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<p>In this study, thin films of pure titanium dioxide (TiO<sub>2</sub>) and titanium dioxide dual mixed with zinc oxide (ZnO) and magnesium oxide (MgO) with varying concentrations of (ZnO: MgO)<sub>x</sub> ranging from 0 to 30 wt% undoped and doped gold nanoparticles (AuNPs) were prepared on glass using the chemical spray pyrolysis (CSP) technique. The morphological, structural, and sensing properties of the prepared thin films were examined. Atomic Force Microscopy (AFM) analysis revealed that these films exhibit a consistent structure before and after doping. Initially, the roughness of these films was observed to increase upon the introduction of impurities (ZnO: MgO)<sub>x</sub>. This trend reversed at x = 0.20, where a decrease in roughness occurred. Interestingly, a subsequent decrease in the roughness of all films was noted after doping with AuNPs. Gas sensing measurements were carried out through resistance measurements in the absence of, and exposure to, reducing gas (H<sub>2</sub>S) and oxidizing gas (NO<sub>2</sub>). The results showed that sensitivity increased significantly after addition of dual oxides (ZnO: MgO)<sub>x</sub>. The maximum sensitivity (147%) was obtained at a 2% mixing ratio and an operating temperature of 523&#xa0;K for NO<sub>2</sub> and H<sub>2</sub>S gases. The gas sensitivity retarded by addition of gold NPs.</p>

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Gas sensing characteristics of (TiO2)1−x (ZnO: MgO)x thin films doped and undoped with Au NPs for NO2 and H2S detection prepared by spray pyrolysis

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Hiba H. Issa,
  • Bushra A. Hasan

摘要

In this study, thin films of pure titanium dioxide (TiO2) and titanium dioxide dual mixed with zinc oxide (ZnO) and magnesium oxide (MgO) with varying concentrations of (ZnO: MgO)x ranging from 0 to 30 wt% undoped and doped gold nanoparticles (AuNPs) were prepared on glass using the chemical spray pyrolysis (CSP) technique. The morphological, structural, and sensing properties of the prepared thin films were examined. Atomic Force Microscopy (AFM) analysis revealed that these films exhibit a consistent structure before and after doping. Initially, the roughness of these films was observed to increase upon the introduction of impurities (ZnO: MgO)x. This trend reversed at x = 0.20, where a decrease in roughness occurred. Interestingly, a subsequent decrease in the roughness of all films was noted after doping with AuNPs. Gas sensing measurements were carried out through resistance measurements in the absence of, and exposure to, reducing gas (H2S) and oxidizing gas (NO2). The results showed that sensitivity increased significantly after addition of dual oxides (ZnO: MgO)x. The maximum sensitivity (147%) was obtained at a 2% mixing ratio and an operating temperature of 523 K for NO2 and H2S gases. The gas sensitivity retarded by addition of gold NPs.