Abstract
ZnO one-dimensional nanostructures were synthesized using the vapour-liquid-solid (VLS) process. Highly C-axis oriented ZnO nanowires, exhibiting a gold droplet on their top, were observed by scanning electron microscopy. Growth mechanisms are discussed, and the issue of supersaturation and precipitation of zinc in the gold droplet is debated. Transmission electron microscopy was carried out to investigate the crystalline properties and the polarity of the synthesized structures. In particular, an unexpected result shows that VLS ZnO nanowires grow with O-polarity, whereas spontaneous (catalyst-free) ZnO nanowires grow with Zn-polarity. The process at the origin of this polarity inversion is discussed.
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