Controllable synthesis, characterization and growth mechanism of three-dimensional hierarchical PbWO4 microstructures
Controllable synthesis, characterization and growth mechanism of three-dimensional hierarchical PbWO4 microstructures
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DOI：
10.1039/c1ce05060e
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发表时间：
2011-07
期刊：
影响因子：
3.1
通讯作者：
H. Tang;Changsheng Li;Haojie Song;Xiaofei Yang;Xuehua Yan
中科院分区：
文献类型：
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作者：
H. Tang;Changsheng Li;Haojie Song;Xiaofei Yang;Xuehua Yan
报道了用水包油微乳液法制备三维(3D)多层结构的PbWO4微结构。用X射线衍射仪、扫描电子显微镜和透射电子显微镜对所制备的PbWO4样品进行了表征。提出了PbWO4可能的三步生长机制，即初始成核、自组装(定向聚集)和随后的晶体生长(Ostwald熟化)，以解释PbWO4微结构的形成。该方法简便、环保，为使用微乳液体系进行材料设计和加工提供了一种新的策略。本文介绍的水包油微乳液技术为合成具有复杂三维结构和独特形貌和性质的其他无机材料提供了有前途的微结构介质。
We report on the synthesis of three-dimensional (3D) hierarchical PbWO4 microstructures by an oil-in-water microemulsion-mediated route. As-prepared PbWO4 samples are characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. A possible three-step growth mechanism of PbWO4, in which initial nucleation, self-assembly (oriented aggregation), and subsequent crystal growth (Ostwald ripening) are involved, is proposed to explain the formation of PbWO4 microstructures based on observations of a time-dependent morphology evolution process. The approach is facile, environmentally friendly, and provides a new strategy in the use of microemulsion systems for material design and processing. The oil-in-water microemulsion technique presented here offers promising microstructured media for the synthesis of other inorganic materials with complex 3D architectures and unique morphologies and properties.