Enhanced Electron Filed Emission from Single-Crystalline ZnO Nanoneedles
Enhanced Electron Filed Emission from Single-Crystalline ZnO Nanoneedles
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单晶 ZnO 纳米针的增强电子场发射
DOI：
10.1166/nnl.2013.1672
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发表时间：
2013-10
影响因子：
--
通讯作者：
Yu B H
中科院分区：
文献类型：
--
作者：
Xu J Q;Hou G H;Dong B P;Chang Y Y;Wang Y R;Yan H L;Yu B H
在本文中，我们报道了一种简单的水热合成路线，在温和的反应温度下，没有添加任何表面活性剂的ZnO纳米针。采用X射线粉末衍射（XRD）、拉曼光谱、扫描电镜（SEM）和透射电镜（TEM）对样品的形貌、晶相、微观结构和成分进行了表征。我们的研究结果表明，所获得的ZnO纳米针具有尖锐的尖端是很好的晶体优先在[0002]方向上延伸。光致发光（PL）的生长ZnO纳米针显示两个发射峰分别集中在420和487 nm左右，这两个都源于单离子化的氧空位。场致电子发射研究表明，所制备的样品具有较好的场致发射性能，其开启场为4.75 V/μm，场增强因子为2976，稳定性好。
In this paper, we report the synthesis of ZnO nanoneedles by a facile hydrothermal route at mild reaction temperature without the addition of any surfactant. The X-ray powder diffraction (XRD), Raman spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were sued to characterize the morphologies, crystal phase, microstructures and components of the samples. Our results show that the as-obtained ZnO nanoneedles with sharp tips are well crystallines elongated preferentially in the [0002] direction. Photoluminescence (PL) of as-grown ZnO nanoneedles show two emission peaks centered at around 420 and 487 nm, respectively, both of which originate from the singly ionized oxygen vacancies. Field electron emission studies show that the as-prepared products have good FE performance characterized by lower turn-on field of 4.75 V/μm and high field-enhancement factor 2976 and good stability.