Influence of Fe ions in characteristics and optical properties of mesoporous titanium oxide thin films

被引：75

作者：

Zhang, Yun ^{[1
]}

Shen, Yue ^{[1
]}

Gu, Feng ^{[1
]}

Wu, Mingming ^{[1
]}

Xie, Yian ^{[1
]}

Zhang, Jiancheng ^{[1
]}

机构：

[1] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2009年 / 256卷 / 01期

关键词：

Mesoporous TiO2; Thin films; Fe ions; Nanocrystalline; Optical properties; PHOTOCATALYTIC ACTIVITY; HYDROPHILIC PROPERTIES; TIO2; DIOXIDE; DEGRADATION; CATALYSTS; WATER;

D O I：

10.1016/j.apsusc.2009.07.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Fe-doped mesoporous titanium dioxide (M-TiO2-Fe) thin films have been prepared on indium tin oxide (ITO) glass substrates by sol-gel and spin coating methods. All films exhibited mesoporous structure with the pore size around 5-9 nm characterized by small angle X-ray diffraction (SAXRD) and further confirmed by high resolution transmission electron microscopy (HRTEM). Raman spectra illustrated that lower Fe-doping contributed to the formation of nanocrystalline of M-TiO2-Fe thin films. X-ray photoelectron spectroscopy (XPS) data indicated that the doped Fe ions exist in forms of Fe3+, which can play a role as e or h(+) traps and reduce e /h(+) pair recombination rate. Optical properties including refractive indices/n, energy gaps/E-g and Urbach energy width/E-0 of the thin films were estimated and investigated by UV/vis transmittance spectra. The presence of Fe content extended the light absorption band and decreased the values of n, implying enhanced light response and performance on dye-sensitized solar cells (DSSC). The optimum Fe content in M-TiO2-Fe thin films is determined as 10 mol%, for its compatibility of well crystalline and well potential electron transfer performance. Crown Copyright (C) 2009 Published by Elsevier B. V. All rights reserved.

引用

页码：85 / 89

页数：5

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