Abstract
Large-area arrays of copper oxide (CuO) nanorods were self-catalyzed and selectively grown on a CuTaNSi assembly by combining vacuum-arc Cu deposition and vapor-solid reaction. X-ray-diffraction spectra showed the peaks of Cu films and CuO nanorods, respectively. Field-emission scanning electron microscopy images showed semialigned CuO nanorods with diameters of ∼40-80 nm. High-resolution transmission electron microscopy images showed the structure of individual CuO nanorods and their [111] growth direction. Auger electron spectroscopy depth profiles showed the elemental distribution of the CuOa-TaNSi assembly. X-ray photoelectron spectrometry identified the chemical nature of the CuO nanorods. Their electron field-emission properties are discussed from the current-density-voltage curves and Fowler-Nordheim plots. © 2006 American Vacuum Society.