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<p>In this study, mixed oxide gas sensors based on p-type CuO-SnO<sub>2</sub>: F thin films were prepared via the spray pyrolysis technique. The effect of dopant nature on the structural, optical, morphological, and ozone gas sensing properties was investigated. The results show that graphene-doped CuO-SnO<sub>2</sub>: F thin films have the best crystallinity and lowest band gap value (2.5&#xa0;eV). The gas response of the homemade devices based on different dopant elements of CuO-SnO<sub>2</sub>: F nanocomposites toward O<sub>3</sub> as a function of temperature, concentration, and different visible&#xa0;light&#xa0;sources was measured and compared with undoped CuO-SnO<sub>2</sub>: F films. Experiments indicated that Gr-doped CuO-SnO<sub>2</sub>: F-based sensor can detect minuscule traces of O<sub>3</sub> gas with impressive sensitivity, even at room temperature, and show a fast response (53&#xa0;s) and recovery time (225&#xa0;s) at low O<sub>3</sub> concentration (30&#xa0;ppb) compared to undoped and other X-doped CuO-SnO<sub>2</sub>: F sensors (X = Al, Gr, and Fe). This enhancement can be justified by the increase of both porosity and crystallinity of the fabricated devices after doping with graphene that facilitate the charge transfer in the material. Furthermore, the Gr-doped CuO-SnO<sub>2</sub>: F showed excellent selectivity to ozone (four times higher) compared to other oxidizing and reducing gases (NO<sub>2</sub>, ethanol, and toluene). This study proves that the incorporation of graphene into the metal oxide semiconductor (MOSC) matrix can enhance the sensing capabilities of the material and improve its performance.</p>

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A novel approach of dopant nature impact on the physical properties of CuO-SnO2: F thin films for enhancing ozone sensing parameters at low temperature

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Ghofrane Charrada,
  • Sandrine Bernardini,
  • Mejda Ajili,
  • Neila Jebbari,
  • Khalifa Aguir,
  • Najoua Turki Kamoun

摘要

In this study, mixed oxide gas sensors based on p-type CuO-SnO2: F thin films were prepared via the spray pyrolysis technique. The effect of dopant nature on the structural, optical, morphological, and ozone gas sensing properties was investigated. The results show that graphene-doped CuO-SnO2: F thin films have the best crystallinity and lowest band gap value (2.5 eV). The gas response of the homemade devices based on different dopant elements of CuO-SnO2: F nanocomposites toward O3 as a function of temperature, concentration, and different visible light sources was measured and compared with undoped CuO-SnO2: F films. Experiments indicated that Gr-doped CuO-SnO2: F-based sensor can detect minuscule traces of O3 gas with impressive sensitivity, even at room temperature, and show a fast response (53 s) and recovery time (225 s) at low O3 concentration (30 ppb) compared to undoped and other X-doped CuO-SnO2: F sensors (X = Al, Gr, and Fe). This enhancement can be justified by the increase of both porosity and crystallinity of the fabricated devices after doping with graphene that facilitate the charge transfer in the material. Furthermore, the Gr-doped CuO-SnO2: F showed excellent selectivity to ozone (four times higher) compared to other oxidizing and reducing gases (NO2, ethanol, and toluene). This study proves that the incorporation of graphene into the metal oxide semiconductor (MOSC) matrix can enhance the sensing capabilities of the material and improve its performance.