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<p>Zinc oxide/tin oxide (ZnO/SnO<sub>2</sub>) nanocomposites were synthesized at various ratios using pulsed laser deposition for gas sensing applications. The structural characteristics and surface morphology and electrical properties were analyzed at different ratios. This helps to determine how compositional variations affect particle size, distribution, and their subsequent influence on gas sensitivity. XRD analysis revealed the polycrystalline structures of ZnO/SnO<sub>2</sub> nanocomposite thin films, exhibiting two distinct phases: the hexagonal wurtzite structure of ZnO and the tetragonal structure of SnO<sub>2</sub>. Field emission scanning electron microscopy (FE-SEM) analysis of the surface morphology showed a dispersion of semi-spherical nanoparticles interconnected to form cauliflower-like structures, with an average particle size of 6.5&#xa0;nm for a 70ZnO/30SnO<sub>2</sub> ratio. The 70/30 composite exhibited the highest carrier concentration (4.563 × 10¹² cm⁻³) as determined by Hall effect measurements. All nanocomposite samples were n-type. The gas sensitivity of ZnO/SnO<sub>2</sub> nanocomposites at varying ratio toward NO<sub>2</sub> and H<sub>2</sub>S gases revealed that the optimal sample was synthesized at a 70/30 ratio, demonstrating greater sensitivity to the reducing gas than the oxidizing gas.</p>

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Enhance the efficiency of ZnO/SnO2 nanocomposite gas sensor using pulsed laser deposition

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Amna A. Al-Bayati,
  • H. F. Al-Taay

摘要

Zinc oxide/tin oxide (ZnO/SnO2) nanocomposites were synthesized at various ratios using pulsed laser deposition for gas sensing applications. The structural characteristics and surface morphology and electrical properties were analyzed at different ratios. This helps to determine how compositional variations affect particle size, distribution, and their subsequent influence on gas sensitivity. XRD analysis revealed the polycrystalline structures of ZnO/SnO2 nanocomposite thin films, exhibiting two distinct phases: the hexagonal wurtzite structure of ZnO and the tetragonal structure of SnO2. Field emission scanning electron microscopy (FE-SEM) analysis of the surface morphology showed a dispersion of semi-spherical nanoparticles interconnected to form cauliflower-like structures, with an average particle size of 6.5 nm for a 70ZnO/30SnO2 ratio. The 70/30 composite exhibited the highest carrier concentration (4.563 × 10¹² cm⁻³) as determined by Hall effect measurements. All nanocomposite samples were n-type. The gas sensitivity of ZnO/SnO2 nanocomposites at varying ratio toward NO2 and H2S gases revealed that the optimal sample was synthesized at a 70/30 ratio, demonstrating greater sensitivity to the reducing gas than the oxidizing gas.