Two dimensional Dirac carbon allotropes from graphene

Nanoscale ◽  
2014 ◽  
Vol 6 (2) ◽  
pp. 1113-1118 ◽  
Author(s):  
Li-Chun Xu ◽  
Ru-Zhi Wang ◽  
Mao-Sheng Miao ◽  
Xiao-Lin Wei ◽  
Yuan-Ping Chen ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Carbon Allotropes

scholarly journals Nanoribbons with Non-Alternant Topology from Fusion of Polyazulene: Carbon Allotropes Beyond Graphene

2019 ◽  
Author(s):  
Qitang Fan ◽  
Daniel Martin-Jimenez ◽  
Daniel Ebeling ◽  
Claudio K. Krug ◽  
Lea Brechmann ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Low Temperature ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Scanning Probe ◽  
Two Dimensional ◽  
Reaction Step ◽  
Functional Theory ◽  
Carbon Allotropes ◽  
Temperature Scanning

Various two-dimensional (2D) carbon allotropes with non-alternant topologies, such as pentaheptites and phagraphene, have been proposed. Predictions indicate that these metastable carbon polymorphs, which contain odd-numbered rings, possess unusual (opto)electronic properties. However, none of these materials has been achieved experimentally due to synthetic challenges. In this work, by using on-surface synthesis, nanoribbons of the non-alternant graphene allotropes, phagraphene and tetra-penta-hepta(TPH)-graphene have been obtained by dehydrogenative C-C coupling of 2,6-polyazulene chains. These chains were formed in a preceding reaction step via on-surface Ullmann coupling of 2,6-dibromoazulene. Low-temperature scanning probe microscopies with CO-functionalized tip and density functional theory calculations have been used to elucidate their structural properties. <br>

Analysis of Graphene Based on Femtosecond Probing

2013 ◽  
Vol 785-786 ◽  
pp. 406-409
Author(s):  
Hong Cui ◽  
Xian Bin Zhang ◽  
Qi Jun Liang ◽  
Jun Fei Su ◽  
Peng Yang ◽  
...  
Keyword(s):  
Time Delay ◽  
Frequency Spectrum ◽  
Building Block ◽  
High Speed ◽  
Oscillation Amplitude ◽  
Two Dimensional ◽  
Carbon Allotropes ◽  
Graphene Films ◽  
Terahertz Spectrum ◽  
Scan Rate

Graphene is the two-dimensional building block for carbon allotropes of every other dimensionality. We report the terahertz spectrum of Non-uniform graphene films based femtosecond probing with more than 6 THz spectral coverage and the 1 GHz resolution using high-speed asynchronous optical sampling, and it operates at 2 kHz scan rate without a mechanical delay stage. The overall waveform creates shock and the oscillation amplitude reached 0.37E-4 mV, main-peaks time delay is 151.83fs between graphene and substrate, frequency spectrum oscillatory fades at 2.8 THz and appeared obvious absorption peak.

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

Nanoscale ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 347-355 ◽  
Author(s):  
Lei Zhao ◽  
Wei Liu ◽  
WenCai Yi ◽  
Tao Hu ◽  
Dalar Khodagholian ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Materials ◽  
Single Walled Carbon Nanotubes ◽  
Two Dimensional ◽  
Carbon Allotropes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Two-dimensional Dirac carbon materials with the strongest anisotropy are constructed by spontaneously interlinking single-walled carbon nanotubes along the radial directions.

Nanoribbons with Non-Alternant Topology from Fusion of Polyazulene: Carbon Allotropes Beyond Graphene

2019 ◽  
Author(s):  
Qitang Fan ◽  
Daniel Martin-Jimenez ◽  
Daniel Ebeling ◽  
Claudio K. Krug ◽  
Lea Brechmann ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Low Temperature ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Scanning Probe ◽  
Two Dimensional ◽  
Reaction Step ◽  
Functional Theory ◽  
Carbon Allotropes ◽  
Temperature Scanning

Various two-dimensional (2D) carbon allotropes with non-alternant topologies, such as pentaheptites and phagraphene, have been proposed. Predictions indicate that these metastable carbon polymorphs, which contain odd-numbered rings, possess unusual (opto)electronic properties. However, none of these materials has been achieved experimentally due to synthetic challenges. In this work, by using on-surface synthesis, nanoribbons of the non-alternant graphene allotropes, phagraphene and tetra-penta-hepta(TPH)-graphene have been obtained by dehydrogenative C-C coupling of 2,6-polyazulene chains. These chains were formed in a preceding reaction step via on-surface Ullmann coupling of 2,6-dibromoazulene. Low-temperature scanning probe microscopies with CO-functionalized tip and density functional theory calculations have been used to elucidate their structural properties. <br>

Twin T-graphene: a new semiconducting 2D carbon allotrope

2020 ◽  
Vol 22 (18) ◽  
pp. 10286-10294 ◽  
Author(s):  
Debaprem Bhattacharya ◽  
Debnarayan Jana
Keyword(s):  
Two Dimensional ◽  
Carbon Allotrope ◽  
Carbon Allotropes ◽  
Significant Interest

Two dimensional carbon allotropes with multiple atomic layers have attracted significant interest recently.

Prediction of two planar carbon allotropes with large meshes

2016 ◽  
Vol 18 (2) ◽  
pp. 1172-1177 ◽  
Author(s):  
ShuangYing Ma ◽  
L. Z. Sun ◽  
K. W. Zhang
Keyword(s):  
First Principles ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Carbon Allotropes ◽  
Planar Carbon

Two novel two-dimensional (2D) carbon allotropes named Cy and Cz with large meshes are predicted based on first-principles calculations.

Failure of Graphdiyne: Structurally Directed Delocalized Crack Propagation

2013 ◽  
Vol 80 (4) ◽  
Author(s):  
Dieter B. Brommer ◽  
Markus J. Buehler
Keyword(s):  
Mechanical Properties ◽  
Crack Propagation ◽  
Failure Mechanisms ◽  
Fracture Analysis ◽  
Two Dimensional ◽  
Main Subject ◽  
Carbon Allotropes ◽  
Original Direction ◽  
Device Applications ◽  
The Many

Among the many potential two-dimensional carbon allotropes inspired by graphene, graphynes have received exceptional attention recently. Graphynes exhibit remarkable mechanical properties depending on their structure. The similar structure and two-dimensional nature of these materials yield many properties that are similar to those of graphene, but the presence of heterogeneous bond types is expected to lead to distinct properties. The main subject of this work is graphdiyne, one of the few graphynes that has been fabricated in large quantities. In this paper, we perform fracture analysis on graphdiyne and find a delocalized failure mechanism in which a crack propagates along a diagonal with respect its original direction. The covalence of the material allows for this simple but intriguing phenomenon to be investigated. Graphene is also tested to compare the behavior. This mechanism has implications for the toughness and robustness of this material, which is topical for many device applications recently proposed in the literature. Further, connections of such delocalized failure mechanisms are made to that of hidden length and sacrificial bonding in some biological systems such as proteins, bone, and nacre.

A new two-dimensional all-sp3 carbon allotrope with indirect band gap and superior carrier mobility

2021 ◽  
Author(s):  
Xing Yang ◽  
Yuwei Wang ◽  
Ruining Xiao ◽  
Tao Wen ◽  
Yulin Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Band Gap ◽  
Carrier Mobility ◽  
Two Dimensional ◽  
Carbon Allotrope ◽  
Carbon Allotropes ◽  
Indirect Band Gap

The success of fascinating graphene has motivated much interest in exploiting new two-dimensional (2D) carbon allotropes with excellent electronic and mechanical properties such as graphdiyne and penta-graphene. However, there is...

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