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Browse Journals & Magazines > Applied Physics Letters ...> Volume:86 Issue:12 Help

Field emission of carbon nanotubes on anodic aluminum oxide template with controlled tube density

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4 Author(s)
Chen, Po-Lin ; Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan ; Chang, Jun-Kai ; Kuo, Cheng-Tzu ; Fu-Ming Pan

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The tube number density of aligned carbon nanotubes (CNTs) grown over the nanoporous anodic aluminum oxide (AAO) template can be directly controlled by adjusting the CH4/H2 feed ratio during the CNT growth. We ascribe the variation of the tube density as a function of the CH4/H2 feed ratio to the kinetic competition between outgrowth of cobalt-catalyzed CNTs from the AAO pore bottom and deposition of the amorphous carbon (a-C) overlayer on the AAO template. A pore-filling ratio of 18% to 82% for the nanotubes overgrown out of nanopores on the AAO template can be easily achieved by adjusting the CH4/H2 feed ratio. Enhanced field emission properties of CNTs were obtained by lowering the tube density on AAO. However, at a high CH4 concentration, a-C by-product deposit on the CNT surface can degrade the field emission property due to a high energy barrier and significant potential drop at the emission site.

Published in:
Applied Physics Letters  (Volume:86 ,  Issue: 12 )

Date of Publication: Mar 2005

Page(s):
123111 - 123111-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.1886260
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Mar 2005

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