期刊
APPLIED SURFACE SCIENCE
卷 255, 期 7, 页码 3972-3976出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2008.10.093
关键词
Nanostructures; Crystal growth; Chemical vapor deposition processes; Zinc oxide; Semiconducting II-VI material
类别
资金
- National Natural Science Foundation of China [50572095]
- National Basic Research Program of China [2006CB604906]
ZnO nanorods and nanonails have been synthesized on silicon wafers by a three-step catalyst-free thermal evaporation method in oxygen atmosphere. All the samples were hexagonal phase ZnO with highly c-axis preferential orientation. Different morphologies of ZnO nanostructures, i.e. ZnO nanorods and two kinds of nanonails, were observed at various temperature regions. Photoluminescence, transmission electron microscopy, and energy-dispersive X-ray spectroscope were employed to elucidate the reason for the formation of such different rod-like structures. The analysis results demonstrated that the caps of nanonails possess a large number of oxygen vacancies, which may play a key role in determining the formation of nanonails and the high intensity of green emission. (C) 2008 Elsevier B. V. All rights reserved.
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