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Giant field enhancement at carbon nanotube tips induced by multistage effect
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View: Figures


Image of FIG. 1.
FIG. 1.

Multistage growth geometry for nanotubes grown on a carbon fiber. (a), (b), and (c) are subsequent magnifications of the stages.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(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 .

Image of FIG. 4.
FIG. 4.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Giant field enhancement at carbon nanotube tips induced by multistage effect