Controllable Synthesis of Single-Crystalline Fe3O4 Polyhedra Possessing the Active Basal Facets
Controllable Synthesis of Single-Crystalline Fe3O4 Polyhedra Possessing the Active Basal Facets
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DOI：
10.1021/cg700931u
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发表时间：
2008-03
影响因子：
3.8
通讯作者：
B. Geng;J. Ma;J. You
中科院分区：
文献类型：
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作者：
B. Geng;J. Ma;J. You
本文报道了通过简单的水热途径，可控地制备了具有活性基面的Fe3O4微同相十二面体。讨论了微晶的生长机理。从晶体学的观点来看，晶体的形状是由生长速率与方向的比值决定的。前驱体溶液的pH值对产物的形貌有很大影响。当pH值调整为8 ~ 10时，可以得到轮廓清晰的Fe3O4截断微同形十二面体，暴露出活性基面（{110}），尺寸分布窄（<10%）。截断的Fe3O4微同形十二面体的大小与反应时间有关。产品的磁性能对晶体尺寸很敏感。合成的具有活性基面、结构清晰的Fe3O4微晶体在许多领域具有重要的应用前景。
In the present paper, we report on the controllable preparation of single-crystalline Fe3O4 microrhombic dodecahedra possessing the active basal facets in high yield through a facile hydrothermal route. The growth mechanism of the microcrystals is discussed. From a crystallographic point of view, the shapes of the crystals are determined by the ratio of the growth rate along to directions. The pH values of the precursor solution strongly affected the morphologies of the products. When pH value was adjusted to 8–10, well-defined Fe3O4 truncated microrhombic dodecahedra exposing the active basal surfaces ({110}) with narrow size-distribution (<10%) were obtained. The sizes of the Fe3O4 truncated microrhombic dodecahedra are dependent upon the reaction time. The magnetic properties of the products are sensitive to the crystal size. The synthesized well-defined Fe3O4 microcrystals with active basal facets may have important applications in many fields.