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SEM top view images of (a) as-grown CNTs and the CNTs with droplets of the ACa corresponding to a thickness of (b) 50 nm, (c) 300 nm, and (d) 500 nm, respectively, and annealed at . (The inset shows a cross-sectional image of each sample, the scale bar corresponds to ) (e) Schematic diagram showing the mechanism for the deposition and agglomeration of ACa on the CNT emitters.
Emission current density as a function of the applied field and FN plot (inset) obtained from an as-grown and three different ACa coated CNTs.
. The field enhancement factor (hollow circle) and current density (filled circle) as a function of the average tip radius.
The parameters obtained from the experimental results of SEM analysis and the characteristics. is the field enhancement factor, which was calculated from the slope of FN plot and the work function of CNTs and and 4.5 eV, respectively.
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