We estimate the optimum electric field at the sheath edge and the minimum interval among nanotubes to promote the growth of armchair-type nanotubes (metallic character) as a function of the nanotube length. On the basis of the electric charge distribution in a nanotube and the optimum electric field E 1* at the tip of a nanotube evaluated using the Hückel-Poisson method, we calculate the structure of the electric field lines outside a nanotube in the sheath region. As the nanotube length increases, E1* decreases. To maintain the chemical activity at the tip, the sheath electric field must be decreased. We show the decreasing rate of the sheath electric field with respect to the nanotube length.
|ジャーナル||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版ステータス||Published - 2006 3月 8|
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