Structural and optical properties of Ti1-xCoxO2 films prepared by sol-gel spin coating

被引：16

作者：

Huang, CM

Guo, YP

Liu, XQ

Wang, YY ^{[1
]}

机构：

[1] Lanzhou Univ, Dept Phys, Lanzhou 730000, Peoples R China

[2] Nanjing Univ, State Key Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

THIN SOLID FILMS | 2006年 / 505卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

optical properties; sol-gel; diluted magnetic semiconductors; titanium oxide;

D O I：

10.1016/j.tsf.2005.10.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ti1-xCoxO2 (x=0-0.07) films were prepared by sol-gel spin coating and characterized by a variety of techniques. We mainly investigated the effect of Co dopant on the structural and optical properties of Ti1-xCoxO2 films. XRD studies showed that the magnetic Co impurity atoms were substituted for the Ti sites in rutile TiO2. Also, the FTIR spectra clearly showed the substitution of Co atom for Ti in TiO2, resulting in a disorder of the crystal structure and the presence of oxygen vacancies in Ti1-xCoxO2 lattice. By vibrating sample magnetometer (VSM) measurement, the films with x=0.03, 0.05 and 0.07 were found to be ferromagnetic at room temperature. For the case of ferromagnetic Ti1-xCoxO2 films, an emission band in the range of 450-500 nm from oxygen vacancies at various energies was detected from the photoluminescence (PL) measurement. VSM and PL analyses showed that oxygen vacancies probably played a major role in ferromagnetism of the Ti1-xCoxO2 system with Co substituting for Ti. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：141 / 144

页数：4

共 15 条

[1] Preparation and characterization of TiO2 thin films by sol-gel method [J].