scholarly journals Inherent predominance of high chiral angle metallic carbon nanotubes in continuous fibers grown from a molten catalyst

Nanoscale ◽  
2016 ◽  
Vol 8 (7) ◽  
pp. 4236-4244 ◽  
Author(s):  
B. Alemán ◽  
M. Mar Bernal ◽  
B. Mas ◽  
Emilio M. Pérez ◽  
V. Reguero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Angle Distribution ◽  
Molten State ◽  
Chiral Angle ◽  
Alloy Catalyst

The armchair-biased chiral angle distribution in continuous fibres of CNTs is controlled by the molten state of the Fe–S–C alloy catalyst.

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

Atomically Resolved STM Images of CVD Grown Carbon Nanotubes

2004 ◽  
Vol 838 ◽  
Author(s):  
Daniel Chiang ◽  
Philip Zifeng Lei ◽  
Lifeng Dong ◽  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor ◽  
Bimodal Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Scanning Tunneling ◽  
Ambient Conditions ◽  
Chiral Angle ◽  
Index Pairs ◽  
Zero Degree ◽  
Stm Images

ABSTRACTAtomically resolved images of single-wall carbon nanotubes (CNT) grown in a chemical vapor deposition (CVD) chamber were obtained with the scanning tunneling microscope (STM) under ambient conditions. We found that the average diametersdof the CVD-grown CNTs appear to fall into a bimodal distribution of 1.0 and 0.6 nm, and the chiral angle Ø was observed to be close to zero degree. The summation of the lattice indices(n+m)was determined to be 14 and 9 ford=1.0nm andd=0.6nm, respectively. The most possible lattice index pairs(n, m)with a chiral angle close to zero degree are(7, 7)and(5, 4), which indicates that the larger nanotubes are metallic and the smaller nanotubes are semi-conductive.

Highly active reduction of oxygen on a FeCo alloy catalyst encapsulated in pod-like carbon nanotubes with fewer walls

2013 ◽  
Vol 1 (47) ◽  
pp. 14868 ◽  
Author(s):  
Jiao Deng ◽  
Liang Yu ◽  
Dehui Deng ◽  
Xiaoqi Chen ◽  
Fan Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Feco Alloy ◽  
Highly Active ◽  
Alloy Catalyst

scholarly journals Chirality Distributions for Semiconducting Single-Walled Carbon Nanotubes Determined by Photoluminescence Spectroscopy

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2309
Author(s):  
Masaru Irita ◽  
Takahiro Yamamoto ◽  
Yoshikazu Homma
Keyword(s):  
Evaluation Method ◽  
Growth Yield ◽  
Photoluminescence Spectroscopy ◽  
Dislocation Model ◽  
Angle Distribution ◽  
Chiral Angle ◽  
Patterned Substrate ◽  
Single Walled Carbon ◽  
Theoretical Predictions ◽  
Walled Carbon Nanotubes

To realize single-walled carbon nanotube (SWCNT) chiral selective growth, elucidating the mechanism of SWCNT chirality (n,m) selectivity is important. For this purpose, an accurate evaluation method for evaluating the chirality distribution of grown SWCNTs without post-growth processing or liquid-dispersion of SWCNTs is indispensable. Here, we used photoluminescence spectroscopy to directly measure the chirality distributions of individual semiconducting SWCNTs suspended on a pillar-patterned substrate. The number of chirality-assigned SWCNTs was up to 332 and 17 chirality types with the chiral angles ranging from 0° to 28.05° were detected. The growth yield of SWCNTs was confirmed to primarily depends on the chiral angle in accordance with the screw dislocation model. Furthermore, when higher-yield chiralities are selected, the chiral angle distribution with a peak corresponding to near-armchair SWCNTs is well fitted with a model that incorporates the thermodynamic effect at the SWCNT-catalyst interface into the kink growth-based kinetic model. Our quantitative and statistical data provide new insights into SWCNT growth mechanism as well as experimental confirmation of theoretical predictions.

A highly active and durable iron/cobalt alloy catalyst encapsulated in N-doped graphitic carbon nanotubes for oxygen reduction reaction by a nanofibrous dicyandiamide template

2018 ◽  
Vol 6 (14) ◽  
pp. 5962-5970 ◽  
Author(s):  
Li An ◽  
Ning Jiang ◽  
Biao Li ◽  
Shixin Hua ◽  
Yutong Fu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Graphitic Carbon ◽  
Cobalt Alloy ◽  
Iron Cobalt ◽  
Highly Active ◽  
Alloy Catalyst

The FeCo@N-GCNT-FD catalyst exhibits enhanced intrinsic activities and excellent durability for the oxygen reduction reaction.

Preparation of novel RuB amorphous alloy catalyst supported on carbon nanotubes

Carbon ◽  
2005 ◽  
Vol 43 (4) ◽  
pp. 861-864 ◽  
Author(s):  
Shengxian Xu ◽  
Fengyi Li ◽  
Renzhong Wei
Keyword(s):  
Carbon Nanotubes ◽  
Amorphous Alloy ◽  
Alloy Catalyst

CVD growth of carbon nanotubes on thin-film Ni20Ti35N45 alloy catalyst

2015 ◽  
Vol 41 (12) ◽  
pp. 1177-1180 ◽  
Author(s):  
D. G. Gromov ◽  
A. A. Pavlov ◽  
S. N. Skorik ◽  
A. Yu. Trifonov ◽  
A. S. Shulyat’ev
Keyword(s):  
Thin Film ◽  
Carbon Nanotubes ◽  
Cvd Growth ◽  
Alloy Catalyst

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.

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