Open AccessGrowth and field emission properties of vertically aligned carbon nanofibers
Author(s) -
C.H.P. Poa,
S. J. Henley,
G. Y. Chen,
A. A. D. T. Adikaari,
Cristina E. Giusca,
S. Ravi P. Silva
Publication year - 2005
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.1899225
Subject(s) - field electron emission , materials science , chemical vapor deposition , carbon nanofiber , annealing (glass) , radius , nanofiber , thin film , laser , carbon fibers , nanotechnology , carbon nanotube , analytical chemistry (journal) , electron , composite material , optics , chemistry , composite number , physics , computer security , chromatography , quantum mechanics , computer science
Vertically aligned carbon nanofibers (VACNFs) were synthesized on Ni-coated Si substrates using a dc plasma-enhanced chemical-vapor deposition system. The size of the Ni islands used as catalyst to grow the VACNFs was formed by both thermal annealing and laser processing on thin metal layers. It was observed that the diameter of the carbon nanofibers is strongly dependent on the initial Ni island dimension. By varying the laser power from 228 to 279mJ∕cm2, the size of these Ni islands can be controlled independent of the initial Ni film thickness. Electron field-emission results show that the emission threshold field is dependent on both the height and radius of these VACNFs and also field shielding effects. Threshold fields as low as 2V∕μm was obtained from the sample with the largest height over radius ratio.
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