In the past decade, considerable interest has been shown in the preparation and study of functional materials based on one-dimensional ZnO nanostruc-tures (rods, tubes, whiskers, etc.), which are widely used in electronic and optoelectronic devices [1], gas and ion-selective sensors [2, 3], field transistors [4], and solar cells [5], and as photocatalysts [6]. There are several routes for preparation of zinc oxide nanorod arrays. The most widely used ones are chemical vapor deposition [7] and hydrothermal route [8]. In contrast to the former, hydrothermal treatment is carried out at relatively low temperatures and allows one to vary within wide limits the shape and size of the resulting nanorods by changing temperature and solution composition. One of the most promising but inadequately studied methods of hydrothermal synthesis of zinc oxide is growth of ZnO nanostructures on a zinc metal substrate in the presence of organic reagents, such as ethylenediamine (EDA) [9] and formamide [10]. This route makes it possible to obtain semiconducting nanostructure arrays on conducting metallic substrates and the resulting materials can be used in optoelectronic devices.
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