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Comparison of field-electron emission from different carbon nanotube array structures
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View: Figures


Image of FIG. 1.
FIG. 1.

Plan view of VACNT-column arrays with square (a), triangular (b), and hexagonal (c) symmetries, respectively, and (d) 2D contour plot of the electric field distribution at the top surfaces of the VACNT columns in a square array with the pitch-to-height ratio of 0.5 and height-to-diameter ratio of 1.

Image of FIG. 2.
FIG. 2.

Electric field distribution along the respective cut lines in Figs. 1(a)–1(c) for (a) square, (b) triangular, and (c) hexagonal VACNT-column arrays with 0.5 pitch-to-height ratio and identical column diameter. Position on the cut line is defined from bottom to top.

Image of FIG. 3.
FIG. 3.

Plan-view SEM images of fabricated VACNT-column arrays. The identical diameter for all VACNT columns is , and the respective pitch distances are 400, 650, and for square, triangular, and hexagonal geometries.

Image of FIG. 4.
FIG. 4.

Current density vs applied field curves (a) and the corresponding FN plots (b) of VACNT-column arrays of square, triangular, and hexagonal symmetries. The diameter of and pitch of were identical for three VACNT-column arrays, and the respective heights were 423, 403, and for the square, hexagonal, and triangular VACNT-column arrays.

Image of FIG. 5.
FIG. 5.

Temporal variation in the emission current density at the dc electric field of from a hexagonal VACNT-column array. The net current after the stabilization was about .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison of field-electron emission from different carbon nanotube array structures