Publications Scientifiques
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Item Exceptional photocatalytic performance of hexagonal ZnO nanorods for anionic and cationic dyes degradation(Elsevier B.V., 2025) Chabira, Fares; Toubane, Mahdia; Tala-Ighil, Razika; Humayun, Muhammad; Ouyang, Chun; Alanazi, Amal Faleh; Bououdina, Mohamed; Kyzas, George Z.This study presents an in-depth investigation of zinc oxide hexagonal nanorods (ZnO NRs) synthesized via a hydrothermal approach at three pH basic values conducted in high-pressure laboratory reactor provided by Parr Instrument Company. The research evaluates the catalytic properties of the ZnO NRs, highlighting their potential for environmental applications. The as-fabricated samples are characterized by various techniques including the X-ray diffraction (XRD), UV–visible spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) analysis, Field emission-scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDAX) and high-resolution transmission electron microscopy (HR-TEM). Rietveld refinement of X-ray diffraction data reveals the formation of high-purity hexagonal Wurtzite-type ZnO phase. Further, it is investigated that by decreasing the pH values, the grain size of ZnO NRs increases from 25.70 nm to 29.91 nm. SEM analyses further confirmed the hexagonal nanorod-shaped morphology of ZnO. The photocatalytic degradation performance of the as-fabricated ZnO NRs for Methylene Blue (MB) and Methyl Orange (MO) dyes increased with the increase in pH value, reaching almost 95 % and 64 %, respectively, after 30 min of UV irradiation. The optimum degradation is achieved at a pH value of 11.Item Study of Temperature and Concentration Effects for CZTS Layers using Spray Pyrolysis(IEEE, 2017) Haouanoh, Djedjiga; TalaIghil, Razika Zaïr; Toubane, Mahdia; Bensouici, Fayçal; Zair, RazikaIn this study, Cu 2 ZnSnS 4 (CZTS) layers were successfully deposited onto glass and silicon substrates by spray pyrolysis technique. The surface morphology, chemical, crystal phase structure and optical properties of (CZTS) thin films were characterized using a scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffractometer (XRD) and UV-visible spectrophotometer. Substrate temperatures and concentrations of precursor effects parameters were investigated. X-ray diffraction showed the formation of kesterite phase. SEM images revealed uniform, smooth, porous, and compact and densely packed morphology. A wide variation in the value of the band gap is observed when we have changed both parameters temperature and concentration.Item 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, MohamedThe 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 cycleItem Materials Research Express Paper Effects of thermal treatment and layers' number on SnO2 thin films properties prepared by sol-gel technique(Iop science, 2019) Haouanoh, D.; Tala-Ighil, Razika; Toubane, MahdiaTin oxide layers are very important in photovoltaic applications. This paper presents an in-depth study of the SnO2 thin films deposited by the gel dip coating technique on glass substrates. The heat treatment and the number of layers effect on structural, morphological, optical and electrical properties were studied. Differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) showed that SnO2 crystallized at 402.5 °C. The diffraction spectra x-rays revealed that a formation of tetragonal cassiterite structure with a preferred growth orientation according to (101) plane. Exceptional film prepared at 200 °C preheated temperature is according to the (110) plane growth orientation. The size of the crystallites is strongly influenced by the preheated temperature, annealing temperature and a number of layers. The AFM images show homogeneous surfaces for all samples except the film prepared at a preheated temperature of 200 °C. However, it becomes smoother by increasing the number of layers. UV-Visible spectroscopy has shown that greater transparency is found in the infrared and visible domains (75%–96%). For all films, the optical band gap energy varies randomly with the preheated temperature; conversely, it increases from 3.83 eV to 3.88 eV for three-layer and six-layer films respectively. The energy gap decreases for samples with more than 6 layers. The minimum resistivity values are 8.1 10–1 Ω cm determined by the four probe method for the sample preheated to 400 °C without annealing temperatureItem Dye Sensitized TiO2 and ZnO Charge Transport Layers for Efficient Planar Perovskite Solar Cells: Experimental and DFT Insights(Springer link, 2019) Chouk, Rihab; Haouanoh, Djedjiga; Aguir, Chadlia; Bergaoui, Manel; Toubane, Mahdia; Al Bensouici, Fayc; Tala-Ighil, RazikaIn this work, the efficiency improvement of planar perovskite solar cells by the introduction of modified electron transport layers (ETLs) is investigated. To this aim, a cobalt complex dye as sensitizer for TiO2, based on Schiff base ligand (Co-NG), and a ZnO layer were prepared by the sol gel method and are tested. The electrodes and the complex are characterized by x-ray diffraction, TGA/DSC and UV–Vis spectroscopy. The photo-physical properties of Co-NG complex investigated at the molecular level show that the dye exhibits good optical behavior with two maxima around 415 nm and 604 nm and a high molar extinction coefficient equal to 27.5 × 103 M−1 cm−1. The influence of sensitization on the optical properties of the ETLs is tested and strong interactions between the dye and the ETLs are found. As a result, the solar cell performances of TiO2/Co-NG and ZnO/Co-NG exhibit a significant efficiency increase equal to 18.94% and 16.32%, respectively, compared to the reference solar cellsItem 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, MahdiaCadmium 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.Item 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, MahdiaItem 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.Item 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.Item Structural, optical, properties of czts layers deposited by spray pyrolysis technique(2015) Tala-Ighil, Razika; Haouanoh, Djedjiga; Toubane, Mahdia; Bensouici, Fayçal; Samantilleke, Anura Priyajith; Slimani, Amel