Synthesis, structure and optical properties of CoAl2O4 spinel nanocrystals

被引：164

作者：

Duan, Xiulan ^{[1
]}

Pan, Mei ^{[2
]}

Yu, Fapeng ^{[1
]}

Yuan, Duorong ^{[1
]}

机构：

[1] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

[2] Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Guangdong, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 03期

基金：

中国国家自然科学基金;

关键词：

CoAl2O4; spinel; Sol-gel method; X-ray photoelectron spectroscopy; Optical properties; SOL-GEL; X-RAY; COBALT; CATALYSTS; NANOPARTICLES; PERFORMANCE; ELECTRON; PIGMENT; ESCA;

D O I：

10.1016/j.jallcom.2010.09.199

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：

CoAl2O4 nanocrystals were synthesized by sol-gel method using citric acid as a chelating agent at low temperature. The as-synthesized samples were characterized by thermal analysis, X-ray powder diffraction, infrared spectroscopy and transmission electron microscopy. The results show that CoAl2O4 spinel is the only crystalline phase with a size of 10-30 nm in the temperature range 500-1000 degrees C. The temperature dependence of the distribution of Al3+ and Co2+ ions in the octahedral and tetrahedral sites in nanocrystals was investigated by X-ray photoelectron spectroscopy (XPS). It is observed that the inversion parameter decreases with increasing annealing temperature. Analysis of the absorption properties indicates that Co2+ ions are located in the tetrahedral sites as well as in the octahedral sites in the CoAl2O4 nanocrystals. The origin of the green color (300-500 nm absorption band) should be due to the octahedrally coordinated Co2+ ions. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1079 / 1083

页数：5

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