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Improvement of ozone sensing parameters by CuO–SnO2: F mixed oxide sprayed thin films

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Abstract

In this current work, CuO–SnO2: F mixed oxide thin films were synthesized by spray pyrolysis technique on glass substrates. The structural and optical properties were optimized and improved by varying the substrate temperature from 300 to 350 °C by a step of 25 °C. By increasing the substrate temperature, in addition to the CuO monoclinic phase we notice the appearance of the SnO2: F tetragonal phase in the XRD spectrum. Therefore, CuO–SnO2: F coupled oxide thin film, where the ratio in the spray solution (\(r=\frac{[Cu]}{[Sn]}=3)\) was successfully grown at the elevated temperature equals to 350 °C. This result was confirmed by Raman and FTIR analyses. SEM analysis of CuO–SnO2: F films elaborated at a substrate temperature equal to 350 °C endorsed the particle-like spherical shape structure with smooth surface. While EDS and Elemental mapping confirmed the presence of the expected elements. By using the transmission reflection spectra, we estimated the values of the refractive index n, the extinction coefficient k and the dielectric constant. In the visible area the refractive index (n) varies from 1.5 to 2.3 and the extinction coefficient k decreases from 0.8 for Ts = 300 °C, up to about 0.2 for Ts = 350 °C. Moreover, the photoluminescence spectra of the films was investigated and interpreted. The gas-sensing measurements revealed that CuO–SnO2: F thin films grown by spray-pyrolysis method at the substrate temperature equals to 350 °C, can detect minuscule traces of O3 gas (30 ppb) with good sensitivity, fast response and recovery times (60 s and 79 s respectively), at relatively low temperature (200 °C). This manuscript reports the effectiveness of our homemade device as promoter ozone gas sensor in many industrial applications.

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Data and materials related to this research are available from the relevant author, Ghofrane Charrada within reasonable range.

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  1. Département de Physique, LR99ES13 Laboratoire de Physique de La Matière Condensée (LPMC), Faculté Des Sciences de Tunis, Université de Tunis El Manar, 2092, Tunis, Tunisia

    Ghofrane Charrada, Mejda Ajili, Neila Jebbari & Najoua Turki Kamoun

  2. Aix Marseille Univ, CNRS, IM2NP, Marseille, France

    Ghofrane Charrada, Sandrine Bernardini & Khalifa Aguir

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All authors have participated to the development of this work. GC, MA, NJ, SB, KA and NK effected contribution to the experimental study, search information and results discussion. The first copy of the manuscript was written by GC and all authors contributed to the correction of this manuscript. All authors approved the final version of this article.

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Charrada, G., Ajili, M., Jebbari, N. et al. Improvement of ozone sensing parameters by CuO–SnO2: F mixed oxide sprayed thin films. J Mater Sci: Mater Electron 35, 1120 (2024). https://doi.org/10.1007/s10854-024-12873-1

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