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Abstract: ZnO nanorod arrays with different morphologies have been synthesized on the zinc foil via a simple hydrothermal method which is both a convenient and inexpensive process. The key influencing factors including the solution concentration and the reaction time are all studied and compared carefully. Based on our investigation, it is found that the morphologies of ZnO crystals could be controlled and the transition of different morphologies is also realized successfully with the growing reaction time. Furthermore, the as-grown ZnO nanorods are single crystalline with a wurtzite structure. Finally, a reasonable mechanism to explain the different crystal morphologies is also discussed in detail. [Copyright &y& Elsevier]

Abstract: A simple aqueous solution route has been successfully employed to prepare large-scale arrays of ZnO nanorods on the zinc foil without the assistance of any template, oxidant or coating of metal oxide layers. It is found that the growth of ZnO nanorod arrays with different densities, diameters and morphologies is dependent on the ammonia concentration and zinc precursor. The different morphologies of the ZnO nanostructures attained with or without adding Zn2+-contained salt in the alkaline solution are compared in the paper. The possible growth mechanism concerning the growth of the different ZnO nanocrystal morphologies is also discussed. [Copyright &y& Elsevier]