Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 12, Pages 2784-2788Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.09.019
Keywords
ZnO nanotube; electrochemical/chemical synthesis; etch; photoluminescence; cathodoluminescence
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Arrays of ZnO nanotube (ZNT) were prepared by a two-step electrochemical/chemical process on a transparent, conductive substrate from an aqueous solution at 85 degrees C. The as-grown ZNTs are single crystals with wurtzite structure and have good crystalline state. The tubular morphology was formed by the proton generated from anodic splitting of water and defect-selective etching of the electrodeposited ZnO nanorod (ZNR) along the c-axis. The photoluminescence and cathodoluminescence spectra of the ZNT arrays show two emission bands located in the ultraviolet (UV) and visible region, respectively. It was found that the PL intensity in the UV band as well as the ratio of I-uv-/I-visible increased with increasing of the excitation intensity. (C) 2007 Elsevier B.V. All rights reserved.
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