Identifying Defects in Ceria-Based Nanocrystals by UV Resonance Raman Spectroscopy

被引：392

作者：

Taniguchi, Takaaki ^{[1
]}

Watanabe, Tomoaki ^{[2
]}

Sugiyama, Naota ^{[1
]}

Subramani, A. K. ^{[1
]}

Wagata, Hajime ^{[1
]}

Matsushita, Nobuhiro ^{[1
]}

Yoshimura, Masahiro ^{[1
]}

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[2] Meiji Univ, Dept Appl Chem, Tama Ku, Kawasaki, Kanagawa 2148571, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 46期

关键词：

RAY PHOTOELECTRON-SPECTROSCOPY; X-RAY; PHASE-TRANSFORMATION; IONIC-CONDUCTIVITY; CEO2; SURFACE; NANOPARTICLES; DIFFRACTION; SCATTERING; SPECTRA;

D O I：

10.1021/jp9049457

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：

Local structures in ceria-based materials were investigated by UV resonance Raman spectroscopy using a 363.8 nm laser line for the first time. In the spectra of a highly crystalline and undoped ceria, overtone LO series are clearly detected due to the multiphonon relaxation by the UV resonance Raman effect. Gd3+ doping in ceria additionally activates the disorder bands that are attributable to lattice spaces with or without an oxygen vacancy. The crystal size dependency of the UV Raman spectra suggests that Ce3+ ions preferably form the MO8-type (M = Ce3+) complex in the undoped ceria nanoparticles and are eliminated by oxidation while heating in air. Gd3+ ions also tend to form a MO8-type complex in the nanocrystalline ceria matrix. However, they diffuse to form the more thermodynamically stable defect clusters that accompany the grain growth upon heating.

引用

页码：19789 / 19793

页数：5

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