Electrolytic deposition of PN and its metal oxide composites was carried out using chronoamperometry in a three-electrode setup. Suitable potentials for polymerization and incorporation of the Zn and Fe oxide nanoparticles were determined by linear and cyclic voltammetry. Using a gold working electrode at 0.8 V vs. SCE for 600 s, a thin PN film was deposited slowly at the electrode. Then a negative potential was then applied to achieve ion exchange with the Zn and Fe oxide nanoparticles . For example, a potential of 0.6 V was applied vs. SCE to deposit ZnO nanoparticles over 600 s to yield the PN@ZnO composite (PNZ).