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Phys Rev Lett. 2006 Aug 25;97(8):085502. Epub 2006 Aug 25.

Low frequency Raman scattering from acoustic phonons confined in ZnO nanoparticles.

Author information

  • 1Department of Physics and Astrophysics, University of Delhi, Delhi-110007, India.

Erratum in

  • Phys Rev Lett. 2007 Jan 12;98(2):029902.

Abstract

We report here the first observation of the low frequency Raman scattering from acoustic phonons in semiconducting zinc oxide (ZnO) nanoparticles without embedding in any solid matrix. ZnO nanoparticles (size 5-10 nm) with nearly spherical shape have been synthesized using a chemical route. A shift in the phonon peaks toward higher frequencies along with broadening was observed with a decrease in particle size. The size dependence of the acoustic phonons in ZnO nanoparticles is explained using Lamb's theory that predicts the vibrational frequencies of a homogeneous elastic body of spherical shape. Our results show that the observed low frequency Raman scattering originates from the spherical (l = 0) and quadrupolar vibrations (l = 2) of the spheroidal mode due to the confinement of acoustic vibrations in ZnO nanoparticles.

PMID:
17026314
[PubMed]
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