Relationship between morphology and structure of shape-controlled CeO2 nanocrystals synthesized by microwave-assisted hydrothermal method

被引：30
作者：
Bezkrovnyi, O. S. [1 ]
Lisiecki, R. [1 ]
Kepinski, L. [1 ]
机构：
[1] Polish Acad Sci, Inst Low Temp & Struct Res, POB 1410, PL-50950 Wroclaw, Poland
来源：
CRYSTAL RESEARCH AND TECHNOLOGY | 2016年 / 51卷 / 10期
关键词：
CeO2; nanocubes; shape control; microwave-assisted hydrothermal synthesis; growth mechanism; oriented attachment; CERIUM OXIDE NANOPARTICLES; PHOTOLUMINESCENCE PROPERTIES; H-2; PRODUCTION; NANORODS; METHANOL; RADIATION; PARTICLES; NANOWIRES; CATALYSTS; CHEMISTRY;
D O I：
10.1002/crat.201600053
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The influence of synthesis conditions on morphology and structure of CeO2 nanocrystals prepared by microwave-assisted hydrothermal method were studied by XRD, TEM, Raman spectroscopy and photoluminescence measurements. Decisive effect of the OH-/Ce3+ molar ratio in the reaction mixture on the size and shape of CeO2 nanocrystals was established and explained. Rise of the concentration of OH- groups at the surface of growing CeO2 nanocrystals promotes shape transformation from irregular (spheroidal) to cube and enables oriented attachment mode of particle growth. I was found that the unit cell parameter and intensity of Ce3+ defect related band in the luminescence and Raman spectra in ceria nanoparticles increase as follows: irregular shape nanocrystals < large cube < small primary cube shape particles. The reason is growing contribution of total subsurface volume under {100} faces, exposed by ceria nanocubes, where enhanced concentration of Ce3+ and oxygen vacancies occur.
引用
收藏
页码：554 / 560
页数：7
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