花状ZnO超细结构的水热自组装

Self-assembly of ZnO Nanorod Bundles into Flowerlike Architectures by a Simple Hydrothermal Route

通过简单的水热合成路线,合成出由ZnO纳米棒束组装的花状结构.其组成结构单元ZnO纳米棒沿[001]晶向生长,呈很好的单晶结构.大部分纳米棒直径约为500nm,长约6.0μm.研究结果表明,在无水乙二胺存在的条件下,氨水(28%,v/v)在ZnO花状结构的形成过程中起到了至关重要的作用.调节氨水的含量,组成结构单元ZnO纳米棒可以组装成不同的花状结构.当加入氨水的量使得溶液的pH值达到10时,即可得到由ZnO纳米棒束组装成的花状结构,并简单讨论了这种花状结构的形状结构的形成机理.

The self-assembly of ZnO nanorod bundles into interesting flowerlike architectures were achieved via a simple hydrothermal route. The as-prepared samples were characterized by X-ray powder diffraction （XRD）, scanning electron microscope （SEM）, and high-resolution transmission electron microscope （HRTEM）. The composed ZnO nanorods, as self-assembly building blocks, are single crystals nature with the caxis growth crystallographic direction. And most of them have diameters of 500nm and lengths of 6.0μm. The results indicate that commercial ammonia （28%） plays an important role in the formation of the flowerlike architectures in the present of ethylenediamine. When pH value is about 10 adjusted by the addition of ammonia, self-assembly of ZnO nanorod bundles into flowerlike architectures are obtained. With the further increase of the content of ammonia, self-assembly of ZnO nanorods into different flowerlike architectures are synthesized. A possible growth mechanism of the flowerlike ZnO architectures is proposed.