Giant magnetic moment at open ends of multiwalled carbon nanotubes

The attractions of cantilevers made of multiwalled carbon nanotubes（MWNTs） and secured on one end are studied in the non-uniform magnetic field of a permanent magnet. Under an optical microscope, the positions and the corresponding deflections of the original cantilevers（with iron catalytic nanopart...

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Published inChinese physics B Vol. 24; no. 1; pp. 418 - 422
Main Author 王钢 陈闽江 余芳 薛磊江 邓娅 张键 齐笑迎 高燕 褚卫国 刘广同 杨海方 顾长志 孙连峰
Format Journal Article
LanguageEnglish
Published 2015
Subjects
Attraction
Deflection
Iron
Magnetic fields
Magnetic moment
Multi wall carbon nanotubes
Nanoparticles
Permanent magnets
光学显微镜
多壁碳纳米管
巨磁矩
悬臂
永久磁铁
纳米颗粒
自由端
非均匀磁场
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Summary:The attractions of cantilevers made of multiwalled carbon nanotubes（MWNTs） and secured on one end are studied in the non-uniform magnetic field of a permanent magnet. Under an optical microscope, the positions and the corresponding deflections of the original cantilevers（with iron catalytic nanoparticles at the free end） and corresponding cut-off cantilevers（the free ends consisting of open ends of MWNTs） are studied. Both kinds of CNT cantilevers are found to be attracted by the magnet, and the point of application of force is proven to be at the tip of the cantilever. By measuring and comparing deflections between these two kinds of cantilevers, the magnetic moment at the open ends of the CNTs can be quantified.Due to the unexpectedly high value of the magnetic moment at the open ends of carbon nanotubes, it is called giant magnetic moment, and its possible mechanisms are proposed and discussed.
Bibliography:The attractions of cantilevers made of multiwalled carbon nanotubes（MWNTs） and secured on one end are studied in the non-uniform magnetic field of a permanent magnet. Under an optical microscope, the positions and the corresponding deflections of the original cantilevers（with iron catalytic nanoparticles at the free end） and corresponding cut-off cantilevers（the free ends consisting of open ends of MWNTs） are studied. Both kinds of CNT cantilevers are found to be attracted by the magnet, and the point of application of force is proven to be at the tip of the cantilever. By measuring and comparing deflections between these two kinds of cantilevers, the magnetic moment at the open ends of the CNTs can be quantified.Due to the unexpectedly high value of the magnetic moment at the open ends of carbon nanotubes, it is called giant magnetic moment, and its possible mechanisms are proposed and discussed.
Wang Gang,Chen Min-Jiang,Yu Fang,Xue Lei-Jiang,Deng Ya,Zhang Jian,Qi Xiao-Ying,Gao Yan,Chu Wei-Guo,Liu Guang-Tong,Yang Hai-Fang,Gu Chang-Zhi,Sun Lian-Feng（ 1.National Centre for Nanoscience and Technology, Beijing 100190, China ;2. University of Chinese Academy of Sciences, Beijing 100049, China ;3. College of Computer Science and Technology, Shandong University of Technology, Ziho 255049, China ;4. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China）
carbon nanotubes; open ends; giant magnetic moment
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/1/016202