Effect of precursor nature on physical properties of chemically sprayed MgO thin films for optoelectronic application
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Effect of precursor nature on physical properties of chemically sprayed MgO thin films for optoelectronic application Maher Tlili1,a , Neila Jebbari2 , Wafa Naffouti3 , Najoua Turki Kamoun1 1 LR99ES13 Laboratoire de Physique de la Matière Condensée (LPMC), Département de Physique, Faculté
des Sciences de Tunis, Université Tunis El Manar, 2092 Tunis, Tunisia
2 Université Tunis El Manar, IPEIEM, 2092 Tunis, Tunisia 3 Institut Supérieur des Sciences Appliquées et technologie de Kairouan, Kairouan, Tunisia
Received: 24 January 2020 / Accepted: 24 August 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Magnesium oxide (MgO) thin layers were successfully synthesized by spray pyrolysis technique on glass substrates. Different precursors were used to prepare the solution such as MgCl2 , Mg(NO3 )2 and Mg(CH3 COO)2 , where water was used as solvent. Structural, optical and morphological properties of MgO thin films were investigated, respectively, by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), spectrophotometry and atomic force microscopy. All diffraction peaks of XRD spectra confirm the face-centered cubic structure of MgO material. The best crystalline quality was obtained for optimum MgO thin films elaborated by using Mg(CH3 COO)2 precursor. The highest crystallite size was obtained for optimum MgO thin film which equals to 37.6 nm. We have confirmed the purity phase of optimum MgO material by fitting the experimental diffractogram using Maud software. Furthermore, FTIR analysis revealed that MgO layers attract CO2 , CO3 2− and mainly H2 O molecules from the atmosphere. High transparent and antireflective characters were obtained from transmission spectra. The average transmission value in the visible range of optimum MgO was equal to 89.27%. From Tauc relation, we have obtained a direct band gap energy (E g) type. E g was decreased from 4.1 to 4.05 eV for MgO grown by using MgCl2 and Mg(CH3 COO)2 , respectively. A high photodegradation rate was about 90% after 120 min under sunlight irradiation. This result indicates that optimum MgO thin film grown at Mg(CH3 COO)2 precursor can be considered as promising and cheaper alternative for removal of organic pollutants in wastewater treatment.
1 Introduction Magnesium oxide (MgO) materials have been attracted a great attention thanks to their wide range of technological applications. MgO compound has a cubic crystalline structure and belongs to the transparent oxide family. It was characterized as an interesting material due to its chemical and thermal stability properties [1], the non-toxicity and abundance of its constitution [2]. Moreover, MgO material possesses direct energy band gap in the range of 3.5–5.67 eV [3, 4] and high transmission values near to 90% [4]. On this basis, MgO thin
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films are attractive candidates for the production of protective layers and barr
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