Facile synthesis, metastable phase induced morphological evolution and crystal ripening, and structure-dependent photocatalytic properties of 3D hierarchical anatase superstructures.
Facile synthesis, metastable phase induced morphological evolution and crystal ripening, and structure-dependent photocatalytic properties of 3D hierarchical anatase superstructures.
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DOI：
10.1021/am506684c
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发表时间：
2014-12
影响因子：
9.5
通讯作者：
Guoliang Li;Qiuwen Chen;J. Lan
中科院分区：
文献类型：
--
作者：
Guoliang Li;Qiuwen Chen;J. Lan
在不使用任何结构导向添加剂的情况下，通过简单的溶剂热方法成功制备了具有可进化形态和可调节尺寸的独特的三维分层锐钛矿TiO2超结构。提出了一个复杂的组装过程，包括新生纳米颗粒的成核，微小纳米晶体的团聚和有序附着，以及亚稳晶相诱导的再生，这是锐钛矿超结构的形成和形态演变。结果表明，晶相经历了从半晶到中晶的成熟过程，其形态从牡丹状到菊花状，最终演变为球形结构。所获得的三维分层锐钛矿TiO2超结构对有机污染物的降解表现出优异的光催化活性，这在很大程度上归因于其独特结构更有效的光捕获能力和高比表面积。
Unique 3D hierarchical anatase TiO2 superstructures with evolvable morphologies and tunable sizes were successfully fabricated through a facile solvothermal route without using any structure-directing additives. A complex assembly process involving nucleation of nascent nanoparticles, agglomeration and ordered attachment of tiny nanocrystals, and regrowth induced by metastable crystal phase was put forward for the formation and morphology evolution of the anatase superstructures. It was revealed the crystalline phase experienced a ripening process from semicrystal to mesocrystal status accompanying the morphologies evolving from peony-like to chrysanthemum-like and eventually to spherical structures. The obtained 3D hierarchical anatase TiO2 superstructures exhibited superior photocatalytic activities for organic pollutant degradation, which could be largely attributed to the more efficient light-harvesting ability and the high specific surface area of the unique structures.