Browsing by Author "Bensouici, F."

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Effect of acid nature in the starting solution on surface and photocatalytic properties of TiO2 thin films
(Elsevier, 2014) Bensouici, F.; Souier, Tewfik; Iratni, A.; Dakhel, A.A.; Tala-Ighil, Razika; Bououdina, M.
Effect of back contact material on CZTS solar cells simulated with AMPS
(2015) Tala-Ighil, Razika; Toubane, Mahdia; Bensouici, F.; Slimani, Amel; Haouanoh, Djedjiga; Iratni, A.; Sali, S.
Effect of Er doping on the microstructural, optical, and photocatalytic activity of TiO2 thin films
(Iop science, 2018) Abdelali, Aouina; Bensouici, F.; Bououdina, M.; Tala-Ighil, Razika
anostructured Er³⁺ doped TiO2 thin films are deposited onto glass substrate via sol-gel dip-coating followed by calcination at 450 °C for 1 h. X-ray diffraction analysis confirms that the films crystallized within single tetragonal anatase phase. Atomic force microscopy observations reveal that the surface of pure TiO2 is characterized by ninepins then becomes smooth and porous for Er-doped TiO2 thin films, while the roughness decreases drastically from 17.2 to 2.6 nm with increasing Er³⁺ percentage. Wettability tests show a super-hydrophilicity character of 0.2 and 0.3%Er doped TiO2 thin films. UV–vis analysis reveals high transmittance above 85% with the presence of interferences indicating the high quality of films. Meanwhile, the energy band gap decreases slightly from 3.31 eV for un-doped to 3.26 eV for 0.4%Er, with a red-shift in the optical absorption edge. High photocatalytic activity using methylene blue indicator has been achieved for 0.2% Er³⁺–TiO2 thin film, reaching 95% for 3 h.
Effect of Er3+ doping on structural, morphological and photocatalytical properties of ZnO thin films
(IOP Publishing, 2018) Bouhouche, S.; Bensouici, F.; Toubane, Mahdia; Azizi, A.; Otmani, A.; Chebout, K.; Kezzoula, F.; Tala-Ighil, Razika; Bououdina, Mahdia
Effect of Thickness on Photocatalytic Activity of TiO2 Thin Films
(Springer link, 2015) Bensouici, F.; Bououdina, Mohamed; Iratni, A.; Tala-Ighil, Razika
Effects of Thickness and Preheated Temperature on Grains Orientation of 2D-ZnO Nanostructure and their Photocatalytic Activity
(Springer, 2021) Toubane, Mahdia; Azizi, Assia; Houanoh, D.; Tala-Ighil, R.; Bensouici, F.; Chebout, K.; lamrani, S.; Bououdina, Mohamed
The effects of pre-heating temperature and thickness of layers on (002) preferred orientation of ZnO thin films and their photocatalytic activity are reported. All films crystallize into a Zincite-type structure. With increasing pre-heating temperature, the evolution from (002) to (101) diffraction peaks indicates change in growth mode of ZnO films. Pre-heating at 100°C is the most favourable for highly oriented ZnO thin ﬁlms along (002) plane whereas all films deposited with different number of layers are oriented along (101) plane. The crystallite size is found to be in the range 20 - 32 nm. The observed average optical transmittance for these films is higher than 90% in the visible range. The energy band gap decreases with increasing number of layers but increases with increasing pre-heating temperatures. Wettability tests of ZnO thin films surface show a hydrophobic aspect for all films. The film pre-heated at 400°C with 223nm of thickness exhibits the highest degradation of methyl blue dye of 94% with high levels of photostability over five cycle
Influence of Deposition Time on the CdS Thin Films Prepared by a Chemical Bath Deposition (CBD)
(2020) Haouanoh, D.; Tala-Ighil, Razika; Bensouici, F.; Toubane, Mahdia
Cadmium sulfide thin layers are frequently used in photovoltaic, especially in the realization of Cu2ZnSnS4 (CZTS) based solar cells as buffer layer. In this work, cadmium sulphide (CdS) thin films have been carried out by using chemical bath deposition (CBD) method. They were deposited onto glass substrates from chemical bath containing cadmium sulfate, thiourea and ammonia at pH = 12. The temperature of the bath was fixed at 60 ºC, and under 150 RPM stirring, the time deposition was varied (10 mn–40 mn). X-ray diffraction revealed the cubic and hexagonal structures formation with secondary phase CdO. AFM images of CdS thin films show that the substrate is covered with granular structures of different size, the root mean square (Rms) value prepared at different time (10 mn, 20 mn, 30 mn and 40 mn) are, 26.05, 25.08, 19.93 and 38.55 nm. High transmission is obtained in the visible and near infra-red.
Nanostructured oxide materials for photodegradation of dyes
(2017) Bensouici, F.; Tala-Ighil, Razika; Bououdina, M.
Optical, structural and photocatalysis properties of Cu-doped TiO2 thin films
(Elsevier, 2017) Bensouici, F.; Bououdina, M.; Dakhel, A.A.; Tala-Ighil, Razika; Tounane, M.; Iratni, A.; Souier, T.; Liu, S.; Cai, W.
Pure and Cu+2 doped TiO2 thin films have been successfully deposited onto glass substrate by sol–gel dip-coating. The films were annealed at 450 °C for 1 h and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM-EDX), atomic force microscopy (AFM), UV–vis spectrophotometer and photocatalytic degradation of methylene blue. XRD confirmed the presence of two phases at higher Cu concentration; TiO2 anatase and CuO. AFM analysis showed that the surface roughness increases within increasing Cu content as well as the presence of large aggregates at higher Cu content. SEM observations confirmed the granular structure of the films, and EDX analysis revealed a low solubility limit (effective doping) of Cu into TiO2 lattice. It was found that the optical band gap energy decreases with increasing Cu content. At constant irradiation time, the photo-degradation of methylene blue rate decreased with increasing concentration of Cu+2
Sol concentration effect on ZnO nanofibers photocatalytic activity synthesized by sol–gel dip coating method
(IOP Publishing, 2017) Toubane, Mahdia; Tala-Ighil, Razika; Bensouici, F.; Bououdina, M.; Souier, M.; Liu, S.; Cai, W.; Iratni, A.
Sol Gel Synthesis and Thermal Treatment Effect on Ce3+ Doped GdBO3 Nanoclusters Obtained in Silica Glass
(2020) Ladjouzi, Samia; Tala-Ighil, Razika; Guerbous, Lakhdar; Bensouici, F.
Silica glass samples containing GdBO3/Ce³⁺ nanoclusters were prepared by sol gel process. The effect of thermal treatment on the structural and optical properties was investigated. From DSC and XRD analysis, it was found that the GdBO3 hexagonal vaterite phase crystallizes inside the silica glass above 700 ℃. The average crystallites size ranges between 20 to 50 nm when the temperature increases from 800 ℃ to 1000 ℃. TEM-EDS analysis evidenced the presence of GdBO3:Ce³⁺ nanoclusters inside the silica matrix. Fourier transform infrared spectroscopy (FTIR) shows the presence of silica and borate linkages with significant changes in the intensity when the temperature increases from 500 ℃ to 1000 ℃. Finally, photoluminescence measurements showed that the sample heat treated at 1000 ℃ presents the maximum photoluminescence intensity assigned to the 5d Open image in new window 4f transition of Ce³⁺ ions
Structural, optical and photocatalytic properties of ZnO nanorods : effect of aging time and number of layers
(Elsevier, 2016) Toubane, Mahdia; Tala-Ighil, Razika; Bensouici, F.
Surface, structural and optical properties dependence of Fe-doped TiO 2 films deposited onto soda–lime–glass
(Elsevier, 2020) Benyakhlef, M.; Bensouici, F.; Bououdina, M.; Dakhel, A.A.; Tala-Ighil, Razika; Toubanea, M.
In this study, pure and Fe doped TiO2 thin films have been prepared via sol-gel method using the tetraethyl-orthotitanate as source of Ti and Fe(III) nitrate as a source of Fe3+ doping. XRD patterns exhibit typical peaks of TiO2 anatase phase. SEM observations confirm the nanometer grain size (below 10 nm) without a defined shape. Optical measurements indicate a transparency in the range 80–100%, it increases with Fe doping level while the energy band gap slightly decreases; 3.36 – 3.28 eV. Wettability test shows a super-hydrophilicity of Fe3+ doped TiO2 thin films and the low contact angle is founded for 0.6%Fe. However, no enhancement in photocatalytic activity of Fe doped TiO2 thin films have been achieved. This may be attributed to sodium diffusion from the substrate. The as-prepared nanostructured Fe-doped TiO2 thin films can be used as potential candidate for self-cleaning due to the super-hydrophilicity character in the visible light
Synergistic effect of Rutile-Anatase Fe-doped TiO2 as efficient nanocatalyst for the degradation of azucryl red
(IOP Publishing, 2019) Kerrami, Ahmed; Mahtout, Laila; Bensouici, F.; Bououdina, M.; Rabhi, S.; Sakher, E.; Belkacemi, H.
The aim of this work is to reduce the impact on the environment of a basic textile dye (azucryl red) using a semiconductor TiO2 and Fe doped TiO2 powders calcined at 600 °C as catalysts. The refinements based on the Rietveld method of x-ray diffraction patterns indicate the formation of Rutile phase for un-doped TiO2, while a phase transformation into Anatase phase occurs upon Fe doping. Scanning electron microscopy analysis reveals the formation of spherical-like particles at the nanoscale that agglomerate into aggregates, meanwhile the chemical composition checked by EDX spectroscopy is close to the stoichiometry. FTIR analysis reveals the presence of OH groups that favor the photocatalytic reaction, while EPR analysis confirms the existence of Fe3+ resulting in the creation of oxygen vacancies. Excellent photocatalytic degradation of azucryl red is obtained by 0.2% Fe doped TiO2, the removal of 100% of dye is achieved within a very short time of 10 min
Synthesis, characterization and photocatalytic behavior of Ag doped TiO2 thin film
(Elsevier, 2015) Bensouici, F.; Souier, T.; Dakhel, A.A.; Iratni, A.; Tala-Ighil, Razika; Bououdina, M.
In this study, structure, microstructure, optical properties and photocatalytic degradation of Rhodamine B (RhB) have been investigated in an aqueous heterogeneous media containing pure and Ag doped TiO2 nanostructures thin films which were prepared by a simple sol–gel route. Thermal analysis demonstrated that Ag content decreased the temperature of anatase-to-rutile phase transformation. X-ray diffraction analysis confirmed that the prepared nanostructures crystallize within anatase-type structure and that the dopant Ag ions were not fully incorporated within TiO2 host lattice, meanwhile both the refractive index and optical band gap were affected by Ag concentration. The photodegradation of Rhodamine B under UV-C radiation by using pure and Ag-doped TiO2 nanostructures showed that Ag played an important role in a significant improvement of the photodegradation efficiency and that the optimum content of Ag ions was found to be 0.5% molar ratio
Tuning the optical properties and photocatalytic activity of Ti0.96 Nd0.02 O2 by Cd/Fe co-doping
(Springer, 2022) Mustafa, A.; Bensouici, F.; Bououdina, M.; Al-Najar, B.; Souier, T.; Belache, B.
This research work aims to investigate Fe/Nd and Cd/Nd co-doped TiO 2 thin films prepared by sol–gel and deposited by dip-coating onto soda-lime glass and the impact of these dopants on the photocatalytic properties. The structural, optical, morphological, and photocatalytic properties of all the prepared sam- ples have been characterized by X-ray diffraction, atomic force microscope, UV– Vis spectroscopy (UV–Vis), and photoluminescence spectroscopy. Rietveld analysis of XRD patterns indicates that TiO 2 co-doping by Fe/Nd and Cd/Nd deteriorates the crystallinity of the pure anatase phase whereas the crystallite size seems not affected, i.e., 13 nm. The morphology of the surface has been affected; the roughness increases from 0.91 nm for pure TiO 2 to 2.73 nm for Cd/ Nd co-doped TiO 2 . UV–vis spectroscopy and photoluminescence analyses indicate that the band-gap energy decreases with co-doping from 3.33 eV for TiO 2 up to 3.26 eV for Fe-Nd/TiO 2 . The degradation of methyl blue tests manifests that pure TiO 2 exhibits higher efficiency of 89% dye in three hours only. Significant decrease in the photocatalytic activity upon co-doping has been observed and a mechanism based on the combined effect of doping, annealing, and substrate effect is proposed to explain the photodegradation behavior
γ-Ray irradiation effect on GdBO3/silica:Ce3+ composite prepared by sol gel method
(Elsevier, 2015) Ladjouzi, S.; Tala-Ighil, Razika; Iratni, A.; Izerrouken, M.; Guerbous, L.; Hadji, S.; Bensouici, F.; Pérez, F.J.
Samples of GdBO3 doped with Ce3+ embedded in amorphous silica matrix were obtained by sol gel process and heat-treat at 1000°C for 2h in argon atmosphere. After elaboration, the samples were irradiated with γ-rays using cobalt (60Co) source in the dose range from 1 to 5kGy. The irradiation effect of γ-rays on structural and optical properties of the synthesized samples were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transforms infrared spectroscopy (FTIR) and photoluminescence spectroscopy. XRD and TEM-EDS results reveal that γ-ray irradiation reduces the crystallite size from 55nm to 30nm. It is found from FTIR study that the absorption bands intensity assigned to structural groups containing BO4 and BO3 units as well as the banding of Si-O-Si bond increases with γ-ray dose up to 4kGy. While photoluminescence measurements show that the emission bands attributed to the 5d→4F transition of Ce+3 ion intensity decreases, it is still significant even after irradiation to a dose of 5kGy. From this results it is concluded that the γ-ray irradiation up to a dose of 5kGy improve the structural and morphological quality of the synthesized GdBO3/silica: Ce3+ without altering significantly its luminescence properties.