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<p>Here, a facile and convenient electrochemical sensor for caffeine (CF) determination based on graphene oxide decorated with β-cyclodextrin metal-organic framework and Ag-MnO<sub>2</sub> nanocomposite (Ag-MnO<sub>2</sub>/GO/CD-MOF/GCE) has been devised. The environmentally friendly synthesized materials were analyzed using FTIR, XRD, EDX, and SEM techniques. The fabricated sensor showed high electro-catalytic activity towards the oxidation of CF in 0.1&#xa0;M acetate buffer solution (ABS, pH 4.0). The effect of scan rate suggested that the electrode process for CF oxidation is a typical diffusion-controlled. In addition, a linear relationship was obtained between the peak current and concentration of CF in the range from 0.05 to 500 µM with the correlation coefficient (R<sup>2</sup>), and limit of detection (LOD; 3σ) of 0.9995, and 14.3 nM, respectively. The proposed sensor can be applied for detection of CF in commercial real samples even in existence of common interferences with high reproducibility and stability.</p>

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A High Performance Sensor Based on Graphene Oxide Decorated with β-Cyclodextrin Metal-Organic Framework and Biosynthesized Ag-MnO2 Nanocomposite for Voltammetric Determination of Caffeine

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Mortaga M. Abou-Krisha,
  • Abdulrahman G. Alhamzani,
  • Ehab A. Abdelrahman,
  • Mohamed N. Goda,
  • Mohamed E. Eissa,
  • Mohamed Abd-Elsabour

摘要

Here, a facile and convenient electrochemical sensor for caffeine (CF) determination based on graphene oxide decorated with β-cyclodextrin metal-organic framework and Ag-MnO2 nanocomposite (Ag-MnO2/GO/CD-MOF/GCE) has been devised. The environmentally friendly synthesized materials were analyzed using FTIR, XRD, EDX, and SEM techniques. The fabricated sensor showed high electro-catalytic activity towards the oxidation of CF in 0.1 M acetate buffer solution (ABS, pH 4.0). The effect of scan rate suggested that the electrode process for CF oxidation is a typical diffusion-controlled. In addition, a linear relationship was obtained between the peak current and concentration of CF in the range from 0.05 to 500 µM with the correlation coefficient (R2), and limit of detection (LOD; 3σ) of 0.9995, and 14.3 nM, respectively. The proposed sensor can be applied for detection of CF in commercial real samples even in existence of common interferences with high reproducibility and stability.