Nano-makisu: highly anisotropic two-dimensional carbon allotropes made by weaving together nanotubes

Graphene and carbon nanotubes (CNT) are the representatives of two-dimensional (2D) and one-dimensional (1D) forms of carbon, both exhibiting unique geometric structures and peculiar physical and chemical properties. Herein, we propose a family or series of 2D carbon-based highly anisotropic Dirac m...

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Bibliographic Details
Published in:Nanoscale 2020-01, Vol.12 (1), p.347-355
Main Authors: Zhao, Lei, Liu, Wei, Yi, WenCai, Hu, Tao, Khodagholian, Dalar, Gu, FengLong, Lin, Haiqing, Zurek, Eva, Zheng, Yonghao, Miao, Maosheng
Format: Article
Language:English
Subjects:
Allotropy
Anisotropy
Carbon
Carbon nanotubes
Charge density
Chemical properties
Cones
Coupling (molecular)
Covalent bonds
Electronic properties
Electronic structure
Fermions
First principles
Graphene
Heavy elements
Molecular dynamics
Molecular structure
Nanoelectronics
Organic chemistry
Ribbons
Spin-orbit interactions
Tapes (metallic)
Transport properties
Weaving
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Summary:Graphene and carbon nanotubes (CNT) are the representatives of two-dimensional (2D) and one-dimensional (1D) forms of carbon, both exhibiting unique geometric structures and peculiar physical and chemical properties. Herein, we propose a family or series of 2D carbon-based highly anisotropic Dirac materials by weaving together an array of CNTs by direct C-C bonds or by graphene ribbons. By employing first-principles calculations, we demonstrate that these nano-makisus are thermally and dynamically stable and possess unique electronic properties. These 2D carbon allotropes are all metals and some nano-makisus show largely anisotropic Dirac cones, causing very different transport properties for the Dirac fermions along different directions. The Fermi velocities in the k x direction could be ∼170 times higher than those in the k y direction, which is the strongest anisotropy among 2D carbon allotropes to the best of our knowledge. This intriguing feature of the electronic structure has only been observed in heavy element materials with strong spin-orbit coupling. These results indicate that carbon based materials may have much broader applications in future nanoelectronics. Two-dimensional Dirac carbon materials with the strongest anisotropy are constructed by spontaneously interlinking single-walled carbon nanotubes along the radial directions.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr08069d