TITLE

Optical properties of single-crystalline ZnO nanowires on m-sapphire

AUTHOR(S)
Ng, Hou Tee; Chen, Bin; Li, Jun; Han, Jie; Meyyappan, M.; Wu, J.; Li, S. X.; Haller, E. E.
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/31/2003, Vol. 82 Issue 13, p2023
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
ZnO nanowires have been synthesized using a catalyst-assisted heteroepitaxial carbothermal reduction approach on a m-sapphire substrate. Intricate and uniform arrays have been obtained with each nanowire forming an angle ∼30° with the substrate normal. Photoluminescence studies at room temperature for wavelengths between 335 and 620 nm reveal a strong single exciton peak at ∼380 nm (3.26 eV) with accompanying deep-level blueshifted emission peaks at ∼486, 490, and 510 nm. UV resonant Raman spectroscopy has been used to characterize the nanowires at room temperature with multiphonon scattering exhibiting phonon quantum confinement.
ACCESSION #
9377471

 

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