Growth and properties of ZnO nanorod and nanonails by thermal evaporation |
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Authors: | Mingxia Qiu Liping Zhu Binghui Zhao |
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Affiliation: | State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China |
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Abstract: | 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. |
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Keywords: | 79.60.Jv 81.16.&minus c 81.15.Gh 73.61Ga |
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