Self-Assembly of Graphene on Carbon Nanotube Surfaces

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作者
Kaiyuan Li
Gyula Eres
Jane Howe
Yen-Jun Chuang
Xufan Li
Zhanjun Gu
Litong Zhang
Sishen Xie
Zhengwei Pan
机构
[1] University of Georgia,College of Engineering and Department of Physics and Astronomy
[2] Northwestern Polytechnic University,Science and Technology on Thermostructural Composite Materials Laboratory
[3] Oak Ridge National Laboratory,Materials Science and Technology Division
[4] Chinese Academy of Sciences,Laboratory for Bio
[5] Chinese Academy of Sciences,Environmental Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics
来源
Scientific Reports | / 3卷
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摘要
The rolling up of a graphene sheet into a tube is a standard visualization tool for illustrating carbon nanotube (CNT) formation. However, the actual processes of rolling up graphene sheets into CNTs in laboratory syntheses have never been demonstrated. Here we report conformal growth of graphene by carbon self-assembly on single-wall and multi-wall CNTs using chemical vapor deposition (CVD) of methane without the presence of metal catalysts. The new graphene layers roll up into seamless coaxial cylinders encapsulating the existing CNTs, but their adhesion to the primary CNTs is weak due to the existence of lattice misorientation. Our study shows that graphene nucleation and growth by self-assembly of carbon on the inactive carbon basal plane of CNTs occurs by a new mechanism that is markedly different from epitaxial growth on metal surfaces, opening up the possibility of graphene growth on many other non-metal substrates by simple methane CVD.
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