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Raman studies of optical phonons in vertical cadmium sulfide nanorod arrays

Published online by Cambridge University Press:  03 March 2011

Dongjuan Xi
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, California 90095
Jianzhong Li
Affiliation:
SETI Institute, NASA Ames Research Center, Moffett Field, California 94035
Qibing Pei
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, California 90095
Bin Chen
Affiliation:
SETI Institute, NASA Ames Research Center, Moffett Field, California 94035
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Abstract

Electrochemically grown cadmium sulfide (CdS) nanorod arrays were studied with Raman spectroscopy. The resonant Raman spectroscopy unravels the enhanced electron-phonon interaction up to the fifth-order multiphonon process in the vertically aligned CdS nanorods after annealing. Resonant Raman scattering at room temperature reveals a surface phonon mode at 253 cm−1 in the annealed nanorod. This unprecedented observation is accounted for by the lateral confinement in the nanorod whose average aspect ratio is approximately 5. An intersubband transition near 3000 cm−1 is also observed. These results point to important optoelectronic applications of this material.

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Copyright © Materials Research Society 2006

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