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http://dx.doi.org/10.3365/KJMM.2011.49.1.079

Field Emission Property of Double-walled Carbon Nanotubes Related to Purification and Transmittance  

Ahn, KiTae (Department of Nano Science & Technology, University of Seoul)
Jang, HyunChul (Department of Nano Science & Technology, University of Seoul)
Lyu, SeungChul (Department of Nanotechnology, University of Seoul)
Lee, Hansung (Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University)
Lee, Naesung (Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University)
Han, Moonsup (Department of Physics, University of Seoul)
Park, Yunsun (Department of Industrial and management Engineering, Myongi University)
Hong, Wanshick (Department of Nano Science & Technology, University of Seoul)
Park, Kyoungwan (Department of Nano Science & Technology, University of Seoul)
Sok, Junghyun (Department of Nano Science & Technology, University of Seoul)
Publication Information
Korean Journal of Metals and Materials / v.49, no.1, 2011 , pp. 79-84 More about this Journal
Abstract
Double-walled carbon nanotubes (DWCNTs) with high purity were produced by the catalytic decomposition of tetrahydrofuran (THF) using a Fe-Mo/MgO catalyst at $800^{\circ}C$. The as-synthesized DWCNTs typically have catalytic impurities and amorphous carbon, which were removed by a two-step purification process consisting of acid treatment and oxidation. In the acid treatment, metallic catalysts were removed in HCl at room temperature for 5 hr with magnetic stirring. Subsequently, the oxidation, using air at $380^{\circ}C$ for 5 hr in the a vertical-type furnace, was used to remove the amorphous carbon particles. The DWCNT suspension was prepared by dispersing the purified DWCNTs in the aqueous sodium dodecyl sulfate solution with horn-type sonication. This was then air-sprayed on ITO glass to fabricate DWCNT field emitters. The field emission properties of DWCNT films related to transmittance were studied. This study provides the possibility of the application of large-area transparent CNT field emission cathodes.
Keywords
nanostructured materials; vapor deposition; electrical properties; Raman spectroscopy; carbon nanotube;
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