| ZnO纳米线的自催化生长、微结构和荧光特性 |
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| 引用本文： | 徐昌富,杨利文,杨奇斌.ZnO纳米线的自催化生长、微结构和荧光特性[J].湘潭大学自然科学学报,2008,30(4). |
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| 作者姓名： | 徐昌富 杨利文 杨奇斌 |
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| 作者单位： | 1. 湘潭大学,材料与光电物理学院,湖南,湘潭,411105;湘潭大学,低维材料及其应用技术教育部重点实验室,湖南,湘潭,411105
2. 湘潭大学,材料与光电物理学院,湖南,湘潭,411105 |
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| 基金项目： | 湖南省教育厅资助项目，湘潭大学跨学科资助项目 |
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| 摘 要： | 采用高温碳还原ZnO粉末获得了大量直径约为40 nm的ZnO纳米线.通过X射线衍射、光电子能谱、扫描电镜、透射电镜对其微结构特征进行了深入的研究.结果表明ZnO纳米线的生长机理不同于传统的气-固(Vapor-Solid,VS)生长模式,是典型的自催化气-液-固(Vapor-Liquid-Solid,VLS)生长模式,且反应过程中最初形成的液态纳米颗粒在ZnO纳米线的生长过程中起催化剂作用.荧光光谱表明ZnO纳米线中氧空位缺陷密度大,因而具有强可见光发射.
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| 关 键 词： | ZnO纳米线 气-液-固生长机理 荧光光谱 |
Self-Catalytic Growth, Microstructure and Optical Emission of ZnO Nanowires by Thermal Evaporation Method |
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| XU Chang-fu,YANG Li-wen,YANG Qi-bin.Self-Catalytic Growth, Microstructure and Optical Emission of ZnO Nanowires by Thermal Evaporation Method[J].Natural Science Journal of Xiangtan University,2008,30(4). |
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| Authors: | XU Chang-fu YANG Li-wen YANG Qi-bin |
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| Abstract: | ZnO nanowires with the diameter about 40 nm have been synthesized in high yield by a simple vapor phase transport technique using a mixture of zinc oxide and graphite powders.The structural properties of the prepared ZnO nanowires were studied using X-ray diffraction,field-emission scanning electron microscopy,X-ray photoelectron spectroscopy,and transmission electron microscopy.It is revealed that the growth mechanism of ZnO nanowires is different from the traditional vapor-solid or vapor-liquid-solid(VLS) nucleation model of ZnO nanostructures.The formation process of ZnO nanowires can be elucidated on the basis of a self-catalytic VLS mechanism in which the initial liquid nano-particles play a key role.Photoluminescence spectra exhibit strong green emissions,indicative of high oxygen-vacancy density and excellent electrical conductivity in ZnO nanowires. |
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| Keywords: | ZnO nanowire Vapor-Liquid-Solid Photoluminescence |
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