Article
Chemistry, Physical
Elie A. Daher, Bassam Riachi, Jean Chamoun, Christel Laberty-Robert, Wael Hamd
Summary: A new template-free, porous, and wrinkled ZnO thin films were created to enhance the photocatalytic degradation of organic pollutants in water. The formation of such nanostructure was driven by intrinsic stress and was tracked using in situ thermo-ellipsometry technique. The engineered nanostructure exhibited a wrinkled structure with a porosity of 22-25% and an average pore size of 24 nm, promoting the adsorption of pollutants. The ZnO films showed high photocatalytic activity with a removal efficiency above 92% and degradation rate constants of 0.0049 min-1 and 0.0121 min-1 under UVA and visible light, respectively.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Ceramics
Koji Abe, Tasuku Kubota
Summary: Al-doped ZnO (AZO) films were prepared by sol-gel method using precursor solutions containing oxygen sources. Zinc vacancy acceptors were formed under oxygen-rich growth conditions. Glass substrates with a zinc layer were used to supply zinc to the AZO films during calcination annealing. The AZO films showed wurtzite ZnO crystal structure and high transparency. The electrical properties of the films were improved by using substrates with a zinc layer, achieving a low resistivity of 9.4 x 10(-4) Ocm.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xia-Li Liang, Jian-Qing Dai, Guo-dong Zhang
Summary: High-quality modified BiFe1-2xMgxMnxO3 (BFMMO-x, x=0-5 mol%) films were prepared via the sol-gel method, and the influence of (Mg, Mn) doping on the properties of BFMMO films was investigated. The results showed that doping (Mg, Mn) effectively improved the structural stability, dielectric properties, and optical characteristics of BFMMO films.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
M. Narasimha Murthy, V. Ganesh, G. Ravinder, S. Anusha, G. Chandrakala, C. J. Sreelatha
Summary: Aluminum and rubidium-doped zinc oxide thin films were deposited on glass substrates using sol-gel dip coating method. The effect of dopant content on structural, surface morphological, vibrational, and optical properties was studied using X-ray diffraction, SEM-AFM, and Raman spectrometer. It was observed that introducing Rb impurities into the ZnO lattice resulted in a deterioration in crystal quality and a blue shift in the bandgap. The increase in dopant concentration led to a change from hydrophilic to hydrophobic nature and showed significant antibacterial activity against E. coli.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Khedidja Chehhat, Abla Mecif, Abedel Hakim Mahdjoub, Roshan Nazir, Manzoor Ahmad Pandit, Faiza Salhi, Abdelouahab Noua
Summary: In this study, high-quality ZnO thin films with different loadings of cobalt (Co) were prepared on porous ceramics substrates using a sol-gel dip-coating scheme. The impact of cobalt on the crystal phase, surface morphology, optical and chemical properties of the films was investigated. The results showed that the addition of cobalt led to a decrease in grain size and a reduction in band gap values of the films, resulting in improved performance in the removal of Orange II dye under UV radiation.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
V Deepthi, Anju Sebastian, B. Vidhya
Summary: Sol-gel spin coating method was used to prepare ZnO and ZnO:GO composite films, and the effect of GO incorporation on film morphology and photocatalytic activity was investigated. The results showed that GO was evenly dispersed on the film surface, and the incorporation of GO improved the effectiveness of dye removal.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Hamed Beigli, Mahdi Shaddoust, Mohammad Hadi Ahmadi, Abbas Bagheri Khatibani
Summary: In this study, undoped zinc oxide and cobalt-doped thin films were prepared using a sol-gel dip-coating technique, and the effects of gamma irradiation on the structural, morphological, and optical properties of the samples were investigated. The results showed significant changes in various physical properties, especially in optical and sensing characteristics, under low and relatively long-term gamma irradiation.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
N. H. Erdogan, T. Kutlu, N. Sedefoglu, H. Kavak
Summary: Undoped ZnO films and Na-doped ZnO films with different Na/Zn molar ratios were deposited on glass substrates by the sol-gel spin coating method. Sodium doping significantly influenced the structure and properties of the films, resulting in different electrical conductivity and optical characteristics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Arpita Das, Alakananda Das, Chirantan Singha, Anirban Bhattacharyya
Summary: The effects of annealing temperature on Al and Mg co-doped ZnO thin films were investigated. It was found that a three-order magnitude reduction in electrical resistivity was achieved for an increase of 100 degrees C annealing temperature, and a 5x increase in magnitude of the photocurrent was observed. The mechanism behind these effects was attributed to the temperature-induced variation in Mg to Al ratio in the films.
Article
Chemistry, Physical
Umberto Belle, Daniela Spini, Barbara Del Curto, MariaPia Pedeferri, Maria Vittoria Diamanti
Summary: The environmental impact of industrial technologies and related remediation methods is a significant research area. In the development of materials for wastewater treatment or air purification, the use of hazardous reactants often diminishes the overall positive contribution to the environment. This study presents the synthesis of stable titanium dioxide (TiO2) sols using an environmentally friendly method. The sol was deposited on glass and evaluated for wastewater purification ability by photocatalytic degradation of organic dyes. The results showed high efficiency and reusability, with degradation rates exceeding 85% for Rhodamine B and 100% for Methylene Blue.
Article
Materials Science, Multidisciplinary
B. Al Farsi, T. M. Souier, F. Al Marzouqi, M. Al Maashani, M. Bououdina, H. M. Widatallah, M. Al Abri
Summary: Transparent pure and Al-doped zinc oxide thin films were successfully deposited on glass substrates using the sol-gel dip-coating technique. The study found that Al doping and annealing temperature have significant effects on the structural, morphological, optical properties, and photocatalytic activity of the films. Al doping was found to improve the photocatalytic activity of the films.
Article
Physics, Multidisciplinary
Ahmed Ziti, Bouchaib Hartiti, Salma Smairi, Hicham Labrim, Youssef Nouri, Amine Belafhaili, Herve Joel Tchognia Nkuissi, Salah Fadili, Mounia Tahri, Philippe Thevenin
Summary: In this research, copper-cobalt-tin-sulphur (CCoTS) absorbers were synthesized using the sol-gel process and dip-coating deposition technique. The impact of annealing temperature on the structural, compositional, morphological, optical and electrical characteristics of CCoTS layers was studied. The results showed that the CCoTS absorbers had a polycrystalline structure with small grain size and high purity. The density and uniformity of the films improved with increasing annealing temperature. The band gap and sheet resistance of the films also exhibited interesting changes.
Article
Materials Science, Multidisciplinary
D. Vinoth Pandi, V Saraswathi, N. Muthukumarasamy, S. Agilan, P. Balraju, Dhayalan Velauthapillai
Summary: In this study, seed layers for the growth of ZnO nanorods thin films were prepared using sol-gel dip coating and spin coating methods, with different effects on the structural and optical properties observed. ZnO nanorods were found to grow with uniform size and high orientation on the spin coated seed layer, as shown in FESEM images. TEM studies revealed detailed characteristics of the ZnO nanorods, including average length, diameter, and crystal structure, while XRD patterns confirmed hexagonal structure. UV absorption and optical band gap of the ZnO nanorods were determined through absorption spectra, with PL spectra indicating UV and visible emission.
Article
Chemistry, Physical
Mohamed Belghiti, Lekbira El Mersly, El Mountassir El Mouchtari, Salah Rafqah, Khalid Ouzaouit, Hakim Faqir, Intissar Benzakour, Amane Oueriagli, Abdelkader Outzourhit
Summary: The objective of this study was to investigate the effect of ZnO powder partially coated with a nanometric layer of Y2O3 on the treatment of water contaminated with organic pollutants. The results showed that the partial coating with Y2O3 enhances the photocatalytic activity of ZnO, with almost complete degradation of the sulfamethazine antibiotic under different pH conditions.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Optics
Wuttichai Sinornate, Hidenori Mimura, Wisanu Pecharapa
Summary: This investigation focuses on the structural, optical and electrical properties of Sb-doped/undoped ZnO double layer structure annealed in a nitrogen atmosphere. The study reveals that the crystal structure is deteriorated due to Sb incorporation in the ZnO lattice and nitrogen annealing, and the diffraction intensity decreases with different thicknesses of the ZnO film. The presence of Sb atom in the doped ZnO film is confirmed by depth profile measurement. The transmittance spectra show high transparency with interference fringe, and the photoluminescence spectrum exhibits near-band-edge emission of ZnO without any emission in the visible region. The electrical properties demonstrate diode characteristics and photocurrent under dark and UV irradiation, respectively.