854602.fig.002a
(a)
854602.fig.002b
(b)
854602.fig.002c
(c)
854602.fig.002d
(d)
Figure 2: (a) Schematic diagram to display the fabrication process of a flat-tip CNT emitter. (b) Optical image of a CNT drop on a W tip surface. (c) SEM image of a fabricated flat-tip CNT emitter. Inset: the magnified SEM image of the surface of the emitter. (d) Characterization of the electron beam diameter at the anode position using the emitter shown in (c) and a phosphorous screen.