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

Applied Physics Letters - Tập 82 Số 13 - Trang 2023-2025 - 2003
Hou T. Ng1, Bin Chen1, Jun Li1, Jie Han1, M. Meyyappan1, Junqiao Wu2, S. X. Li2, E. E. Häller2
1NASA Ames Research Center, Moffett Field, California, 94035
2Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720

Tóm tắt

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.

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Applied Physics Letters

Tập 82 Số 13

2023-2025

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