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SEM images of the ZnO nanoneedles grown on the substrate. (a) The SEM image of the ZnO nanoneedles which have cone-shaped tips and the diameters of . (b) The magnified SEM image of the ZnO nanoneedles. (c) Top view of the ZnO nanoneedles, which is not vertical in direction but a little tilted direction, and have the density of about . (d) The magnified SEM image of top view of the ZnO nanoneedles.
XRD pattern of the ZnO nanoneedles grown on the substrate. It shows several peaks at 34.42°, 38.18°, 38.48°, 68.85°, 69.11°, 69.32°, and 72.59° corresponding to ZnO(0002), Au(111), Ti(110), , , , and ZnO(0004), respectively. The inset shows a magnified image of the peaks between 68° and 70°.
TEM images of a ZnO nanoneedle grown on the substrate. (a) The TEM image of the ZnO nanoneedle with a sharp-curvature tip. (b) The HRTEM image of the ZnO nanoneedle exhibiting lattice fringes clearly observed.
Field emission properties of the ZnO nanoneedles grown on the substrate. The inset shows the FN plots.
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