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<p>An innovative multifunctional sensor was developed using Mixed Metal Oxide (MMO) nanostructures, which include zinc oxide (ZnO), ferric oxide (Fe<sub>2</sub>O<sub>3</sub>), copper oxide (CuO), and nickel oxide (NiO) in different concentrations, employing low-temperature wet chemical synthesis methods. The analysis of structural and surface morphology confirms the existence of distinct peak planes and validates the formation of the corresponding metal oxide nanoparticles. The experimental CV profile analysis revealed that the (ZnO:NiO) sensor displayed remarkable sensing characteristics, achieving a peak current response of 77.12 µA for urea and 77.44 µA for melamine, with both substances showing a response time of merely 2&#xa0;s. Additionally, this sensor demonstrated enhanced sensitivity of 13.77% for urea and 14.41% for melamine, along with a low detection limit (LOD) of 1.019&#xa0;mmol, in comparison to other developed MMO-based multifunctional sensors. Furthermore, the assessment of gas-sensing performance (CO-5&#xa0;ppm) demonstrated a notable enhancement in sensitivity for the ZnO:NiO sensor, achieving an increase of 4.3%, with a response time of 2&#xa0;s and a recovery time of 1&#xa0;s, respectively.</p>

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Experimental performance evaluation of tailored mixed metal oxide-based nanostructures for dual sensing applications

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • V. Shyamala,
  • S. Radha,
  • R. Kiruthika,
  • K. R. Acchutharaman

摘要

An innovative multifunctional sensor was developed using Mixed Metal Oxide (MMO) nanostructures, which include zinc oxide (ZnO), ferric oxide (Fe2O3), copper oxide (CuO), and nickel oxide (NiO) in different concentrations, employing low-temperature wet chemical synthesis methods. The analysis of structural and surface morphology confirms the existence of distinct peak planes and validates the formation of the corresponding metal oxide nanoparticles. The experimental CV profile analysis revealed that the (ZnO:NiO) sensor displayed remarkable sensing characteristics, achieving a peak current response of 77.12 µA for urea and 77.44 µA for melamine, with both substances showing a response time of merely 2 s. Additionally, this sensor demonstrated enhanced sensitivity of 13.77% for urea and 14.41% for melamine, along with a low detection limit (LOD) of 1.019 mmol, in comparison to other developed MMO-based multifunctional sensors. Furthermore, the assessment of gas-sensing performance (CO-5 ppm) demonstrated a notable enhancement in sensitivity for the ZnO:NiO sensor, achieving an increase of 4.3%, with a response time of 2 s and a recovery time of 1 s, respectively.