scholarly journals Krypton Gas for High Quality Single Wall Carbon Nanotubes Synthesis by KrF Excimer Laser Ablation

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jasim Al-Zanganawee ◽  
Adrian Katona ◽  
Calin Moise ◽  
Dionezie Bojin ◽  
Marius Enachescu
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Excimer Laser Ablation ◽  
Laser Ablation Method ◽  
Ablation Product ◽  
Krf Excimer Laser

We report for the first time the production of single wall carbon nanotubes (SWCNTs) by KrF excimer laser ablation method under the krypton gas atmosphere. For the ablation experiment 450 mJ energy and 30 Hz repetition rate KrF excimer laser was used, and the target was prepared with the following composition: 0.6% Ni, 0.6% Co, and 98.8% C (atomic percentage). The ablation product was characterized by confocal Raman microspectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The SWCNTs obtained are a mixture of semiconducting and metallic types with narrow diameters distribution of 1.26 to 1.49 nm, are micrometers long, and contain low amount of graphite and amorphous carbon.

Synthesis of single-wall carbon nanotubes by excimer laser ablation

2014 ◽  
Vol 50 (4) ◽  
pp. 294-299 ◽  
Author(s):  
P. M. Bota ◽  
D. Dorobantu ◽  
I. Boerasu ◽  
D. Bojin ◽  
M. Enachescu
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Excimer Laser Ablation

Near-Infrared Saturable Absorption of Single-Wall Carbon Nanotubes Prepared by Laser Ablation Method

2003 ◽  
Vol 42 (Part 2, No. 5A) ◽  
pp. L494-L496 ◽  
Author(s):  
Youichi Sakakibara ◽  
Satoshi Tatsuura ◽  
Hiromichi Kataura ◽  
Madoka Tokumoto ◽  
Yohji Achiba
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Near Infrared ◽  
Single Wall Carbon Nanotubes ◽  
Saturable Absorption ◽  
Single Wall Carbon ◽  
Laser Ablation Method

Microstructure characterization of oxide coatings deposited by pulsed excimer laser ablation

2003 ◽  
Vol 18 (7) ◽  
pp. 1623-1630 ◽  
Author(s):  
M.H. Jilavi ◽  
W.M. Kriven ◽  
H. Chung ◽  
J. Mazumder
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Photoelectron Spectroscopy ◽  
Multilayer Coating ◽  
Coating Materials ◽  
Excimer Laser Ablation ◽  
Laser Ablation Method ◽  
Transmission Electron

This work addresses the issues of coating of oxide fibers or laminates with debondable oxide interphases. It fabricates a model system for an alumina matrix reinforced with alumina fibers, wherein an enstatite interphase is transformation weakened, resulting in interphase debonding. A suitable multilayer coating sequence was chosen to act as a chemical bridge between the alumina fiber and matrix. The pulsed excimer laser ablation method (KrF excimer laser of λ = 248 nm) was used to deposit several oxide materials individually onto silicon wafers. Titania (TiO2 or T), aluminum titanate (Al2O3 · TiO2,Al2TiO5 or AT), and enstatite (MgO · SiO2, MgSiO3 or EN) layers were deposited from sintered target materials. X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy investigations indicated that as-deposited coatings were amorphous or partially crystallized into nanosize grains, and their thicknesses were uniformly distributed over the Si-substrate, growing in columnar texture (although not as pronounced for enstatite). Transmission electron microscopy/energy dispersive spectroscopy analysis confirmed that the chemical composition of the coating materials was the same as that of the target materials and that the coatings were completely crystallized into nano- or submicrometer grain size after annealing at 1200 °C for 1 h. With these data, sapphire monofilaments were sequentially coated with five layers of Al2TiO5, TiO2, MgSiO3, TiO2, and Al2TiO5. This construction provided a chemical bridge between the alumina monofilament and the enstatite debondable interphase.

Luminescence and possible phase transformations in Cr-doped SrTiO3and Sr0.998Ca0.002TiO3thin films deposited by the excimer laser ablation method

1996 ◽  
Vol 184 (1) ◽  
pp. 41-49 ◽  
Author(s):  
V. Trepakov ◽  
V. Vikhnin ◽  
T. Shaplygina ◽  
Z. Bryknar ◽  
Z. Potůček ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Phase Transformations ◽  
Excimer Laser ◽  
Excimer Laser Ablation ◽  
Laser Ablation Method
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