Abstract
Temperature dependent Raman scattering of the E2(low) and E2(high) modes of ZnO nanoparticle powder samples has been investigated. The dynamics exhibited by the ZnO nanoparticles, the E2 modes, follow single crystal like behavior but with strong cubic or/and quadratic anharmonicity by supporting additional channels for immediate lattice relaxation. The strong anharmonic character associated with the E2 modes reflects enhanced thermal conductivity of the ZnO nanoparticles. An anomalous variation in linewidth of the E2(low) mode is observed and is attributed to the superposition of the large displacement field, associated with the surface atoms of the nanoparticles and the lattice mode.
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