Multi-wall carbon nanotubes: Purification, morphology and field emission performance

被引：44
|
作者：
Su, Shui-Hsiang [1 ]
Chiang, Wang-Ta [1 ]
Lin, Chun-Chang [1 ]
Yokoyama, Meiso [1 ]
机构：
[1] I Shou Univ, Dept Elect Engn, Ta Hsu Hsiang, Kaohsiung Cty, Taiwan
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 40卷 / 07期
关键词：
multi-wall carbon nanotubes; treatment with acids; field emission;
D O I：
10.1016/j.physe.2007.09.087
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Highly pure multi-wall carbon nanotubes (MWNTs) were successfully fabricated using an acidic purification process. Treatment with acids, concentrated sulfuric acid (H2SO4) and nitric acid (HNO3) eliminated many of the metal catalysts and impurities from MWNTs. The concentration of H2SO4/HNO3 solution and the purification time were optimized. Experimental data demonstrate that a 1:3 concentrated H2SO4:HNO3 solution after 20 h yields highly pure MWNTs. MWNTs were closed tips that are opened after purification. The intensity ratio of the D band to the G band (ID/IG) is as low as 0.27. The field emission current density is as high as 170 mu A/cm(2) at an electric field of 1.9 V/mu m. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：2322 / 2326
页数：5
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