Abstract
The unique bouquet-like ZnO arrays were successfully synthesized via a two-step route. First, flower-like ZnO arrays were prepared by a hydrothermal reaction. Then the bouquet-like structure was obtained by the selective etching of the ZnO nano-flowers in NaCl aqueous solution. Each ZnO bouquet was composed of many tube-like petals radiating from the center outwards. Based on the experimental evidences, a possible mechanism involving face-selective etching and defect-selective etching was proposed for the formation of bouquet-like ZnO arrays. It was found that the distribution of defects played a critical role in the structure of petals of ZnO bouquets. Photoluminescence (PL) spectrum of the bouquet-like ZnO arrays exhibited two emission bands, including a strong ultraviolet (UV) emission at 382nm and a weak visible emission band centered at 532nm.
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