Ferromagnetism of double-walled carbon nanotubes

被引：19
作者：
Yan, Der-Chung [1 ]
Chen, Shih-Yun [2 ]
Wu, Maw-Kuen [3 ]
Chi, C. C. [1 ]
Chao, J. H. [4 ]
Green, Malcolm L. H. [5 ]
机构：
[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
[2] Natl Taiwan Univ Sci & Technol, Dept Polymer Engn, Taipei 10607, Taiwan
[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[4] Nation Tsing Hua Univ, Nucl Sci & Technol Dev Ctr, Hsinchu 30013, Taiwan
[5] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 24期
关键词：
carbon nanotubes; catalysts; chemisorption; ferromagnetism; filling; hydrogen; magnetic moments; METAL IODIDES; DEFECTS;
D O I：
10.1063/1.3453867
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The pure double-walled carbon nanotubes (DWNTs) and two endohedral DWNTs (DWNTs with materials filled inside) are produced. The filling materials are CoI(2) and KI, respectively. The ferromagnetism (FM) is observed in pure DWNTs. The content of residual catalyst Fe is too small to be responsible for the observed FM. On the other hand, after filling KI or CoI(2) into the tubes, over 87% of FM is suppressed. This suggests that the origin of FM in nanotubes is mainly from the hydrogen chemisorptions induced in the process of acid purification. With the knowledge of FM origin, it is then possible to enhance FM of carbon nanotubes or graphene for applications relying on magnetism. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3453867]
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页数：3
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