电弧放电法中碳纳米管的微结构控制  

Controlling the Microstructures of Carbon Nanotubes in Arc Discharge

作　　者：杨华[1] 唐东升[2] 胡晖[3] 解思深[4] 

机构地区：[1]湖南大学计算机与通信学院,中国长沙410083 [2]湖南师范大学物理与信息科学学院,中国长沙410081 [3]湖南大学机械与汽车工程学院,中国长沙410083 [4]中国科学院物理研究所,中国北京100080

出　　处：《湖南师范大学自然科学学报》2006年第1期37-40,共4页Journal of Natural Science of Hunan Normal University

基　　金：湖南省教育厅青年基金资助项目(050503)

摘　　要：通过分析不同放电条件下得到的阴极沉积物形貌和微结构,提出整体温度较低的沉积物边缘具有较高的局部温度和较大的碳离子流;并提出阴极上存在两种电子反射机制:边缘区域的冷阴极场致电子发射,引起边缘硬壳的形成;中心区域的热电子发射,为碳纳米管的生长提供必要的条件.By investigating the morphologies and microstructures of the cathode deposits prepared by self-sustained arc discharge between graphite rods, it is pointed out that there are two electron emission mechanisms occurring on the cathode： field emission and thennionic emission. The former occurs mainly on the edge of the growing surface, by which we can explain the formation of the outer hard shell of the cathode deposit, while the latter occurs mainly on the growing surface except for the edge area and it is the main cause for the growth of carbon nanotubes.

关 键 词：电弧放电 碳纳米管 微结构 电子发射 

分 类 号：O648.3[理学—物理化学]