Electroanalytical performance of hierarchical nanostructures of MgCo₂O₄ on reduced graphene oxide modified screen-printed electrode for the sensitive determination of Sudan I

ABSTRACT

The present work reports the synthesis of MgCo₂O₄-rGO nanohybrid by a simple method. The nanohybrid was characterised by XRD, Raman spectroscopy, EDX, SEM, and TEM. An effective electrochemical sensing platform to detect Sudan I based on MgCo₂O₄-rGO nanohybrid modified screen-printed electrode (MgCo₂O₄-rGO/SPE) is reported. Electrocatalytic sensing of Sudan I is carried out using cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CHA) as well as differential pulse voltammetry (DPV) measurements. Interestingly, this newly developed sensor showed greater peak currents with the decreased anodic potential than that of the bare SPE. The modified electrode demonstrated distinctive electrocatalytic activities to detect Sudan I with the longer linear response range between 0.04 and 580.0 µM, low limit of detection (LOD) of 9.0 nM, and high sensitivity of 0.0838 µA µM⁻¹. In addition, MgCo₂O₄-rGO/SPE sensor exhibited excellent electrochemical stability, repeatability and reproducibility for Sudan I detection. Analytical utility of our method revealed acceptable detection outputs for Sudan I. Therefore, it could be concluded that this sensor (MgCo₂O₄-rGO/SPE) exhibited very good electrochemical behaviour for electrochemical detection of Sudan I oxidation.

KEYWORDS:

• MgCo₂O₄-rGO nanohybrid
• screen-printed electrode
• electrochemical sensing
• Sudan I

Acknowledgments

The authors acknowledge the financial support provided for this project (No. 7.S.99.2627) by the Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.

Disclosure statement

No potential conflict of interest was reported by the author(s).