Full text loading...
Overall view of an as-prepared cathode surface. Magnification: . Inset: Highly magnified SEM image of typical CNFs (arrow-indicated) grown on the tip of conical protrusions.
Initial characteristics attained for the CNF-covered cathode. Inset: Corresponding FN plot.
Time dependence of the emission-current density. Applied voltage and the electric field: 1000 V and , respectively.
Typical SEM images of central, (a) and (b), and peripheral regions, (c), of the emission area taken after the lifetime test for 40 h. (b) Enlarged image of (a). Insets in (a) and (c): enlarged images of typical rod-like projections with a round tip and entangled CFs newly grown during the FE process. Magnification: for (a) and (c), and for (c).
Article metrics loading...