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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
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.48(10) [October 2010]

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