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Schematic diagram showing zigzag, armchair and …

2020-5-29 · Schematic diagram showing zigzag, armchair and chiral carbon nanotubes. From: Moones Rahmandoust and Andreas Öchsner (Faculty of Mechanical Engineering, Universiti Teknologi Malaysia UTM 81310 Johor Bahru, Hohor, Malaysia),

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Schematic diagram showing zigzag, armchair and …

2020-5-29 · Schematic diagram showing zigzag, armchair and chiral carbon nanotubes. From: Moones Rahmandoust and Andreas Öchsner (Faculty of Mechanical Engineering, Universiti Teknologi Malaysia UTM 81310 Johor Bahru, Hohor, Malaysia),

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Distinguishing Zigzag and Armchair Edges on …

2020-1-14 · The zigzag-rich (zigzag/armchair = 4:1) and armchair-rich (zigzag/armchair = 1:4) GNRs could also be distinguished by Raman spectroscopy by determining the presence of G – or G + bands as well as peaks that correspond to C–H vibrations on zigzag edges. These results indicate that planar GNRs can also be distinguished by XPS and Raman ...

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Electrical properties of carbon nanotubes

2020-12-26 · Electrical properties of nanotubes. The electrical properties of carbon nanotubes depend on how the hexagons are orientated along the axis of the tube. The following figure shows the three orientations that are possible: armchair, zigzag, and chiral. Electrical properties depend on the orientation of the hexagons.

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The Electronic Properties of the Graphene and Carbon ...

We examined the graphene and carbon nanotubes in 5 groups according to their structural and electronic properties by using ab initio density functional theory: zigzag (metallic and semiconducting), chiral (metallic and semiconducting), and armchair (metallic). We studied the structural and electronic properties of the 3D supercell graphene and isolated SWCNTs.

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The Electronic Properties of the Graphene and Carbon ...

We examined the graphene and carbon nanotubes in 5 groups according to their structural and electronic properties by using ab initio density functional theory: zigzag (metallic and semiconducting), chiral (metallic and semiconducting), and armchair (metallic). We studied the structural and electronic properties of the 3D supercell graphene and isolated SWCNTs.

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Chirality of single-walled carbon nanotubes | Research ...

2019-10-1 · Chiral vector C can be written as C = n a 1 + m a 2 where a 1 and a 2 are basis vectors of the graphene lattice. The pair of integers (n,m) is called the chiral index or just chirality. This implies that the structure of a single-walled carbon nanotube is completely determined by chirality.

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Chirality of single-walled carbon nanotubes | Research ...

2019-10-1 · Chiral vector C can be written as C = n a 1 + m a 2 where a 1 and a 2 are basis vectors of the graphene lattice. The pair of integers (n,m) is called the chiral index or just chirality. This implies that the structure of a single-walled carbon nanotube is completely determined by chirality.

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A Hybrid Density Functional Study of Zigzag and …

The band gaps of all the different nanotubes that we have studied vary from 0.129 eV (chiral 6, 2) to 1.159 eV (chiral 6, 3). We infer that some chiral SiNTs can possibly indicate metallic behavior. The Mulliken charge analysis shows that zigzag structures has predominantly ionic bonding while armchair and some of the chiral structures are ...

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Communication: Origin of the difference between …

2014-3-7 · Communication: Origin of the difference between carbon nanotube armchair and zigzag ends. Li Y(1), Ahuja R(1), Larsson JA(2). Author information: (1)Applied Material Physics, Department of Materials and Engineering, Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden.

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carbon nanotube | Properties & Uses | Britannica

Under these circumstances, the chiral vectors form a plane perpendicular to the longitude direction of nanotubes and the lengths of the chiral vectors are equal to the circumference. Three different types of SWNTs are distinctly characterized, named “zigzag” (m = 0), “armchair” (n = m), and “chiral.”

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Self-assembled chiral phosphorus nanotubes from ...

Self-assembled chiral phosphorus nanotubes from phosphorene: a molecular dynamics study†. Douxing Pan abc, Tzu-Chiang Wang * b, Chao Wang b, Wei Guo a and Yugui Yao * a a Laboratory of Quantum Functional Material Design and Application, School of Physics, Beijing Institute of Technology, Beijing 100081, China. E-mail: ygyao@bit.edu.cn. b State Key Laboratory of Nonlinear Mechanics, Institute ...

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Band Structures in Zigzag Graphene Nanoribbons and ...

Choose the "full" comparison mode to overlay the two electronic band structures. In this mode, it is seen that, unlike the case of armchair graphene nanoribbons and zigzag carbon nanotubes [2], for a zigzag ribbon and armchair tube the band matching cannot be achieved in the whole Brillouin zone.

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New tricks with nanotubes | Nature

Another puzzle concerns the 1D density of electronic states of chiral nanotubes, which generally have very large unit cells, often ten times larger than armchair or zigzag nanotubes of the same ...

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Electronic and transport properties of nanotubes

This article reviews the electronic and transport properties of carbon nanotubes. The focus is mainly theoretical, but when appropriate the relation with experimental results is mentioned. While simple band-folding arguments will be invoked to rationalize how the metallic or semiconducting character of nanotubes is inferred from their topological structure, more sophisticated tight-binding and ...

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Phonon Dispersion for Armchair and Zigzag Carbon …

Phonon Dispersion for Armchair and Zigzag Carbon Nanotubes. ... So, the primitive lattice translation vectors of CNT are the chiral vector, and the translation vector, which in terms of graphene primitive vectors, are given as: and. Here, , and are integers. The CNT that is obtained by folding the strip OADB will thus consist of two unit cells.