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(a) Top view SEM image of the as-grown honeycomb structure CNT mesh, while (b) shows the image at 45° tilt. (c) Cross sectional SEM image of the VACM array showing uniform, high density, and vertically aligned CNTs. (d) TEM image of multiwall CNTs with a diameter range of 5–15 nm. (e) SEM image of CNT forest, the inset shows the zoom in image. (f) Simulation results of the electric field distribution along “edges” of the honeycomb-shaped VACM array.
(a) Dependency of the FE current density on the applied electric field . Top-right inset shows the corresponding FN plot, left-top inset shows the emission image at a current density of . (b) Stability tests of CNT mesh and CNT forest. The initial current density is .
Accelerated lifetime test of the VACM emitter array and the dependence of the emission current on vacuum level.
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