Morphology Evolution of One-Dimensional-Based ZnO Nanostructures Synthesized via Electrochemical Corrosion
Morphology Evolution of One-Dimensional-Based ZnO Nanostructures Synthesized via Electrochemical Corrosion
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DOI：
10.1021/jp9017794
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发表时间：
2009-08
影响因子：
3.7
通讯作者：
K. Zhong;J. Xia;Haohua Li;Chao-lun Liang;Peng Liu;Y. Tong
中科院分区：
文献类型：
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作者：
K. Zhong;J. Xia;Haohua Li;Chao-lun Liang;Peng Liu;Y. Tong
通过一种新的方法可以得到各种形貌的ZnO纳米结构，结合电化学腐蚀三种模式：液膜和以上和以下的水线在部分浸泡。采用X射线衍射（XRD）、高分辨透射电子显微镜（HRTEM）和选区电子衍射（SAED）等手段对样品进行了结构表征。提出了核反应器生长的机理为电化学腐蚀和定向附着，即发生在液膜中或部分浸没在汽膜中。观察了ZnO纳米棒、纳米线、纳米针和纳米枝晶等纳米结构的演变，研究了浓度、反应时间、添加剂、衬底状态、膜厚度和溶剂对ZnO形貌的影响。利用紫外-可见吸收光谱和光致发光（PL）研究了ZnO纳米结构的光学性质。它们的光学带隙随形貌的不同而不同。在所研究的样品中，短纳米棒的光学带隙最大，而大纳米棒的光学带隙最小。PL特性表明，近带发射峰和缺陷相关发光峰基本在同一位置。然而，不同形态的强度是不同的值，短纳米棒表现出最好的近带发射。
Various morphologies of ZnO nanostructures can be obtained through a novel method, incorporating electrochemical corrosion with three modes: liquid membrane and above and below the water line in partial immersion. X-ray diffraction (XRD) patterns, high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) are employed to characterize their structure. The mechanism of the growth of NRs is proposed as electrochemical corrosion and oriented attachment, which occur in a liquid membrane or partial immersion in a vapor membrane. The evolution of ZnO nanostructures such as nanorods, nanowires, nanopins, and nanodentrites is observed, and the influence of concentration, reaction time, additives, state of substrate, membrane thickness, and solvent on the morphology of ZnO is investigated. Optical properties of ZnO nanostructures are studied by using UV―visible absorption spectra and photoluminescence (PL). Their optical gaps vary from different morphologies. Among the studied samples, short nanorods show the largest optical gap, while big nanorods present the smallest value of optical gap. PL properties demonstrate that peaks of near-band emission and defect-related luminescence are basically in the same position. However, intensities for different morphologies are of different values, and short nanorods exhibit the best near-band emissions.