Abstract
Fe ions of dose 5×1016cm−2 were implanted at 200keV into ZnO nanotips at room temperature. Scanning electron microscopy images show that the implanted ZnO tips are much sharper than the as-grown ones. The sharpening effect of the ZnO nanotips is attributed to the interplay between ion sputtering and ion-induced surface diffusion. X-ray diffraction indicates that ZnO crystallinity was preserved during implantation. Photoluminescence measurements show development of a broad blue band and severe UV quenching upon ion bombardment, and partial recovery after annealing. X-ray absorption spectroscopy is consistent with Fe ions that are substitutional for Zn in the ZnO wurtzite lattice.
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