Theory of phonon properties in doped and undoped CuO nanoparticles

We have studied the phonon properties of CuO nanoparticles and have shown the importance of the anharmonic spin-phonon interaction. The Raman peaks of CuO nanoparticles shift to lower frequency and become broader as the particle size decreases in comparison with those of bulk CuO crystals owing to size effects. By doping with different ions, in dependence of their radius compared to the host ionic radius the phonon energies omega could be reduced or enhanced. The phonon damping is always enhanced through the ion doping effects. (C) 2012 Elsevier B.V. All rights reserved.