Fabrication of highly ordered nanoporous thin Au films and their application for electrochemical determination of epinephrine
By Wierzbicka, Ewa; Sulka, Grzegorz D.
Published in Sensors and Actuators B: Chemical
2016
Abstract
Abstract The anodic oxidation of epinephrine (EP) on Au electrodes with a large surface area was studied in phosphate buffer solution (pH 7). The nanoporous thin Au films deposited over the surface of a highly ordered anodic aluminum oxide (AAO) served as sensitive electrodes for a simple and fast electrochemical determination of epinephrine. The electrochemical characterization of the obtained electrodes was carried out by cyclic voltammetry (CV) and chronoamperometry. The results revealed that oxidation processes of {EP} are controlled by diffusion. The transfer coefficient (? = 0.52), total number of electrons involved in the first step of {EP} oxidation (n = 1), and the diffusion coefficient of {EP} in the 0.1 M phosphate buffer solution (D = 3.4156