Morphological Control of Single Crystalline Co3O4 Polyhedrons: Selective and Nonselective Growth of Crystal Planes Directed by Differently Charged Surfactants and Solvents
Morphological Control of Single Crystalline Co3O4 Polyhedrons: Selective and Nonselective Growth of Crystal Planes Directed by Differently Charged Surfactants and Solvents
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DOI：
10.1021/cg9012284
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发表时间：
2010-02
影响因子：
3.8
通讯作者：
Jinhu Yang;Takehiko Sasaki
中科院分区：
文献类型：
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作者：
Jinhu Yang;Takehiko Sasaki
采用不同电荷的表面活性剂和溶剂，采用水热法制备了球形、纳米立方体和菱形十二面体等Co3O4单晶。在计算立方体和菱形十二面体的{100}和{110}带电晶面的电荷密度、原子密度和偶极矩的基础上，我们提出了改变的封顶剂与Co3O4晶面的特定相互作用导致了{100}取向的立方体和{110}取向的菱形十二面体的选择性形成。研究还发现，带电平面的本征结构可能不仅影响Co3O4晶体的结晶过程和最终形貌，而且还影响Co3O4粒子的组装行为。Co3O4晶体属于典型的尖晶石结构，在封顶剂的指导下，基于本征结构的结晶习性有可能推广到类似结构的其他晶系，以获得最佳的结晶性能。
Single-crystalline Co3O4 crystals such as spheres, nanocubes, and rhombododecahedrons were obtained hydrothermally by employing differently charged surfactants and solvents. On the basis of calculations (charge density, atom density, and dipolar moment) on involved charged crystal planes of {100} for the cubes and {110} for the rhombododecahedrons, we proposed that the specific interactions between changed capping agents and crystal planes of Co3O4 led to the selective formation of cubes with {100} orientation and rhombododecahedrons with {110} orientation, respectively. It was also found that the intrinsic structure of charged planes affected possibly not only the crystallization processes and final morphologies of Co3O4 crystals but also the assembly behaviors of Co3O4 particles. Being in a typical spinel structure, the crystallization habits of Co3O4 crystals based on intrinsic structure directed by capping agents are possibly extended to other crystal systems in a similar structure, to get an optimize...