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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Ali, M. A. |
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| Azevedo, Nuno Monteiro |
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Landolsi, Zoubaida
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article
Enhanced electrical and photocatalytic properties of porous TiO2 thin films decorated with Fe2O3 nanoparticles
Abstract
<p>In this work, we developed a facile synthetic process for the fabrication of porous heterojunction Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> using a two-step method to be employed as a visible light photocatalyst. In the first step, porous TiO<sub>2</sub> thin films were successfully prepared by a sol–gel method using polyethylene glycol (PEG). The porous TiO<sub>2</sub> thin film was further annealed and then decorated with nanoparticles of Fe<sub>2</sub>O<sub>3</sub> using the direct electrodeposition method. The photocatalysts were structurally investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) and Raman spectroscopy. The Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> heterojunction presented both an anatase TiO<sub>2</sub> phase and rhombohedric structure of hematite α-Fe<sub>2</sub>O<sub>3.</sub> The optical properties have been investigated for all the materials, in which the TiO<sub>2</sub> material present in porous heterojunction exhibited a remarkable absorption and red shift in the visible region from 3.2 to 3.0 eV compared to the pure heterojunction Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>. Moreover, the electrochemical behavior of the samples was investigated. Photocatalytic activity was assessed from methylene blue degradation with remarkable degradability performance under visible light. The photodegradation of the porous heterojunction Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> exhibited an enhanced photodegradation up to 70% after 150 min of irradiation.</p>