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<p>This study focuses on developing a NiO-based Fe<sub>2</sub>O<sub>3</sub>:SiO<sub>2</sub>-rGO sensing nanocomposite using hydrothermal and spin-coating techniques. The structural and gas sensing properties of nanocomposite were thoroughly investigated using advanced characterization methods, such as FTIR, XRD, UV-Vis spectroscopy, Raman spectroscopy, and FESEM with EDX. The XRD results confirmed the successful synthesis of the targeted nanocomposites with well-defined phases and structures. FESEM analysis revealed a uniform film surface featuring spherical particles with increased surface roughness making Fe<sub>2</sub>O<sub>3</sub>:SiO<sub>2</sub>-rGO-NiO nanocomposite, a key factor for enhancing gas sensing performance. Raman spectroscopy indicated a reduced intensity ratio for Fe<sub>2</sub>O<sub>3</sub>:SiO<sub>2</sub>-rGO-NiO compared to other compositions, while optical studies demonstrated excellent transparency in the visible wavelength range. Hydrogen gas sensing tests showed that the Fe<sub>2</sub>O<sub>3</sub>:SiO<sub>2</sub>-rGO-NiO nanocomposite delivered exceptional performance. At room temperature, it exhibited a rapid response time of 24&#xa0;s and a recovery time of 36&#xa0;s for a 1000&#xa0;ppm hydrogen concentration. At an elevated temperature of 300&#xa0;°C, it achieved remarkable sensitivity with response and recovery times of 5 and 14&#xa0;s, respectively. These results highlight its suitability for hydrogen detection under both ambient and high-temperature conditions. The findings suggest that Fe<sub>2</sub>O<sub>3</sub>:SiO<sub>2</sub>-rGO-NiO thin films have significant potential as cost-effective and efficient hydrogen gas sensors for diverse applications. </p>

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Facile synthesis of a NiO-based Fe2O3:SiO2-rGO nanocomposite thin film and its application as a highly sensitive hydrogen sensor

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • R. Triveni,
  • Y. Srilatha,
  • Prakash Ravindra Somani,
  • P. Aruna,
  • Vijaya Kumar Kambila

摘要

This study focuses on developing a NiO-based Fe2O3:SiO2-rGO sensing nanocomposite using hydrothermal and spin-coating techniques. The structural and gas sensing properties of nanocomposite were thoroughly investigated using advanced characterization methods, such as FTIR, XRD, UV-Vis spectroscopy, Raman spectroscopy, and FESEM with EDX. The XRD results confirmed the successful synthesis of the targeted nanocomposites with well-defined phases and structures. FESEM analysis revealed a uniform film surface featuring spherical particles with increased surface roughness making Fe2O3:SiO2-rGO-NiO nanocomposite, a key factor for enhancing gas sensing performance. Raman spectroscopy indicated a reduced intensity ratio for Fe2O3:SiO2-rGO-NiO compared to other compositions, while optical studies demonstrated excellent transparency in the visible wavelength range. Hydrogen gas sensing tests showed that the Fe2O3:SiO2-rGO-NiO nanocomposite delivered exceptional performance. At room temperature, it exhibited a rapid response time of 24 s and a recovery time of 36 s for a 1000 ppm hydrogen concentration. At an elevated temperature of 300 °C, it achieved remarkable sensitivity with response and recovery times of 5 and 14 s, respectively. These results highlight its suitability for hydrogen detection under both ambient and high-temperature conditions. The findings suggest that Fe2O3:SiO2-rGO-NiO thin films have significant potential as cost-effective and efficient hydrogen gas sensors for diverse applications.