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<p>Over the past few decades, the issue of toxic and reactive gases has been of concern for environmental safety and human health, which in turn has led to ongoing developments in gas detection technology. Spinel ferrites are well known as suitable candidates for gas sensing. This study examines Zn<sub><i>x</i></sub>Cu<sub>0.2-<i>x</i></sub>Mn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0.0 to 0.2) nanoparticles, including their synthesis by sol-gel processing, characterization, and gas-sensing properties, as a sensor for nitrogen dioxide (NO<sub>2</sub>). The formation of a cubic spinel structure was confirmed by X-ray diffraction analysis, with the crystallite size decreasing from 73 nm to 67 nm with increasing zinc content. Field emission scanning electron microscopy revealed a decrease in particle size with increasing Zn content, which contributed to increased surface area and porosity. The presence of distinct absorption bands in the Fourier transform infrared spectra at 597–613 cm<sup>−1</sup> and 389–401 cm<sup>−1</sup> was attributed to metal-oxygen vibrations in the spinel configuration. The gas response of Zn<sub><i>x</i></sub>Cu<sub>0.2-<i>x</i></sub>Mn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub> nanoparticles exhibited improved sensitivity due to increased surface area as the crystallite size decreased, and the sensors exhibited a strong response towards NO<sub>2</sub> in gas sensing tests. The best performance was observed with Zn<sub>0.2</sub>Mn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub>, exhibiting higher sensitivity and shorter response time. These results suggest that Zn<sub><i>x</i></sub>Cu<sub>0.2-<i>x</i></sub>Mn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub> ferrites are viable candidates for high-performance NO<sub>2</sub> gas sensors, with implications for understanding gas-sensing behavior associated with tuning composition and structural properties.</p><p></p>

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Zn-substituted CuMn ferrite nanoparticles for enhanced NO2 gas sensing: synthesis, characterization, and high-performance

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Huda J. Abdulhussein,
  • Ali M. Mohammad

摘要

Over the past few decades, the issue of toxic and reactive gases has been of concern for environmental safety and human health, which in turn has led to ongoing developments in gas detection technology. Spinel ferrites are well known as suitable candidates for gas sensing. This study examines ZnxCu0.2-xMn0.8Fe2O4 (x = 0.0 to 0.2) nanoparticles, including their synthesis by sol-gel processing, characterization, and gas-sensing properties, as a sensor for nitrogen dioxide (NO2). The formation of a cubic spinel structure was confirmed by X-ray diffraction analysis, with the crystallite size decreasing from 73 nm to 67 nm with increasing zinc content. Field emission scanning electron microscopy revealed a decrease in particle size with increasing Zn content, which contributed to increased surface area and porosity. The presence of distinct absorption bands in the Fourier transform infrared spectra at 597–613 cm−1 and 389–401 cm−1 was attributed to metal-oxygen vibrations in the spinel configuration. The gas response of ZnxCu0.2-xMn0.8Fe2O4 nanoparticles exhibited improved sensitivity due to increased surface area as the crystallite size decreased, and the sensors exhibited a strong response towards NO2 in gas sensing tests. The best performance was observed with Zn0.2Mn0.8Fe2O4, exhibiting higher sensitivity and shorter response time. These results suggest that ZnxCu0.2-xMn0.8Fe2O4 ferrites are viable candidates for high-performance NO2 gas sensors, with implications for understanding gas-sensing behavior associated with tuning composition and structural properties.