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<p>The hybrid ZnO-CuO nanoparticles were synthesized using the hydrothermal method. Structural characteristics were assessed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and transmission electron microscopy (TEM) techniques. The nanoparticles were integrated into a carbon paste electrode to explore its potential for voltammetric detection of dopamine. The modified carbon paste electrode (MCPE) was used for electrochemical response to evaluate dopamine in a pH 7.2 PBS solution, with a scan rate of 50 mVs<sup>−1</sup>. The electrode modification facilitated the individual determination of dopamine through cyclic voltammetry analysis. Analysis of the voltammograms from the oxidation studies indicated that the hybrid ZnO-CuO nanoparticles demonstrate superior catalytic activity in dopamine oxidation. Additionally, the photocatalytic capabilities of the hybrid ZnO-CuO nanoparticles were assessed in degrading both cationic and anionic dyes. For crystal violet, which is a cationic dye, 1&#xa0;mg/L of the concentration of ZnO-CuO showed a maximum of 82.93% degradation, and complete degradation of Cry.V dye was observed in less than 30&#xa0;min at pH 12.0. Furthermore, the nanoparticles showed higher efficacy against gram-positive bacteria than gram-negative bacteria, as determined by disc diffusion tests against <i>Staphylococcus aureus</i> and <i>Escherichia coli.</i></p>

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Hybrid ZnO-CuO nanoparticles: for MCPE in dopamine detection, dye degradation, and antibacterial assessment

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • S. R. Kiran Kumar,
  • Mohan Reddy R,
  • Harisha S,
  • K. Yogesh Kumar,
  • B. K. Jayanna,
  • Shobha G

摘要

The hybrid ZnO-CuO nanoparticles were synthesized using the hydrothermal method. Structural characteristics were assessed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and transmission electron microscopy (TEM) techniques. The nanoparticles were integrated into a carbon paste electrode to explore its potential for voltammetric detection of dopamine. The modified carbon paste electrode (MCPE) was used for electrochemical response to evaluate dopamine in a pH 7.2 PBS solution, with a scan rate of 50 mVs−1. The electrode modification facilitated the individual determination of dopamine through cyclic voltammetry analysis. Analysis of the voltammograms from the oxidation studies indicated that the hybrid ZnO-CuO nanoparticles demonstrate superior catalytic activity in dopamine oxidation. Additionally, the photocatalytic capabilities of the hybrid ZnO-CuO nanoparticles were assessed in degrading both cationic and anionic dyes. For crystal violet, which is a cationic dye, 1 mg/L of the concentration of ZnO-CuO showed a maximum of 82.93% degradation, and complete degradation of Cry.V dye was observed in less than 30 min at pH 12.0. Furthermore, the nanoparticles showed higher efficacy against gram-positive bacteria than gram-negative bacteria, as determined by disc diffusion tests against Staphylococcus aureus and Escherichia coli.