Ion-beam-induced sharpening of ZnO nanotips

Wu, Pan; Saraf, Gaurav; Yicheng Lu; Hill, David H.; Bartynski, Robert A.; Arena, Dario A.; Mee-Yi Ryu; Raley, Jeremy A.; Yung Kee Yeo
August 2004
Applied Physics Letters;8/16/2004, Vol. 85 Issue 7, p1247
Academic Journal
Fe ions of dose 5×1016 cm-2 were implanted at 200 keV 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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