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Illustration of the assembly procedure of a single carbon nanotube emitter. (a) Initial configuration of a platinum surface and a nanotube encapsulating a platinum particle on a copper plate, (b) nanowelding of the nanotube tip to the platinum surface, and (c) fabrication of a single nanotube emitter by retracting the copper plate.
(a)–(e) Time-sequential series of high-resolution images of a nanowelding procedure of a multiwalled carbon nanotube to a platinum surface. The dark regions at top A and bottom B show the platinum surface and a platinum particle encapsulated in the nanotube, respectively. The bright regions are vacuums. (f) Low magnification image of a single nanotube emitter fabricated by retracting the copper plate.
Current-voltage curve of the carbon nanotube shown in Fig. 2(e). The conductance at around is .
(a) Current-voltage curves measured during electron field emission from the carbon nanotube of Fig. 2(f) at various tip-anode distances , 50, 124, 241, and . (b) Fowler-Nordheim plots obtained from the current-voltage curves in (a). (c) Field enhancement factor against the distance .
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