Core-shell hyperbranched chitosan nanostructure as a novel electrode modifier
By Sedki, Mohammed; Hefnawy, Amr; Hassan, Rabeay Y. A.; El-Sherbiny, Ibrahim M.
Published in International Journal of Biological Macromolecules
2016
Abstract
Abstract The present study reports, for the first time, the development and use of core-shell amino-terminated chitosan (Cs) hyperbranched nanoparticles (HBCs-NH2 NPs) as a novel natural polymer-based electrode modifier for efficient electrochemical systems. The electrochemical activity of the developed HBCs-NH2 {NPs} as compared to Cs {NPs} was identified by standard oxidation-reduction reactions of ferricyanide. The oxidation-reduction peaks height was about twofold higher than the response of Cs-modified electrode. On the other hand, {NADH} oxidation at the nanostructured surfaces confirmed the electrocatalytic activity where the oxidation of {NADH} appeared at a lower overpotential (from 805 mV to 635 mV vs Ag/AgCl). Eventually, a diffusion-controlled process was confirmed from the scan rate effect.