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TiO_2 doped film preparation , structure and properties of

Author: HanYingYing
Tutor: JiangXiaoHong
School: Nanjing University of Technology and Engineering
Course: Materials Processing Engineering
Keywords: Titanium dioxide film Doping Electron beam evaporation Crystal structure Photocatalytic properties
CLC: TB383.2
Type: Master's thesis
Year: 2010
Downloads: 104
Quote: 3
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Abstract


TiO2 chemical stability , non-polluting , low-cost , high photocatalytic activity , is currently the most developed promising catalyst . However, since TiO2 photocatalyst mainly depends on the low utilization of the ultraviolet, visible , thus limiting its application . In order to improve the absorption of the TiO2 in the visible region of the range , it must be modified. This article Fe, Cu, Al - doped TiO2 film were prepared by electron beam evaporation method to study the main process parameters : the doping element type and content of the base material and annealing temperature on the film composition , structure and morphology . With an atomic force microscope ( AFM ) , scanning electron microscopy (SEM), Raman (Raman ) spectroscopy , X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) testing means the surface morphology of the film , crystal structure and composition characterized by UV - visible spectrophotometer (UV-Vis) the test absorbance of TiO2 films doped film visible light absorption range of different elements . The results found that the doping metal ions inhibited the transformation of the polymorphs of TiO2 films and doped TiO2 film is red-shifted absorption band edge , extend the absorption wavelength range . Using electron beam evaporation Preparation of B-doped TiO2 film explores the ordinary glass , quartz glass and ceramic three different base and different annealing temperature on the film composition , structure and morphology . The studies show that the best prepared in B - TiO2 film effect on a quartz substrate , while the doping of B also extends the absorption wavelength range of the film . The prepared doped TiO2 film in a certain proportion , respectively added to the solution of methyl orange , the film prepared by photocatalytic Experimental Study in the degradation rate of the different light sources, methyl orange initial concentration conditions , analysis of process parameters on photocatalysis .

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