| Mechanism of Carbon Nanotubes Aligning along Applied Electric Field |
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| 作者姓名： | 马少杰 郭万林 |
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| 作者单位： | Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 |
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| 基金项目： | Supported by the National Basic Research Programme of China under Grant No 2007CB936204, the Ministry of Education of China under Grant No 705021 and IRT0534, the National Natural Science Foundation of China under Grant No 10732040, and the Natural Science Foundation of Jiangsu Province. |
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| 摘 要： | The mechanism of single-walled carbon nanotubes （SWCNTs） aligning in the direction of external electric field is studied by quantum mechanics calculations. The rotational torque on the carbon nanotubes is proportional to the difference between the longitudinal and transverse polarizabilities and varies with the angle of SWCNTs to the external electric field. The longitudinal polarizability increases with second power of length, while the transverse polarizability increases linearly with length. A zigzag SWCNT has larger longitudinal and transverse polarizabilities than an armchair SWCNT with the same diameter and the discrepancy becomes larger for longer tubes.
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| 关 键 词： | 碳纳米管 电场取向 量子力学计算 纳米技术 |
| 收稿时间： | 2007-07-18 |
Mechanism of Carbon Nanotubes Aligning along Applied Electric Field |
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| MA Shao-Jie,GUO Wan-Lin.Mechanism of Carbon Nanotubes Aligning along Applied Electric Field[J].Chinese Physics Letters,2008,25(1):270-273. |
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| Authors: | MA Shao-Jie GUO Wan-Lin |
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| Affiliation: | Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 |
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| Abstract: | The mechanism of single-walled carbon nanotubes (SWCNTs) aligning in the direction of external electric field is studied by quantum mechanics calculations. The rotational torque on the carbon nanotubes is proportional to the difference between the longitudinal and transverse polarizabilities and varies with the angle of SWCNTs to the external electric field. The longitudinal polarizability increases with second power of length, while the transverse polarizability increases linearly with length. A zigzag SWCNT has larger longitudinal and transverse polarizabilities than an armchair SWCNT with the same diameter and the discrepancy becomes larger for longer tubes. |
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| Keywords: | 73 63 Fg 77 22 Ej |
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