Fabrication of highly ordered nanoporous thin Au films and their application for electrochemical determination of epinephrine
By Ewa Wierzbicka and Grzegorz D. Sulka
Published in Sensors and Actuators B: Chemical
NULL
2016
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
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