Single-walled carbon nanotubes produced by cw CO 2 -laser ablation: study of parameters important for their formation

2000 ◽  
Vol 70 (2) ◽  
pp. 145-151 ◽  
Author(s):  
E. Muñoz ◽  
W.K. Maser ◽  
A.M. Benito ◽  
M.T. Martínez ◽  
G.F. de la Fuente ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Ablation Study ◽  
Walled Carbon Nanotubes

Aligned Arrays of Single-Walled Carbon Nanotubes Generated from Random Networks by Orientationally Selective Laser Ablation

Nano Letters ◽  
2004 ◽  
Vol 4 (12) ◽  
pp. 2421-2426 ◽  
Author(s):  
Coskun Kocabas ◽  
Matthew A. Meitl ◽  
Anshu Gaur ◽  
Moonsub Shim ◽  
J. A. Rogers
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Single Walled Carbon Nanotubes ◽  
Random Networks ◽  
Single Walled Carbon ◽  
Aligned Arrays ◽  
Walled Carbon Nanotubes

Isosteric Heat of Argon Adsorbed on Single-Walled Carbon Nanotubes Prepared by Laser Ablation

2005 ◽  
Vol 109 (19) ◽  
pp. 9317-9320 ◽  
Author(s):  
Vaiva Krungleviciute ◽  
Luke Heroux ◽  
Aldo D. Migone ◽  
Christopher T. Kingston ◽  
Benoit Simard
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Single Walled Carbon Nanotubes ◽  
Isosteric Heat ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Gas and pressure effects on the production of single-walled carbon nanotubes by laser ablation

Carbon ◽  
2000 ◽  
Vol 38 (10) ◽  
pp. 1445-1451 ◽  
Author(s):  
E Muñoz ◽  
W.K Maser ◽  
A.M Benito ◽  
M.T Martı́nez ◽  
G.F de la Fuente ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Single Walled Carbon Nanotubes ◽  
Pressure Effects ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Twisting of Single-Walled Carbon Nanotube Bundles

1999 ◽  
Vol 593 ◽  
Author(s):  
Lu-Chang Qin ◽  
Sumio Iijima
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Laser Ablation ◽  
Total Energy ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Nanotube Bundles ◽  
Lower Total Energy ◽  
Walled Carbon Nanotubes

ABSTRACTBundles of single-walled carbon nanotubes produced by laser ablation are often seen twisted in morphology, forming nanoropes which would better suit the function for improvement of structural stability in mechanical applications. The rope-like configuration is explained with a model that relates the twisting morphology to the helicity difference between the neighboring nanotubes. This selfassembly phenomenon is attributed to the fact that a twisted structure has lower total energy compared with the raft-like parallel bundles when the helicities of neighboring nanotubes are different.

Effect of Temperature Gradient near the Target and Gas Flow Rate on the Diameter Distribution of Single-Walled Carbon Nanotubes Grown by the Laser Ablation Technique

2000 ◽  
Vol 633 ◽  
Author(s):  
Rahul Sen ◽  
Hiromichi Kataura ◽  
Yohsuke Ohtsuka ◽  
Toshinobu Ishigaki ◽  
Shinzo Suzuki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Temperature Gradient ◽  
Flow Rate ◽  
Gas Flow ◽  
Single Walled Carbon Nanotubes ◽  
Diameter Distribution ◽  
Gas Flow Rate ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

AbstractGas dynamic and time resolved imaging studies have been performed on the growth of single-walled carbon nanotubes (SWNTs) in the laser ablation process. SWNTs were synthesized by laser ablation of Ni-Co catalyzed graphite targets at 1200°C under argon flow. The effects of the temperature gradient near the target and the gas flow rate were studied in order to understand the effect of gas dynamics over the diameter distribution of SWNTs. The gas flow rate affects the diameter distribution of SWNTs especially when the growth species flow through a large temperature gradient. Scattering images from the growth species at different flow rates was recorded by high-speed video imaging. The results indicate that the velocities of these species are dependent on the gas flow rate but this dependence is evident 30 ms after the laser ablation. These findings are used to estimate the time period for the nucleation and the growth of SWNTs.

Single-Walled Carbon Nanotubes Synthesis: A Direct Comparison of Laser Ablation and Carbon Arc Routes

2008 ◽  
Vol 8 (11) ◽  
pp. 6178-6186 ◽  
Author(s):  
M. Bystrzejewski ◽  
M. H. Rümmeli ◽  
H. Lange ◽  
A. Huczko ◽  
P. Baranowski ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Arc Discharge ◽  
Relative Yield ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Carbon Rods ◽  
Carbon Arc ◽  
Synthesis Routes ◽  
Walled Carbon Nanotubes

Carbon arc and chemical vapor deposition are at present the most efficient methods for mass production of single-walled carbon nanotubes. However, laser ablation is renowned for high quality nanotubes with narrow diameter distributions and hence is also of great interest. The aim of this work was to compare both the carbon arc and laser ablation techniques with respect to the quality and relative yield of the produced SWCNTs. For this comparative study we used Fe as the catalyst, which is known not to be very active in laser ablation. However, we show this is not the case when H2 is included in the reaction. The reactions for both synthesis routes were carried out in a N2–H2 (95–5% vol.) atmosphere. The same homogenous carbon rods with different iron contents, between 1 and 5 at.% were used as the carbon feedstock and catalyst supply in both synthesis routes. Additionally, two types of carbon rods containing 1 at.% Fe with different graphitization degrees were also investigated. In the arc-discharge case, the low-graphitized electrode produced a web-like product rich in SWCNTs, while the high-graphitized carbon rods yielded soot containing carbon-encapsulated iron nanocrystallites, amorphous carbon nanoparticles, and surprisingly a small fraction of SWCNTs. With laser ablation synthesis, the Fe content and the reactor temperature significantly influenced the SWCNTs yield. Carbon arc plasma diagnostics were also performed. By using optical emission and Absorption spectroscopy the plasma temperature, C2 and CN radical content in the arc zone were determined.

Single-walled carbon nanotubes produced by laser ablation under different inert atmospheres

1999 ◽  
Vol 103 (1-3) ◽  
pp. 2490-2491 ◽  
Author(s):  
E. Muñoz ◽  
W.K. Maser ◽  
A.M. Benito ◽  
G.F. de la Fuente ◽  
M.T. Martínez
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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