|
Vol.48, No.4, 335 ~ 342, 2010
|
| Title |
| Purification of Single-walled Carbon Nanotubes by HCl Treatment and Analysis of the Field Emission Property |
| 류승철 Seung Chul Lyu , 정다미 Da Mi Jung , 안기태 Ki Tae Ahn , 이한성 Han Sung Lee , 이내성 Nae Sung Lee , 박윤선 Yun Sun Park , 석중현 Jung Hyun Sok |
|
|
|
| Abstract |
| High-quality single-walled carbon nanotubes (SWCNTs) were synthesized by catalytic decomposition of C2H2 using Fe-Mo/MgO catalyst at 800℃. The as-synthesized SWCNTs typically occurred in the form of a bundle with a diameter of 10~20 nm together with amorphous carbon and catalytic impurities, which were removed by a two-step purification process consisting of oxidation and an acid treatment. The oxidation step, using an O2-Ar mixture at 380℃ for 5 hr in a vertical-type furnace and aHNO3 treatment at 100℃ for one hour, was utilized to remove the amorphous carbon particles. Subsequently, metallic catalysts were removed in HCl at room temperature for 5 hr under magnetic stirring. The SWCNT suspension was prepared by dispersing the purified SWCNTs in an aqueous sodium dodecyl benzene sulfonate solution with horn-type sonication. This was then air-sprayed on glass to fabricate CNT field emitters. The samples had a turn-on field value of 4 V/μm and a current density of 0.67 mA/cm2 at 9 V/μm. Increasing the HCl treatment time improved the field emission properties. (Received October 29, 2009) |
|
|
| Key Words |
| nanostructured materials, purification, electrical properties, activation analysis, carbon nanotube |
|
|
 |
|
