SEM images of the ZnO nanowires on W tips. (a) The ZnO nanowires with hexagonal end facets (the inset shows the existence of small tips on the end facets); (b) the electron diffraction pattern; (c) the nanowires after heating. (The scale bars in (a), (c), and the inset of (a) are 10, 1, and , respectively.)
FEM patterns from the ZnO nanowires on a W tip. [(a), (c), and (d)] The W tip was tilted to the left; (the voltages were 1.05, 1.01, and , respectively). (e) the W tip was tilted to the right; (the voltage was ). [(b) and (f)] The relative position of the W tip to the screen. (The size of the W tip compared to the screen has been greatly exaggerated.)
Normalized electric fields around the (0001) facet of a ZnO nanowire by simulation.
behaviors of the ZnO nanowires on a W tip. Curves 1, 2, and 3 were obtained before any heat treatment, after the first heat treatment and after the second heat treatment, respectively. (a) the behavior; (b) the FN plots.
FEM patterns respectively obtained before and after the new heat treatment. (a) Before any heat treatment (the voltage was .); [(b)–(g)] after the first heat treatment (The voltages were 0.96, 1.04, 1.07, 1.10, 1.11, and , respectively); (h) after the second heat treatment (the voltage was ).
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