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SEM morphologies of zinc oxide agavelike (a), pencil-like (b), and hierarchical (c) structures. The insets are the single structure. (d) shows XRD of (a).
Field emission current densities of three 1D ZnO micro- and nanostructural emitters as a function of the macroscopic electronic field (a) and the corresponding Fowler-Nordheim plots of the field emission current densities (b).
Schematic illustration of the agavelike structure (a), pencil-like structure (b), and hierarchical structure (c).
The optical images of emitting sites of the agavelike structure (a), pencil-like structure (b), and hierarchical structure (c).
A comparison of two values and geometrical factors of three structures.
A comparison of the field emission parameters of various 1D emitters (ZnO agavelike nanowires is our case).
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