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

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 c-axis 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.