Self-Assembled Three-Dimensional Architectures of Y2(WO4)3:Eu: Controlled Synthesis, Growth Mechanism, and Shape-Dependent Luminescence Properties
Self-Assembled Three-Dimensional Architectures of Y2(WO4)3:Eu: Controlled Synthesis, Growth Mechanism, and Shape-Dependent Luminescence Properties
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DOI：
10.1021/cg801068k
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发表时间：
2009-05
影响因子：
3.8
通讯作者：
Lin Xu;Jianmin Shen;Chunliang Lu;Yuping Chen;W. Hou
中科院分区：
文献类型：
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作者：
Lin Xu;Jianmin Shen;Chunliang Lu;Yuping Chen;W. Hou
采用无配体水热法和螯合配体水热法分别合成了具有三维分级结构的单斜晶系Y2（WO4）3：Eu。在无表面活性剂和无模板的过程中获得了从二维纳米片组装的微花，而在将适量的乙二胺四乙酸（EDTA）引入前体后观察到从一维纳米片组装的具有蒲公英状外观的微球。采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）、选区电子衍射（SAED）、能谱（EDS）和光致发光（PL）等手段对产物进行了表征。结果表明，配体用量、反应温度、反应时间以及有机添加剂的种类对产物的形貌有重要影响。
Monoclinic Y2(WO4)3:Eu with three-dimensional hierarchical architectures were successfully synthesized by a hydrothermal method in ligand-free and chelating ligand-mediated processes, respectively. Microflowers assembled from two-dimensional nanoflakes were obtained in a surfactant- and template-free process, whereas microspheres with dandelion-like appearance assembled from one-dimensional nanoplates were observed upon the introduction of the appropriate amount of ethylenediamine tetraacetic acid (EDTA) to the precursor. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), energy-dispersive spectra (EDS), and photoluminescence (PL) spectroscopy were employed to characterize the as-obtained products. It was found that the amount of ligand agent, reaction temperature and time, and type of organic additive have crucial influences on the morphology of the...