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Brightness of electron beam emitted from a single pentagon on a multiwall carbon nanotube tip
Author(s) -
Hata Koichi,
Takakura Akihiro,
Ohshita Akinori,
Saito Yahachi
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1729
Subject(s) - pentagon , carbon nanotube , field electron emission , brightness , electron , nanotube , common emitter , materials science , nanotechnology , cathode ray , molecular physics , optics , chemistry , optoelectronics , physics , geometry , mathematics , quantum mechanics
Abstract A capped multiwall carbon nanotube with a clean surface gives field emission patterns consisting of six pentagonal rings corresponding to pentagons located at the tip. To evaluate the optical properties of a single pentagon as an electron source, the I – V characteristics and angular current densities for a single clean pentagon have been measured by probe‐hole‐type field emission microscopy. Reduced brightness estimated from the angular current density and the geometrical size of the pentagon reached ∼5.6 × 10 9 A m −2 sr −1 V −1 at an emission current of 53 nA. This value is one order of magnitude or more higher than that of an individual multiwall carbon nanotube field emitter reported by Jonge et al. Copyright © 2004 John Wiley & Sons, Ltd.