SIZE-DEPENDENT PROPERTIES OF CEO2-Y NANOPARTICLES STUDIED BY RAMAN SCATTERING

@inproceedings{Spanier2001SIZEDEPENDENTPO,
  title={SIZE-DEPENDENT PROPERTIES OF CEO2-Y NANOPARTICLES STUDIED BY RAMAN SCATTERING},
  author={Jonathan E. Spanier and Richard D. Robinson and Fu Zheng},
  year={2001}
}
The combined effects of strain and phonon confinement are seen to explain why the Raman peak near 464 cm - 1 in CeO 2 - y nanoparticles shifts to progressively lower energies and the lineshape of this feature gets progressively broader and asymmetric (on the low-energy side) as the particle size gets smaller. The increasing lattice constant measured for decreasing particle size explains this Raman shift well. The linewidth change is fairly well explained by the inhomogenous strain broadening… 

Figures and Tables from this paper

Size effect of Raman scattering on CeO2 nanocrystal by hydrothermal method

In this study, we prepared surface-modified CeO2 nanocrystals (NCs) by a hydrothermal method, and calcined CeO2 NCs at various temperatures between 400 and 1000 °C for 3 h in air to obtain

Raman spectroscopy characterization of titania nanoparticles produced by flame pyrolysis: The influence of size and stoichiometry

A systematic study of the shift and linewidth of the Eg Raman peak at 144cm−1 of anatase TiO2 nanopowders, produced by a flame aerosol technique, is here presented. The analysis was performed as a

Effects of the agglomeration state on the Raman properties of Co3O4 nanoparticles

The features of the Raman spectra of Co3O4 30-nm nanoparticles depend strongly on their agglomeration state. When measured at low incident laser power, the spectrum of isolated nanoparticles

Raman scattering study of the anharmonic effects in CeO2−y nanocrystals

We have studied the temperature dependence of the F2g Raman mode phonon frequency and broadening in CeO2−y nanocrystals. The phonon softening and phonon linewidth are calculated using a model which

Phonon–phonon interactions in Ce0.85Gd0.15O2−δ nanocrystals studied by Raman spectroscopy

Phonon–phonon interactions and phase stability of Gd-doped ceria nanocrystals were examined over the temperature range 293–1100 K by Raman spectroscopy. The phonon confinement model (PCM) based on

Anomalous Raman Scattering of Colloidal Yb3+,Er3+ Codoped NaYF4 Nanophosphors and Dynamic Probing of the Upconversion Luminescence

Size‐dependent Raman spectra of the hexagonal (β)‐phase Yb3+,Er3+ codoped NaYF4 nanophosphors and dynamic probing of the upconversion luminescence (UCL) are reported. Raman scattering results show

Effects of Confinement, Strain and Nonstoichiometry on Raman Spectra of Anatase TiO2 Nanopowders

Nanosized titanium dioxide (TiO2) powders in anatase phase were prepared by laserinduced pyrolysis. Specific surface area of as-grown powders measured by BET method was between 77 and 110 m2/g. The
...