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Annealing effect on physical properties of evaporated molybdenum oxide thin films for ethanol sensing

Abstract : This paper deals with some physical investigations on molybdenum oxide thin films growing on glass substrates by the thermal evaporation method. These films have been subjected to an annealing process under vacuum, air and oxygen at various temperatures 673, 723 and 773 K. First, the physical properties of these layers were analyzed by means of X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM) and optical measurements. These techniques have been used to investigate the oxygen index in MoOx properties during the heat treatment. Second, from the reflectance and transmittance optical measurements, it was found that the direct band gap energy value increased from 3.16 to 3.90 eV. Finally, the heat treatments reveal that the oxygen index varies in such molybdenum oxides showing noticeably sensitivity toward ethanol gas.
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https://hal.univ-angers.fr/hal-02564575
Contributeur : Okina Université d'Angers <>
Soumis le : mardi 5 mai 2020 - 22:14:23
Dernière modification le : vendredi 23 octobre 2020 - 18:48:04

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Saad Touihri, A. Arfaoui, Y. Tarchouna, A. Labidi, Mosbah Amlouk, et al.. Annealing effect on physical properties of evaporated molybdenum oxide thin films for ethanol sensing. Applied Surface Science, Elsevier, 2017, 394, pp.414-424. ⟨10.1016/j.apsusc.2016.10.139⟩. ⟨hal-02564575⟩

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