Controllable Hydrothermal Synthesis and Properties of ZnO Hierarchical Micro/Nanostructures.

A simple hydrothermal route has been developed for the fabricating ZnO hierarchical micro/ nanostructure with excellent reproducibility. SEM and TEM analysis show that the hierarchical rod is a single-crystal, suggesting that many single-crystal micro/nanorods are assembled into ZnO hierarchical mi- cro/nanostructures. The morphologies of the hierarchical rods can be conveniently tailored by changing the reaction parameters. And we also found citric acid plays a crucial role in the formation process of ZnO micro/nanostructures. Room-temperature photoluminescence spectra reveals that the ZnO hierarchical mi- cro/nanostructures have a strong emission peak at 440 nm and several weak emission peaks at 420, 471 and 541 nm, respectively. [ABSTRACT FROM AUTHOR]