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Mechanism of Carbon Nanotubes Aligning along Applied Electric Field |
| MA Shao-Jie;GUO Wan-Lin |
| Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 |
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| Cite this article: |
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MA Shao-Jie, GUO Wan-Lin 2008 Chin. Phys. Lett. 25 270-273 |
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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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Received: 18 July 2007
Published: 27 December 2007
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