Highly Sensitive Voltammetric Sensor for Determination of Ascorbic Acid Using Graphite Screen Printed Electrode Modified with ZnO/Al₂O₃ Nanocomposite

摘要

A sensitive and selective voltammetric sensor based on graphite screen printed electrode modified by ZnO/Al2O3 nanocomposite for the detection of ascorbic acid has been successfully developed. The electrochemical behavior of prepared electrode for the determination of ascorbic acid was systematically investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimum conditions, the modified electrode exhibits linear responses to ascorbic acid in the ranges 1.0–100 μM, with detection limits (S/N = 3) calculated to be 0.6 μM. Finally, the developed sensor was successfully applied to the detection of ascorbic in real samples.