out to determine the concentration of H2O2 and NO?2 at ?0.3 V. The dependence of the current response on the H2O2 concentration was explored under neutral conditions, and an excellent linear concentration range from 1.0×10?6 to 1.0×10?3M was found. The Cu-NPs/PoPD/GCE allows highly sensitive, low working potential, stable, and fast amperometric sensing of H2O2 and NO?2 . This is promising for the future development of nonenzymatic sensors. The real-sample analysis of commercial H2O2 samples was performed using the proposed method, and the obtained results are satisfactory.
S.Ashok Kumar,Po-Hsun Lo,and Shen-Ming Chen.
J.Electrochem.Soc.,156,7,E118-E123(2009)