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Vol.49, No.1, 79 ~ 85, 2011
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| Title |
| Field Emission Property of Double-walled Carbon Nanotubes Related to Purification and Transmittance |
| 안기태 Ki Tae Ahn , 장현철 Hyun Chul Jang , 류승철 Seung Chul Lyu , 이한성 Han Sung Lee , 이내성 Nae Sung Lee , 한문섭 Moon Sup Han , 박윤선 Yun Sun Park , 홍완식 Wan Shick Hong , 박경완 Kyoung Wan Park , 석중현 Jung Hyun Sok |
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| 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℃. 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℃ 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. |
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| Key Words |
| nanostructured materials, vapor deposition, electrical properties, Raman spectroscopy, carbon nanotube |
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