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A comparative study of field emission from NanoBuds, nanographite and pure or N‐doped single‐wall carbon nanotubes
Author(s) -
Kleshch V. I.,
Susi T.,
Nasibulin A. G.,
Obraztsova E. D.,
Obraztsov A. N.,
Kauppinen E. I.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000212
Subject(s) - field electron emission , materials science , carbon nanotube , cathode , common emitter , homogeneity (statistics) , graphite , doping , field emission display , current density , nanotechnology , carbon fibers , optoelectronics , electron , composite material , electrical engineering , composite number , statistics , physics , mathematics , quantum mechanics , engineering
Field emission characteristics of multi‐emitter flat cathodes prepared from NanoBuds, few‐layer graphite flakes (nanographite, NG) and pure or N‐doped single‐wall carbon nanotubes (SWNTs) have been examined. The cathodes demonstrated a low‐voltage electron emission with the threshold field values of few Volts per micron, which were ascribed to the high‐aspect ratio of nanocarbons. The films of NanoBuds and NG possess excellent emission pattern homogeneity with an emission site density of more than 10 5 cm −2 . This is much higher than for cathodes made of conventional SWNT films. It was found that the achievable maximal current density depends on the type of carbon material and reaches 10 A/cm 2 for NanoBuds film, while for the NG film cathodes, it is about one order of magnitude less. Possible mechanisms responsible for the experimentally observed differences are discussed. The materials examined are of great interest due to their high‐emission characteristics and are promising for the development of new types of vacuum electronic devices.