Abstract
Raman spectroscopy was used to demonstrate that the lattice dynamics of SrTiO3 (STO) nanoparticles strongly depends on their microstructure, which is in turn determined by the synthetic approach employed. First-order Raman modes are observed at room temperature in STO single-crystalline nanocubes with average edge lengths of 60 and 120 nm, obtained via sol-precipitation coupled with hydrothermal synthesis and a molten salt procedure, respectively. First-order Raman scattering arises from local loss of inversion symmetry caused by surface frozen dipoles, oxygen vacancies, and impurities incorporated into the host lattice. The presence of polar domains is suggested by the pronounced Fano asymmetry of the peak corresponding to the TO2 polar phonon, which does not vanish at room temperature. These noncentrosymmetric domains will likely influence the dielectric response of these nanoparticles.
| Original language | English |
|---|---|
| Pages (from-to) | 5628-5635 |
| Number of pages | 8 |
| Journal | Chemistry of Materials |
| Volume | 20 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - Sep 9 2008 |
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ASJC Scopus subject areas
- Materials Chemistry
- Chemical Engineering(all)
- Chemistry(all)
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Synthesis-dependent first-order Raman scattering in SrTiO3 nanocubes at room temperature. / Rabuffetti, Federico A.; Kim, Hack Sung; Enterkin, James A.; Wang, Yingmin; Lanier, Courtney H.; Marks, Laurence D.; Poeppelmeier, Kenneth R; Stair, Peter C.
In: Chemistry of Materials, Vol. 20, No. 17, 09.09.2008, p. 5628-5635.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis-dependent first-order Raman scattering in SrTiO3 nanocubes at room temperature
AU - Rabuffetti, Federico A.
AU - Kim, Hack Sung
AU - Enterkin, James A.
AU - Wang, Yingmin
AU - Lanier, Courtney H.
AU - Marks, Laurence D.
AU - Poeppelmeier, Kenneth R
AU - Stair, Peter C
PY - 2008/9/9
Y1 - 2008/9/9
N2 - Raman spectroscopy was used to demonstrate that the lattice dynamics of SrTiO3 (STO) nanoparticles strongly depends on their microstructure, which is in turn determined by the synthetic approach employed. First-order Raman modes are observed at room temperature in STO single-crystalline nanocubes with average edge lengths of 60 and 120 nm, obtained via sol-precipitation coupled with hydrothermal synthesis and a molten salt procedure, respectively. First-order Raman scattering arises from local loss of inversion symmetry caused by surface frozen dipoles, oxygen vacancies, and impurities incorporated into the host lattice. The presence of polar domains is suggested by the pronounced Fano asymmetry of the peak corresponding to the TO2 polar phonon, which does not vanish at room temperature. These noncentrosymmetric domains will likely influence the dielectric response of these nanoparticles.
AB - Raman spectroscopy was used to demonstrate that the lattice dynamics of SrTiO3 (STO) nanoparticles strongly depends on their microstructure, which is in turn determined by the synthetic approach employed. First-order Raman modes are observed at room temperature in STO single-crystalline nanocubes with average edge lengths of 60 and 120 nm, obtained via sol-precipitation coupled with hydrothermal synthesis and a molten salt procedure, respectively. First-order Raman scattering arises from local loss of inversion symmetry caused by surface frozen dipoles, oxygen vacancies, and impurities incorporated into the host lattice. The presence of polar domains is suggested by the pronounced Fano asymmetry of the peak corresponding to the TO2 polar phonon, which does not vanish at room temperature. These noncentrosymmetric domains will likely influence the dielectric response of these nanoparticles.
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U2 - 10.1021/cm801192t
DO - 10.1021/cm801192t
M3 - Article
VL - 20
SP - 5628
EP - 5635
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 17
ER -