標題: Field emission of carbon nanotubes on anodic aluminum oxide template with controlled tube density
作者: Chen, PL
Chang, JK
Kuo, CT
Pan, FM
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 21-三月-2005
摘要: 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/H-2 feed ratio during the CNT growth. We ascribe the variation of the tube density as a function of the CH4/H-2 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/H-2 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. (C) 2005 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.1886260
http://hdl.handle.net/11536/13890
ISSN: 0003-6951
DOI: 10.1063/1.1886260
期刊: APPLIED PHYSICS LETTERS
Volume: 86
Issue: 12
結束頁: 
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