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Field emission properties of macroscopic single-walled carbon nanotube strands
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Image of FIG. 1.
FIG. 1.

Optical (a) and SEM images (b) and (c) of the SWNT strands used for the field emission measurements. Centimeters long SWNT strands are shown in (a); SEM observations show that these SWNT strands are made up of well-aligned SWNT bundles (b), scale-bar ; numerous upward SWNT bundles can be seen in the top view of the tip of a SWNT strand, and the diameter of the SWNT bundles is approximately (c), scale-bar .

Image of FIG. 2.
FIG. 2.

Characteristic plots of the electron emission current as a function of the applied electric field for a SWNT strand with different heights , inset is the corresponding FN plots.

Image of FIG. 3.
FIG. 3.

The emission stability of a SWNT strand under a vacuum of at room temperature with an initial emission current of (corresponding to a current density of ) in .


Generic image for table
Table I.

The height , threshold electric field , and enhancement factors of a SWNT strand. is defined as the applied electric field to obtain a emission current density of ; is the total enhancement factor calculated from the FN plot; is the enhancement factor related to the aspect ratio of the macroscopically long SWNT strand and is calculated from (Ref. 14); and is related to the diameter; length, and packing density of the SWNT bundles composing the SWNT strand, and is calculated from .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Field emission properties of macroscopic single-walled carbon nanotube strands