Single-crystalline ZnO nanowires with diameters of about 20 nm and lengths of over 2 µm (aspect ratio >100:1) have been successfully synthesized by a simple hydrothermal treatment of zincnitrate and hexamethylenetetramine aqueous solution at relatively low temperature, i.e. 95 oC. It has been found that solution concentrations of 5 mM or above were favourable for nanorod synthesis, while lower concentrations resulted in formation of thin nanowires. The mechanism of this kind of growth will be discussed and suggested for localization of the nanowire growth. The crystal structure, morphology and the electrical properties of the so grown ZnO nanowires will also be characterized by transmission electron microscopy, scanning electron microscopy and current-voltage measurement, respectively.

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