Clarification of growth mechanism of carbon nanotubes by arc plasma evaporation

采用电弧等离子体蒸发法制备了单壁高晶态碳纳米管，其中包括Ni和Y催化剂。测量了电弧等离子体中C2、Ni和Y物种的光发射强度随电弧电流的变化关系。用Mie散射谱研究了碳电极蒸发产生的颗粒的行为。用拉曼光谱和透射电子显微镜对合成的碳纳米管的结晶度进行了评价。根据光发射光谱和Mie散射光谱获得的信息，结合对产物的评价，提出了高质量碳纳米管的弧等离子体蒸发生长模型。

High-crystalline single-walled carbon nanotubes were mass-produced using arc plasma evaporation of carbon electrodes including Ni and Y catalysts. Optical emission intensities corresponding to C2, Ni and Y species in the arc plasma were measured as a function of arc current. The behaviors of particles yielded by evaporation of carbon electrode were also investigated using Mie scattering spectroscopy. Crystallinity of synthesized carbon nanotubes was evaluation using Raman spectroscopy and transmission electron microscopy observation. On the basis of the information obtained using optical emission spectroscopy and Mie scattering spectroscopy combined with the evaluation of products, growth model of high-quality carbon nanotubes using arc plasma evaporation was proposed.