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    • Physical investigations and photocatalytic activity test of NiMoO$_4$ thin films prepared by spray pyrolysis technique

      A ARFAOUI A MHAMDI

      Volume 45 Published: 22 July 2022 Article ID 0140

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/045/0140

    • Keywords

       

      NiMoO$_4$ thin films; spray pyrolysis; structural study; spectroscopic ellipsometry; electrical properties; photocatalytic activity.

    • Abstract

       

      Semiconductor photocatalysts, especially nickel molybdenum oxide with a monoclinic structure, have been frequently used to address environmental pollution issues. Many advantages have been discovered for photocatalytic applications using this material, so, in this study, we have studied the physical properties of NiMoO$_4$ thin film prepared using the spray approach. The structural properties have been characterized by X-ray diffraction analysis, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy. The structural analysis shows a monoclinic structure with space group C$_2$/m and a grain size equal to 150 nm. In addition, the optical measurements show direct optical transitions with a bandgap equal to 3.56 eV, revealed by an ellipsometric spectroscopy study. Using a spectroscopy impedance analysis, we have also investigated the frequency relaxation phenomenon and determined the activation energy, which was equal to 1.16 eV. Finally, the photocatalytic degradation of methylene blue was performed on this thin layer under sunlight irradiation. The monoclinic structure and possible defects in the lattices were used to discuss the effective photocatalytic activity.

    • Author Affiliations

       

      A ARFAOUI1 2 A MHAMDI2 3

      1. Physics Department, College of Science, Jouf University, P. O. Box 2014, Sakaka, Saudi Arabia
      2. Laboratoire de Nanomatériaux, Nanotechnologie et Energie (L2NE), Faculté des Sciences de Tunis, Université de Tunis El Manar, P. O. Box: 2092, Tunis, Tunisia
      3. Physics Department, Faculty of Sciences and Humanities Afif, Shaqra University, P. O. Box: 33, Shaqra 11961, Saudi Arabia

    • Dates

       
      Published
      22 July 2022
      Manuscript received
      29 January 2022
      Accepted
      31 March 2022
      Final version published online
      22 July 2022

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