镍粒子在单壁碳纳米管生成中的催化机制  

Catalytic Mechanism of Ni Particles in the Formation of Single-Wall Carbon Nanotubes

作　　者：崔玉亭[1] 王万录[1] 廖克俊[1] 刘高斌[1] 赵作峰[1] 

机构地区：[1]重庆大学理学院应用物理系,重庆400044

出　　处：《重庆大学学报（自然科学版）》2002年第8期4-6,共3页Journal of Chongqing University

摘　　要：用CVD法制备单壁碳纳米管 ,一般加入镍金属颗粒作为催化剂。由于镍金属颗粒不同晶体表面对碳原子的吸附具有不同的活性 ,在制备单壁碳纳米管时 ,导致镍颗粒 (液态 )吸附的碳原子在其表面由活性小的晶面活性大的晶面扩散并沉积 ,结果围绕镍金属颗粒形成空腔 ,单壁碳纳米管得以生成。在单壁碳纳米管生长过程中 ,镍原子作为替位式原子 ,总是处在碳纳米管六角网络的最外端 ,起着缺陷稳定剂的并促进其生成。笔者阐述了镍金属颗粒催化剂的催化机制 ,并对单壁碳纳米管产物的形貌作了合理解释。Usually Ni_clusters are served as catalyst in the formed processo f the single_wall carbon nanotubes by CVD. Because the different surfaces of Ni_clusters have different activity,carbon atoms adsorbed in Ni_clusters (liquid states)will be diffused from low_activity surfaces of Ni_cluster to high_activity ones and be deposited. As a result,the caves of carbon atoms surrounding the Ni_clusters are formed and the single_wall carbon nanotubes are produced. In addition,Ni_atoms served as substitutional atoms always located in the furthest outside of the network of single_wall carbon nanotubes are produced. In addition, Ni_atoms served as substitutional atoms always located in the furthest outside of the network of single_wall carbon nanotubes,and play a role of stabilization in growth of nanotubes,and promot their growth. Therefore,the catalytic mechanism of Ni_clusters as catalyst is introduced,and different morphologies of single_wall carbon nanotubes are also exlained.

关 键 词：镍粒子 CVD 单壁碳纳米管 催化机制 生长机制 

分 类 号：O613.71[理学—无机化学] TB383[理学—化学]