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Low-magnification SEM image of the as-grown tetrapod-like ZnO nanostructures.
Typical TEM image of a single leg of individual tetrapod-like ZnO nanostructures: (a) top part of the leg, scale bar: , (b) side part of the leg. The high-resolution TEM image clearly indicates the single crystalline structures.
SEM image of the tetrapod-like ZnO nanostructures painted on a highly doped Si substrate covered with of Au. The inset shows one individual tetrapod-like ZnO nanostructure.
(a) Field emission curves measured at different distances between the substrate and the anode (, 200, 300, 400, 600, and ). (b) Corresponding FN plots of the emission current in (a).
Stability of the emission current. The voltage was increased from to within and then fixed at . After , the current was kept almost constant for three days. The inset shows fluctuations of the emission current.
Current over time recorded for the tetrapod-like ZnO nanostructures directly painted on a highly doped Si substrate.
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