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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(10) [October 2010] >
| Title: | Optical phonon confinement in ZnO nanorods and nanotubes |
| Authors: | Samuel M, Soosen
Koshy, Jiji
Chandran, Anoop
George, K C |
| Keywords: | ZnO nanorods
ZnO nanotubes
Raman spectroscopy
Optical phonon confinement |
| Issue Date: | Oct-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The structure and
morphology of ZnO nanorods and nanotubes synthesized by hydrothermal method
were studied by TEM, XRD and Raman spectroscopy. The Raman scattering spectra
at room temperature were excited by He-Ne laser with wavelength 633 nm. The
perfect wurtzite structures of ZnO nanorods and nanotubes were verified by the
intense E2 (high) mode. The strong red shifts of phonon
frequencies, broadening of the FWHM of Raman peaks and asymmetry of line shapes
were attributed to phonon confinement effect. An optical phonon confinement
model was used for calculating the theoretical line shapes, asymmetric
broadening and shift of the optical phonons. The results were in good agreement
with the experimental values. Besides the fundamental phonon modes, overtone
and combination modes were also observed because of the anharmonicity effect.
From this study, it was found that the phonon confinement effect was more
obvious in ZnO nanotubes as compared to nanorods. |
| Page(s): | 703-708 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.48(10) [October 2010]
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