A combined experimental and theoretical analysis of Fe-implanted TiO(2) modified by metal plasma ion implantation

文化大學機構典藏 CCUR > 理工學院 > 工學院 > 化學工程與材料工程學系暨碩士班 > 期刊論文 > Item 987654321/20921

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Title:	A combined experimental and theoretical analysis of Fe-implanted TiO(2) modified by metal plasma ion implantation
Authors:	Yen, CC (Yen, Chung-Chih) Wang, DY (Wang, Da-Yung) Shih, MH (Shih, Ming-Huei) Chang, LS (Chang, Li-Shin) Shih, HC (Shih, Han C.)
Contributors:	化材所
Keywords:	Titanium dioxide Metal plasma ion implantation Densities of states Band gap
Date:	2010-09
Issue Date:	2011-12-09 11:38:14 (UTC+8)
Abstract:	Photocatalyst titanium dioxide (TiO(2)) thin films were prepared using sol-gel process. To improve the photosensitivity of TiO(2) at visible light, transition metal of Fe was implanted into TiO(2) matrix at 20 keV using the metal plasma ion implantation process. The primary phase of the Fe-implanted TiO(2) films is anatase, but X-ray diffraction revealed a slight shift of diffraction peaks toward higher angles due to the substitutional doping of iron. The additional band gap energy levels were created due to the formation of the impurity levels (Fe-O) verified by X-ray photoelectron spectroscopy, which resulted in a shift of the absorption edge toward a longer wavelength in the absorption spectra. The optical band gap energy of TiO(2) films was reduced from 3.22 to 2.87 eV with an increase of Fe ion dosages from 0 to 1 x 10(16) ions/cm(2). The band gap was determined by the Tauc plots. The photocatalysis efficiency of Fe-implanted TiO(2) was assessed using the degradation of methylene blue under ultraviolet and visible light irradiation. The calculated density of states for substitutional Fe-implanted TiO(2) was investigated using the first-principle calculations based on the density functional theory. A combined experimental and theoretical Fe-implanted TiO(2) film was formed, consistent with the experimentally observed photocatalysis efficiency of Fe-implanted TiO(2) in the visible region. (C) 2010 Elsevier B. V. All rights reserved.
Appears in Collections:	[化學工程與材料工程學系暨碩士班] 期刊論文

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