Journal of Crystal Growth, April 1, Vol.415, p.106(5)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jcrysgro.2015.01.003 Byline: Moges Tsega, Dong-Hau Kuo, F.B. Dejene Abstract: Vertically aligned undoped and Pb-doped ZnO (ZnPbO) nanorods have been successfully synthesized by a thermal evaporation-oxidation method with the Fe-based catalysts on sapphire substrate at different temperatures (600-700[degrees]C) for 2h. Effects of growth temperature and Pb-doping on the morphology, structure, and optical properties of as deposited nanorods have been investigated. The products at 600-700[degrees]C showed a 1D nanorod morphology with an average diameter in the range 450-150nm, and length in the range 3-6[mu]m. Well-aligned, uniform and elongated nanorods were obtained at 700[degrees]C. The photoluminescence (PL) spectra showed that undoped ZnO nanorods exhibited a strong and sharp ultraviolet (UV) band edge emission peak at 380nm (3.26eV), whereas Pb-doped ZnO nanorod arrays exhibited a relative weak ultraviolet (UV) emission at 380nm and a strong green emission at 515nm (2.41eV). A mechanism for the nanorod growth and defect emission is proposed. Author Affiliation: (a) Department of Physics, University of the Free State (Qwaqwa campus), Private Bag x13, Phuthaditjhaba 9866, South Africa (b) Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan Article History: Received 31 October 2014; Revised 17 December 2014; Accepted 5 January 2015 Article Note: (miscellaneous) Communicated by: Prof. K. Nakajima
Photoluminescence – Methods ; Photoluminescence – Optical Properties ; Photoluminescence – Analysis ; Oxidation-Reduction Reactions – Methods ; Oxidation-Reduction Reactions – Optical Properties ; Oxidation-Reduction Reactions – Analysis
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