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Vertically self‐aligned conical carbon nanofibers by pulsed discharge plasma chemical vapour deposition and its field electron emission
Author(s) -
Somani Prakash R.,
Somani Savita P.,
Yoshida A.,
Suzeki T.,
Noda M.,
Tanemura M.,
Lau S. P.,
Umeno M.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622493
Subject(s) - field electron emission , chemical vapor deposition , materials science , plasma enhanced chemical vapor deposition , raman spectroscopy , diamond , silicon , plasma , carbon nanofiber , diamond like carbon , carbon fibers , amorphous carbon , analytical chemistry (journal) , graphite , nanofiber , amorphous solid , nanotechnology , electron , thin film , carbon nanotube , optoelectronics , optics , composite material , chemistry , crystallography , physics , chromatography , quantum mechanics , composite number
Vertically self‐aligned conical carbon nanofibers were deposited on silicon coated with thin film of cobalt (100 nm) using pulsed discharge plasma chemical vapor deposition at 400–450 °C. Possible mechanism of their growth is discussed. FE‐SEM observations indicate that they are self vertically well aligned, with an average diameter of about 200 nm at the bottom and with a tip of about 70 to 100 nm in diameter. HR‐TEM, visible Raman and XRD study reveals that the nanofibers have an amorphous structure and are made of diamond like carbon. Field electron emission study indicates a low turn‐on field of about 1.4 V/μm and threshold field of about 4.2 V/μm, suggesting their possible application as field electron emitters. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)