Coating geometries of metals on single-walled carbon nanotubes

被引:31
作者
He, Yu [1 ]
Zhang, Jinyu [1 ]
Wang, Yan [1 ]
Yu, Zhiping [1 ]
机构
[1] Tsinghua Univ, Inst Microelect, Beijing 100084, Peoples R China
关键词
ab initio calculations; aggregates (materials); aluminium; carbon nanotubes; coatings; diffusion barriers; gold; iron; metal clusters; nickel; nucleation; palladium; surface energy; thin films; titanium; wetting; FREE-ENERGY; GRAPHENE; FILMS;
D O I
10.1063/1.3309752
中图分类号
O59 [应用物理学];
学科分类号
摘要
This paper studies the coating geometries of metals on single-walled carbon nanotubes (SWNTs) on the basis of the nucleation theory and wetting theory. The metal surface energy, cohesion energy, diffusion barrier, and metal-SWNT interfacial energy are calculated using first-principles calculation. Metals including Fe, Al, Au, Pd, Ni, and Ti are considered. For Ti, Ni, and Pd, low metal-SWNT interfacial energies and high diffusion barriers are responsible for forming continuous or quasicontinuous layers on the SWNT surface. In contrast, Al and Au have small diffusion barriers and poor SWNT surface wetting, thus they tend to aggregate and form large clusters. Although the binding energy between Fe and SWNTs is large, due to the large cohesion energy and poor wetting, Fe may form isolated clusters. All results are in good agreement with experimental observations.
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页数:3
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