Papers by Keyword: Iron Doping

Abstract: Thin films of pure and iron doped MnS, have been deposited on glass substrates using a straightforward and cost-effective technique named Chemical Bath Deposition (CBD). The temperature of the heating water bath was maintained at 90°C for three hours of deposition. Deposition is done by varying the doping concentration of Fe from 0 to 10%. Manganese chloride, iron chloride tetrahydrate, urea, and thioacetamide were the precursors employed in this work. The X-ray diffraction method was used to ascertain the thin film's structural properties. Using the Scherrer formula, the average crystallite size for an undoped MnS thin film was observed to be 30.28 nm and is decreased to 24.02 nm for 4% of Fe doping. For an undoped MnS thin film, the values of dislocation density and material strain were 1.09× 10⁻³(𝑛𝑚)⁻² and 3.418× 10⁻³, respectively. These values were increased to 1.73× 10⁻³(𝑛𝑚)⁻² and 4.65× 10⁻³, respectively due to decrement in the crystallite size. Grain size and morphology were examined using Scanning Electron Microscopy (SEM). Micrographs of samples were obtained at different magnifications and their values were noted as 0.9 μm for pure and 4.69 μm for 4% Fe doped thin films. Optical properties were determined using DRS method. The energy band gap was found as 2.21 eV for pure samples and it was decreased to 2.14, 2.09, 1.98, 1.96 and 1.93 eV for 2, 4, 6, 8 and 10% iron doping, respectively. Solar cells, solar selective coatings, sensors, optical mass memory, and anti-reflection coatings have all made substantial use of MnS thin films.

Abstract: This paper reported the study of the photocatalytic activity of immobilized Fe³⁺ doped TiO₂ on glass fibre yarn. A dip-coating technique fixing catalyst onto the support surface was applied to get the TiO₂/Fe³⁺ coated filler. A photo reactor consists of a cylindrical quartz tube and filler with the immobilized catalyst was applied in the study. The photocatalytic activity was determined by the degradation of phenol in water (10 mg L^-1). Results suggested that the fibre glass coated TiO₂/Fe³⁺ photocatalysis filler has very excellent performances in repeat using and the supported TiO₂ was very stable in photocatalysis reaction.

Abstract: A series of La₂Sn_2-xFe_xO₇ (x=0, 0.2, 0.6, 1.0, 1.4, 1.8, 2.0) catalysts were prepared by a constant pH co-precipitation method, and their catalytic activity was investigated for simultaneous removal of NOx and soot. The incorporation of Fe strongly influences the crystal phase composition, surface area and redox properties of the catalysts. All the catalysts displayed soot oxidation activity with nearly 100% selectivity towards CO₂. The doped solids exhibit higher activities than the undoped one, which may be related to the enhancement of reducibility derived from structure defects induced by doping. LSF0.6 may be a good catalyst with high soot oxidation activity (T_i = 334 °C) and a high maximum productivity of N₂ (P_N2= 12.4%).

Abstract: The iron-doped amorphous carbon films (a-C: Fe) and Al₂O₃ films were deposited on n-type silicon substrates using pulsed laser deposition to form (a-C: Fe)/Al₂O₃/Si solar cells in a pulsed laser deposition (PLD) system. The microstructure of the films was investigated by Raman scattering spectroscopy. The electrical properties of the films were characterized by room temperature electrical conductivity (σ) and the activation energy (E_a). The results show that the Fe-doped amorphous homogeneous structure is formed by Fe diffused into a-C films after annealing treatment. The a-C: Fe films are disordered graphitized carbon system and are rich in sp². The (a-C: Fe) /Al₂O₃ /Si junction has good rectifying properties and remarkable Photovoltaic effect.