(a) SEM image of a single ZnO nanowire field emitter attached on a Pt sharp tip. (b) SEM image of a single ZnO nanowire field emitter grown on a Pt sharp tip. (c) SEM image of ZnO nanowires field emitter grown on a Pt blunt tip. (d) TEM image of Pt tip shown in (b). (e) HRTEM image of a single ZnO nanowire shows that it is a single-crystal nanowire. The inset shows the selected area electron diffraction pattern at the base of the nanowire.
behavior of single ZnO nanowire field emitter shown in Fig. 1(b). Voltage is swept-up (black line) from at step size before sweep-down (gray line). The inset shows the respective FN plots.
FEM pattern of single ZnO nanowire field emitter taken at phosphor screen bias of .
(a) FEM pattern of multiple ZnO nanowire emitter at room temperature. (b)–(d) FEM patterns at elevated tip temperatures.
(a) FN plots of ZnO nanowire right after thermal annealing at for , after 3 doses of exposure to with /dose at and after 6 doses of exposure to with /dose at . [(b)–(d)] Different behaviors of the adsorbate-free ZnO nanowire emitter after thermal-field desorption.
(a) curves of ZnO nanowire emitter after annealing at for (left), after exposure (center), and after exposure (right). Voltage was swept-up (black) at before being swept-down (gray). is anode bias at FE current. (b) The FE current at constant anode bias of before UV illumination, during UV illumination and post-UV illumination at vacuum level of .
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