Raman spectra acquired from spherical, cubic, and cuboid ${\mathrm{SnO}}_2$ nanocrystals (NCs) reveal a morphologically independent Raman mode at $\sim 302{\mathrm{cm}}^{-1}$ . The frequency of this mode is slightly affected by the NC size, but the intensity increases obviously with decreasing NC size. By considering the dipole changes induced by oxygen vacancies and derivation based on the density functional theory and phonon confinement model, an oxygen vacancy density larger than 6% is shown to be responsible for the transformation of the IR to Raman active vibration mode, and the intensity enhancement is due to strong phonon confinement.

© 2011 Optical Society of America

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