Composite Metal Oxide Modified–Graphene Oxide Electrode for Gallic Acid Determination

Authors : Çağrı Ceylan Koçak

Pages : 817-827

View : 39 | Download : 95

Publication Date : 2025-12-31

Article Type : Research Paper

Abstract :In this study, composite metal oxide modified graphene oxides were prepared on the surface of a glassy carbon electrode. For this aim, a graphene oxide-modified/glassy carbon electrode (GO/GCE) was initially prepared using the drop-dry technique. Subsequently, TeOx-ZnOx nanoparticles were modified onto the GO/GCE surface using an electrochemical method (TeOx-ZnOx/GO/GCE). The prepared modified surface was compared with other electrodes using electrochemical impedance spectroscopy and cyclic voltammetry. The electrochemical behavior of gallic acid was investigated with the TeOx-ZnOx/GO/GCE in a pH 2.3 Britton-Robinson buffer. Under optimized conditions, the sensor exhibited a linear range of 0.5 µmol L⁻¹ -1000 µmol L⁻¹ for gallic acid detection using the amperometry technique, with a limit of detection (LOD) of 0.2 µmol L⁻¹. Real sample analysis was successfully performed with tea samples. In conclusion, the proposed composite modified electrode provides a stable surface for accurate and sensitive analysis of gallic acid determination.
Keywords : Gallik Asit, grafen oksit, tellür oksit, çinko oksit, modifiye elektrot

ORIGINAL ARTICLE URL