纳米管束的合成及结构

用电弧法制备出纳米管及纳米管束，并用高分辨电镜观察其结构．观察到的纳米管管子中空，管壁平行，间距0．34nm，端部封闭；还观察到单层纳米管，洋葱球以及内包晶核的洋葱球结构，纳米管束微结构为纳米管．用扫描电镜观察，为明显的针状晶须，定向排列，晶须互相平行，平行于电场方向生长，晶须直径0．2～0．6mm，长度3～8mm．生成纳米管束的原因可能是由于掺杂碳棒中的杂质提供了晶须生长的晶核．

Synthesis and Structure of Graphitic Buckybundles

The synthesis and the structure of graphitic nanotubes and buckybundles were studied by DC arc- discharge method and high resolution electron microscope respectively.The nanotubes are concentric tubings, 0.34nm between the consecutive carbon-layers in the nanotube walls and closed at the ends. The single-layered nanotubes, graphitic onion and the onion-shaped structure encapsulated with crystal nuclei were also observed. The microscopic structure of buckybundles is the same as that of nanotubes. Micrograph showes that the buckybundles are whiskers 0.2-0.6mm in diameter and 3-8mm in length,and orient in the direction of the electric field. The formation of buckybundles is supposed to be induced by crystal nuclei due to the presence of impurities in the doped graphitic rods.