Author/Authors :
Jinquan Wei، نويسنده , , Hongwei Zhu، نويسنده , , Yi Jia، نويسنده , , Qinke Shu، نويسنده , , Chuangang Li، نويسنده , , Kunlin Wang، نويسنده , , Bingqing Wei، نويسنده , , Yanqiu Zhu، نويسنده , , Zhicheng Wang، نويسنده , , Jianbin Luo، نويسنده , , WENJIN LIU، نويسنده , , Dehai Wu، نويسنده ,
Abstract :
This study shows that S concentration in the Fe catalyst plays an important role in controlling the number of graphene layers during carbon nanotube (CNT) growth via chemical vapor deposition. Using different S concentrations, we have grown thin carbon nanotubes with from 1 to 5 layers. Single-walled carbon nanotubes growing from the active surface of an FeS–Fe eutectic were observed. A growth model basing on the HRTEM characterization and thermodynamic analysis is suggested in which the CNT nucleates and grows on the active surface area of the catalyst where S accumulates in the form of an FeS–Fe eutectic, and the S distribution on the catalyst particle surface determines the number of CNT layers.
