Cerium oxide nanoparticles: Size-selective formation and structure analysis

Zhang, Feng; Chan, Siu-Wai; Spanier, Jonathan E.; Apak, Ebru; Jin, Qiang; Robinson, Richard D.; Herman, Irving P.
January 2002
Applied Physics Letters;1/7/2002, Vol. 80 Issue 1, p127
Academic Journal
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.


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