A Study On Synthesis And Properties Of TiO₂/α-Fe₂O₃ Nanoarray Composite Material

Energy has been concerning by public people for decades. The gradual depletion of fossil fuel resources and the impact of environmental damage can promote the search for new energy. More than 99% of the Earth total solar energy, with an inexhaustible, there is no pollution, so it becomes an important new energy development hotspot. TiO₂ heterojunction semiconductor because of its low cost and simple technology and stable performance of traditional silicon solar cells, has become a powerful competitor.The paper through hydrothermal method using conductive glass thickness on the growth of a certain array of nano-titanium dioxide film, then set it as the substrate, chemical bath deposition method to deposit iron oxide nanoparticles prepared TiO₂/α-Fe₂O₃ array composite film. XRD showed that: the prepared samples is complex of rutile phase TiO₂ andα-Fe₂O₃ hematite, and found no other iron oxides or the appearance of FexTiOy; scanning electron microscope showed that: Fe₂O₃ surface of small particles in a layer of TiO₂ tight coating, and uniform coating Fe₂O₃ continuous and uniform; UV-visible absorption spectra show that: sedimentary iron 2h, its best performance of UV-visible absorption, adjust the content ofα-Fe₂O₃ was found with the Fe content increased, the absorption edge has a very obvious red shift, and, when the annealing temperature rising when the long-wave absorption edge towards the direction of the overall mobile, 600℃annealed 2h, its best performance of UV-visible absorption, and thus calculate the band gap width; IV characteristics through the photocatalytic properties of the test and testing techniques to study the content ofα-Fe₂O₃ different light absorption characteristics and the impact of the formation and thin film heterojunction photovoltaic conversion properties. The results show that: TiO₂/α-Fe₂O₃ complex in the precursor concentration of 0.1M iron nitrate, the maximum photocurrent for 1.34 mA/cm², but again,α-Fe₂O₃ content increases, but decreases the photocurrent, This is because the excess iron oxide electron transfer center will become a central electronic complex, while the hole short life, prone to light corrosion, impact of light on the separation of electrons and holes, thereby reducing the optical activity. TiO₂/α-Fe₂O₃ array composite film photoelectric conversion efficiency of 0.133% increase than that of pure TiO₂ array of 3 times, because the good favor of the formation of heterojunction light of current density increased significantly; the azo dye RY15 and rhodamine B as dye photocatalytic experiments showed that the core - shell TiO₂/α-Fe₂O₃ array of composite materials in the ultraviolet, visible light photocatalytic activity has good in 4 hours UV irradiation, TiO₂/α-Fe₂O₃ array composite materials on the azo dye RY15, the degradation rate of 56%; 3 hours under visible light irradiation, TiO₂/α-Fe₂O₃ array of composite materials on the degradation rate of rhodamine B to 78%.Consequently, TiO₂/α-Fe₂O₃ because of its well heterostructure semiconductor thin film formation current density is conducive to the improvement of light, making TiO₂/α-Fe₂O₃will be in solar cells, photocatalytic hydrogen evolution and other fields and its important applications; At the same time, TiO₂/α-Fe₂O₃ degradation of organic pollutants of different nature from the catalytic performance, making TiO₂/α-Fe₂O₃ a wide range of improved photocatalytic activity, and can be recycled, reuse, to address the nano-TiO₂ powder easy to drain the body, it is difficult dilemma recycled many times.