Cerium oxide nanoparticles: Size-selective formation and structure analysis

被引:649
作者
Zhang, F
Chan, SW [1 ]
Spanier, JE
Apak, E
Jin, Q
Robinson, RD
Herman, IP
机构
[1] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA
[2] Columbia Univ, Mat Res Sci & Engn Ctr, New York, NY 10027 USA
关键词
D O I
10.1063/1.1430502
中图分类号
O59 [应用物理学];
学科分类号
摘要
Nanoparticles of cerium oxide with a narrow size distribution (+/- 15%) are prepared by mixing cerium nitrate solution with an ammonium reagent. High-resolution transmission electron microscopy (TEM) indicates that over 99% of the synthesized particles are single crystals. TEM and photon absorption are used to monitor particle size. The lattice parameter increases up to 0.45% as the particle size decreases to 6 nm, as observed with x-ray diffraction. Raman spectra also suggest the particle-size effect and concomitant lattice expansion. The lattice expansion can be explained by increased concentrations of point defects with decreasing particle size. (C) 2002 American Institute of Physics.
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页码:127 / 129
页数:3
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