Abstract
Large areas of ZnO horseshoe-shaped nanorods have been fabricated vertically on MgO-coated Si (111) substrates by chemical vapor deposition method. The well-aligned nanorod arrays were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscope (HRTEM), energy-dispersive X-ray spectroscopy (EDS), and photoluminescence spectroscopy (PL). The results show that the nanorods are perfect single crystals with hexagonal wurzite structure along the [0001] growth direction. The nanorods have regular horseshoe shape, and the diameter of the rods rang 70–99nm while the length is about 600nm. The PL spectrum exhibits a strong peak at 500.8nm and two relatively weak emission bands centered at 387.7nm and 648.6nm, which indicates that the ZnO arrays are of excellent optical quality.
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