Synthesis-dependent first-order Raman scattering in SrTiO3 nanocubes at room temperature

Federico A. Rabuffetti, Hack Sung Kim, James A. Enterkin, Yingmin Wang, Courtney H. Lanier, Laurence D. Marks, Kenneth R. Poeppelmeier, Peter C. Stair

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107 Citations (Scopus)

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 languageEnglish
Pages (from-to)5628-5635
Number of pages8
JournalChemistry of Materials
Volume20
Issue number17
DOIs
Publication statusPublished - Sep 9 2008

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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