(a) SEM image of as-grown ZnO tetrapods. (b) HRTEM image of a leg of a ZnO tetrapod, the lattice spacing is . (c) Powder XRD pattern of as-grown ZnO tetrapods.
Typical SEM image of the screen-printed and sintered cathode.
FE current density as a function of applied field ( plot) of the ZnO-tetrapod sample, and the inset is the logarithmic FN plot.
Emission current as a function of time recorded for ZnO-tetrapod sample biased at . The inset is the corresponding luminescence image of anode.
Characters displayed by the as-fabricated diode FED.
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