ZnO one-dimensional (1D) nanostructures have been grown on sapphire substrates, and characterized by scanning electron microscopy and transmission electron microscopy (TEM). Samples were realized by metalorganic chemical vapor deposition (MOCVD) using diethyl-zinc, N₂O, ditertiarybutyl-selenide, and bismethylcyclopentadienyl-magnesium, as the zinc, oxygen, selenium and magnesium sources, respectively. Samples include : ZnO hexagonal rods and conical nanoneedles, ZnO/ZnSe core/shell 1D structures, ZnMgO nanowires, and "Vapor-Liquid-Solid (VLS) grown" ZnO nanowires using gold droplets as the catalyst.

Structural characterizations are presented for the different ZnO based nanostructures. Details of their microstructure are given by TEM analysis. In particular, we observed : i) excellent structural properties of the ZnO needles from their base up to the end of the tip, ii) core/shell structures exhibiting wurzite (ZnO) and zincblend (ZnSe) crystals with a well-defined interface (figure1), and iii) the presence of gold in the VLS grown ZnO wires, as revealed by X-ray energy dispersive spectroscopy.

Figure 1 : TEM image of a ZnO/ZnSe core/shell nanowires

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