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Gold Electrode Modified with Vanadium Dioxide and Graphene Oxide for Non-Enzymatic Electrochemical Detection of Glucose

Author

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  • E. T. S. Neves
  • R. G. Cunha Filho
  • E. M. Guerra
  • D. T. Cestarolli

Abstract

This work presents the development of a non-enzymatic glucose sensor based on a gold electrode modified with a composite of vanadium dioxide (VO2) and graphene oxide (GO). The VO2 was synthesized via a facile hydrothermal method and combined with GO to form a thin film on the Au electrode surface. The electrochemical behavior of the Au/VO2-GO electrode was thoroughly investigated. The modified electrode exhibited a pH sensitivity of 58.0 ± 0.02 mV/pH, closely approximating the theoretical Nernstian response. The electrocatalytic activity towards glucose oxidation was assessed using cyclic voltammetry and square-wave voltammetry in synthetic urine. The anodic peak current increased linearly with glucose concentration in the range of 4.0 to 5.4 mmol.L⁻¹. The sensor demonstrated a detection limit of 0.65 mmol L⁻¹ and a quantification limit of 2.15 mmol.L⁻¹. The electrochemical process was identified as diffusion-controlled. Despite a relatively low electroactive surface area (roughness factor = 1.3 × 10-3), the Au/VO2-GO electrode showed promising sensitivity and stability for non-enzymatic glucose detection, suggesting potential for application in clinical analysis.

Suggested Citation

  • E. T. S. Neves & R. G. Cunha Filho & E. M. Guerra & D. T. Cestarolli, 2026. "Gold Electrode Modified with Vanadium Dioxide and Graphene Oxide for Non-Enzymatic Electrochemical Detection of Glucose," International Journal of Scientific Research in Science and Technology, Technoscience Academy, vol. 13(2), pages 876-887, April.
    • Handle: RePEc:etm:ijsrst:v13:y2026:i2:id:1536
    DOI: 10.32628/IJSRST2613114
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