Fabrication and electrochemical characterization of RGO-Y2O3: Eu3+/Li+ nanocomposite modified glassy carbon electrode for enhanced dopamine detection

Abstract

The hydrothermal approach was used to produce the RGO-Y₂O₃:Eu³⁺/Li⁺ nanocomposites (NCs). XRD, SEM and TEM were used to characterize the synthesized NCs structure and morphology. The synthesized Y₂O₃:Eu³⁺/Li⁺ nanoparticles (NPs) depicted uniform spherical shape structures distributed on the RGO surface. XRD analysis confirmed the presence of cubic phase in all synthesized NCs, confirming their excellent crystallinity. The NCs were employed to make modified glassy carbon electrodes (MGCE) for dopamine (DA) electrochemical detection at pH 7. The redesigned electrodes offer adequate current responsiveness for DA voltammetry. Different variables such as scan rate, pH, and DA concentration were examined. The linear range for dopamine used in this study was 2–10 mM and detection limit was found to be 1.4846 mM only when DA was present and 1.0145 mM in presence of uric acid respectively. Cyclic voltammetry was used to measure DA in the presence of Uric Acid (UA), and differential pulse voltammetry was used to measure DA selectivity. The modified electrode recovered 91.67 % and was stable. As a result, the manufactured electrode appears to be promising for DA detection.