Arora, M. and Pant, R. P.
(2011)
Spatial confinement of optical phonons in ZNO nanowalls and nanorods.
Journal of Nano- and Electronic Physics, 3 (1).
pp. 814-817.
ISSN 2077-6772
Abstract
FT Raman spectrum of ZnO nanowalls and nanorods showed optical phonon and
multiphonon peaks of E2 (high) and E2 (low), E1 (TO and LO) and A1 (TO and LO),
2E2, [E2 + A1(LO)], [E1 (LO) + A1(TO)] and [E1(TO) + A(LO)] modes at (108.9 and
434.46 cm-1), (415.24 and 583.32), (383.49 and 574.84), 215.43, 676.24, 956.02 and
998.98 cm-1 respectively. In nanowalls, the appearance of B2 Raman inactive mode at
276.46 cm-1 is attributed to the existence of built in electric field in the crystallites of
ZnO. The weak bands at 516.78 and 467.56 cm – 1 confirmed the presence of highly
localized modes near the grain boundaries having electric field within the grains close
to grain boundary The broadening and asymmetry of the first order E2 (high) optical
phonon mode reveal the spatial confinement of optical phonons.
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