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Multistage growth geometry for nanotubes grown on a carbon fiber. (a), (b), and (c) are subsequent magnifications of the stages.
Multistage geometry of a nanotube attached to a conical Au rod. (a) and (b) are the low and medium magnification images, respectively; (c) is the TEM micrograph of the nanotube and a schematic drawing showing the field-emission setup.
(Color online) Field enhancement factors for nanotubes and , extracted from FN plots. (a) The small gap regime, nanotube (solid circles) and nanotube (crosses). The solid and dashed lines are interpolations using Eq. (4). (b) Data in the wide range of (both small and large gap regimes) for nanotube (solid circles). The + line represents a fit, by using Eq. (8), with .
(a). An experimental configuration for field emission measurement, with a nanotube attached to a cathode (bottom). (b) A model of the experimental configuration shown in (a), used to calculate the electric field. (c) A simple model of a two-stage emitter.
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