Chiral-Angle Distribution for Separated Single-Walled Carbon Nanotubes

Nano Letters ◽  
2008 ◽  
Vol 8 (10) ◽  
pp. 3151-3154 ◽  
Author(s):  
Yuta Sato ◽  
Kazuhiro Yanagi ◽  
Yasumitsu Miyata ◽  
Kazu Suenaga ◽  
Hiromichi Kataura ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Angle Distribution ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

BUCKLING BEHAVIOR OF SHORT MULTI-WALLED CARBON NANOTUBES UNDER AXIAL COMPRESSION LOADS

2012 ◽  
Vol 12 (06) ◽  
pp. 1250045 ◽  
Author(s):  
A. H. KORAYEM ◽  
W. H. DUAN ◽  
X. L. ZHAO ◽  
C. M. WANG
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Mechanics ◽  
Axial Compression ◽  
Single Walled Carbon Nanotubes ◽  
Buckling Mode ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Buckling Behavior ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

We investigate the buckling behaviors of short multi-walled carbon nanotubes (MWCNTs) under axial compression by using molecular mechanics (MM) simulations. The effects of the number of walls, length and chiral angle of MWCNTs on the buckling behaviors are examined. The results show that the buckling behaviors of short MWCNTs are rather different from single walled carbon nanotubes (SWCNTs) and slender MWCNTs. Moreover, it is observed that the buckling strains of short MWCNTs vary inversely proportional to the number of nanotube walls. For slender MWCNTs, the buckling strains fluctuate as the number of walls increase. It increases for beam-like buckling mode, decreases for shell-like buckling mode and is approximately constant for the shell-beam-like buckling mode. The increase in the length of MWCNT has also led to a significant decrease of the buckling strain for short MWCNTs. However, chirality does not have a significant effect on the buckling strain of MWCNTs nor alter the buckling mode of short MWCNTs.

Systematic Study of Work Functions of Single-walled Carbon Nanotubes

2009 ◽  
Vol 1204 ◽  
Author(s):  
Koichiro Kato ◽  
Susumu Saito
Keyword(s):  
Carbon Nanotubes ◽  
Fermi Level ◽  
Systematic Study ◽  
Density Functional ◽  
Small Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Work Functions ◽  
Walled Carbon Nanotubes

AbstractThe work function is one of the crucial quantities in understanding their field emission properties and applying carbon nanotubes to electronic devices. We perform the systematic study of work functions of 44 kinds of isolated single-walled carbon nanotubes in the framework of the density functional theory. It has been revealed that the first-principles study plays a very important role for predicting various properties of carbon nanotubes. In general, we have to perform the structural relaxation in order to know the accurate electronic properties of carbon nanotubes. Therefore we carry out the complete geometrical relaxations for 44 kinds of carbon nanotubes and evaluate their work functions. The diameters (D) of nanotubes studied satisfy 0.3 < D < 2.0 nm. Especially, we focus on the small diameter carbon nanotubes. We determine the values of work functions from the difference between the Fermi level and the vacuum level. In the semiconducting carbon nanotubes, the Fermi level is chosen at the midgap. As a result, it is found that the carbon nanotubes should be classified into three classes according to the diameter and chiral-angle dependences of work functions.

Continuum Shell Model for Buckling of Single-Walled Carbon Nanotubes with Different Chiral Angles

2014 ◽  
Vol 14 (04) ◽  
pp. 1450006 ◽  
Author(s):  
Amar Nath Roy Chowdhury ◽  
Chien Ming Wang ◽  
Soo Jin Adrian Koh
Keyword(s):  
Carbon Nanotubes ◽  
Cylindrical Shell ◽  
Shell Model ◽  
Poisson Ratio ◽  
Single Walled Carbon Nanotubes ◽  
Md Simulations ◽  
Chiral Angle ◽  
Buckling Loads ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

In this paper, an equivalent thick cylindrical shell model is proposed for the buckling analysis of short single-walled carbon nanotubes (SWCNTs) with allowance for different chiral angles. Extensive, molecular dynamics (MD) simulations are first performed using the adaptive intermolecular reactive bond order potential to determine the critical buckling loads/strains. The MD simulations buckling results are then used as reference solutions to calibrate the properties of the thick cylindrical shell model. Central to this development is the establishment of an empirical expression for the Young's modulus that is a function of both the diameter and the chiral angle of the SWCNT. For the shell model, we have assumed that the Poisson ratio ν = 0.19 and the shell thickness h = 0.066 nm . It will be shown that the proposed shell model furnishes good estimates of the critical buckling loads for SWCNTs with different chiral angles. The critical buckling strains are also evaluated from the critical buckling load with the aid of the stress–strain relation of SWCNTs.

Effect of Vaporization Temperature on the Diameter and Chiral Angle Distributions of Single-Walled Carbon Nanotubes

2010 ◽  
Vol 10 (6) ◽  
pp. 3780-3789 ◽  
Author(s):  
Pavel Nikolaev ◽  
William Holmes ◽  
Edward Sosa ◽  
Peter Boul ◽  
Sivaram Arepalli ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Vaporization Temperature ◽  
Walled Carbon Nanotubes

Selective growth of large chiral angle single-walled carbon nanotubes

2006 ◽  
Vol 15 (4-8) ◽  
pp. 1019-1022 ◽  
Author(s):  
Matthieu Paillet ◽  
Jannik C. Meyer ◽  
Thierry Michel ◽  
Vincent Jourdain ◽  
Philippe Poncharal ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Selective Growth ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Chiral angle dependence of resonance window widths in (2n+m) families of single-walled carbon nanotubes

2010 ◽  
Vol 96 (10) ◽  
pp. 103118 ◽  
Author(s):  
Ya-Ping Hsieh ◽  
Mario Hofmann ◽  
Hootan Farhat ◽  
Eduardo B. Barros ◽  
Martin Kalbac ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Angle Dependence ◽  
Walled Carbon Nanotubes

Atomistic Study of the Strain- and Size-Dependence of Poisson’s Ratio of Single-Walled Carbon Nanotubes

2007 ◽  
Vol 121-123 ◽  
pp. 1021-1024
Author(s):  
Xian Gui Ni ◽  
Z. Zhang ◽  
Y. Wang ◽  
Xiu Xi Wang
Keyword(s):  
Carbon Nanotubes ◽  
Poisson’S Ratio ◽  
Compressive Loading ◽  
Single Walled Carbon Nanotubes ◽  
Poisson's Ratio ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Poisson's Ratios ◽  
Poisson’S Ratios

Three armchair single-walled carbon nanotubes (SWCNTs) (7, 7), (12, 12), (17, 17) and three zigzag SWCNTs (12, 0), (16, 0), (20, 0) are investigated in this paper, using the molecular dynamic (MD) method with the second-generation Tersoff-Brenner (TB) potential. The Poisson’s ratio of these nanotubes under tensile and compressive loading is obtained. The effect of the strain and size on the Poisson’s ratio of nanotubes is analyzed systematically, from the viewpoints of the structure and the averaged atomic potential energy of nanotubes. The results show that the Poisson’s ratio of nanotubes decreases as the strain increases. The Poisson’s ratios of nanotubes of larger chiral angle decrease more quickly. For nanotubes of the same chiral angle, the larger the diameters of nanotubes are, the larger their Poisson’s ratios become. Moreover, the Poisson’s ratios of nanotubes of larger diameter are more approaching.

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