期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 131, 期 3, 页码 666-671出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.10.032
关键词
Oxygen vacancy; Lattice expansion; Strain; Red shift; Visible luminescence
Ceria nanoparticles were synthesized by hydrolysis of cerium nitrate in basic medium. The cubic fluorite structure of ceria was confirmed by XRD. From TEM studies ceria nanoparticles were found to be spherical in shape with an average diameter of 5 nm. The prepared nanoparticles have a predominant orientation along (2 2 2) crystallographic plane. Oxygen vacancies and Ce3+ lead to the lattice expansion and strain in CeO2. Peak asymmetry and broadening of Raman active mode peak further confirms the presence of these defects. Total concentration of oxygen vacancies that are present in the ceria nanocrystallites is calculated to be 1.234 x 10(20) cm(-3). These oxygen vacancies and ceria related defects result in an effective red shifting of the band gap by changing its structural regularity. The visible luminescence peaks are also caused by these Ce3+ and oxygen vacancy centers. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据