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Some features of aligned CVD carbon nanotubes for electron field emission
Author(s) -
Bartsch K.,
Graff A.,
SchöpsDörfel V.,
Leonhardt A.,
Knapp W.
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.1710
Subject(s) - carbon nanotube , field electron emission , materials science , cobalt , carbon fibers , catalysis , metal , chemical engineering , nanotechnology , carbon nanotube supported catalyst , carbon nanofiber , composite material , electron , chemistry , metallurgy , organic chemistry , composite number , physics , quantum mechanics , engineering
Bundles of vertically grown multi‐walled carbon nanotubes were deposited on thin cobalt catalyst layers and heterogeneous WC–Co hard metal surfaces. Two different structures were detected for these layers (tubular and bamboo‐like structures), which are related to the size of the catalyst particles formed and the temperature during the process. Furthermore, free‐standing carbon nanotubes were obtained on WC–Co hard metal surfaces with a reduced Co content. Field emission measurements yielded better results for the bundle‐like carbon nanotube layers. After repeated tests, degradation of the layers was observed. Possible reasons for these effects are discussed. Copyright © 2004 John Wiley & Sons, Ltd.