Growth mechanism, photoluminescence, and field-emission properties of ZnO nanoneedle arrays |
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Authors: | Zhang Zengxing Yuan Huajun Zhou Jianjun Liu Dongfang Luo Shudong Miao Yanming Gao Yan Wang Jianxiong Liu Lifeng Song Li Xiang Yanjuan Zhao Xiaowei Zhou Weiya Xie Sishen |
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Institution: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100080, P. R. China. |
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Abstract: | ZnO nanoneedle arrays have been grown on a large scale with a chemical vapor deposition method at 680 degrees C. Zn powder and O(2) gas are employed as source materials, and catalyst-free Si plates are used as substrates. Energy-dispersive X-ray and X-ray diffraction analyses show that the nanoneedles are almost pure ZnO and preferentially aligned in the c-axis direction of the wurtzite structure. The growth mechanism of ZnO nanoneedle arrays is discussed with the thermodynamic theory and concluded to be the result of the co-effect of the surface tension and diffusion. Photoluminescence spectrum of the as-grown products shows a strong emission band centering at about 484 nm, which originates from oxygen vacancies. Field-emission examination exhibits that the ZnO nanoneedle arrays have a turn-on voltage at about 5.3 V/microm. |
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