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<p>This research presents the influence of potassium hydroxide (KOH) concentration in the preparation of Co<sub>3</sub>O<sub>4</sub> nanoparticles to analyze the dopamine sensing and electrochemical characteristics. High concentrations of 1&#xa0;M, 2&#xa0;M, and 3&#xa0;M of KOH were employed in the precursor solution. The XRD studies reveal that the prepared samples are face-centered cubic with spinel formation, and the calculated crystallite size range of 27&#xa0;nm to 35&#xa0;nm. Vibrational sample magnetometer (VSM) profiles confirm that all the samples possess weak ferromagnetism, with an increase in hysteresis area as the concentration of KOH increases. Electrochemical studies of dopamine sensing reveal that the sensing current decreases with the increase of KOH concentration, ranging from 0.95 to 1.96 µA with decreasing trend. Moreover, a mixed behavior is observed for the supercapacitor performance, showing superior charge transfer characteristics with a specific capacitance range from 210 F/g to 240 F/g.</p>

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Influence of KOH on dopamine sensing and electrochemical properties of Co3O4 nanoparticles

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • S. Atchaya,
  • J. Meena Devi,
  • P. Sureshkumar,
  • Anoop Singh,
  • Sandeep Arya,
  • S. Sriram

摘要

This research presents the influence of potassium hydroxide (KOH) concentration in the preparation of Co3O4 nanoparticles to analyze the dopamine sensing and electrochemical characteristics. High concentrations of 1 M, 2 M, and 3 M of KOH were employed in the precursor solution. The XRD studies reveal that the prepared samples are face-centered cubic with spinel formation, and the calculated crystallite size range of 27 nm to 35 nm. Vibrational sample magnetometer (VSM) profiles confirm that all the samples possess weak ferromagnetism, with an increase in hysteresis area as the concentration of KOH increases. Electrochemical studies of dopamine sensing reveal that the sensing current decreases with the increase of KOH concentration, ranging from 0.95 to 1.96 µA with decreasing trend. Moreover, a mixed behavior is observed for the supercapacitor performance, showing superior charge transfer characteristics with a specific capacitance range from 210 F/g to 240 F/g.