Metal catalyst-free low-temperature carbon nanotube growth on SiGe islands

2005 ◽  
Vol 86 (23) ◽  
pp. 233110 ◽  
Author(s):  
T. Uchino ◽  
K. N. Bourdakos ◽  
C. H. de Groot ◽  
P. Ashburn ◽  
M. E. Kiziroglou ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Low Temperature ◽  
Metal Catalyst ◽  
Catalyst Free ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

Computational studies of catalyst-free single walled carbon nanotube growth

2013 ◽  
Vol 139 (5) ◽  
pp. 054308 ◽  
Author(s):  
S. Haghighatpanah ◽  
A. Mohsenzadeh ◽  
H. Amara ◽  
C. Bichara ◽  
K. Bolton
Keyword(s):  
Carbon Nanotube ◽  
Computational Studies ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Catalyst Free ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

Influences of Hydrogen Gas on Carbon Nanotube Growth

2008 ◽  
Vol 1081 ◽  
Author(s):  
Fumitaka Ohashi ◽  
Guan Yow Chen ◽  
Vlad Stolojan ◽  
S. Ravi P. Silva
Keyword(s):  
Carbon Nanotube ◽  
Growth Temperature ◽  
Gas Flow ◽  
Chemical Vapour ◽  
Hydrogen Gas ◽  
Metal Catalyst ◽  
Growth Stages ◽  
Carbon Nanofibres ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

AbstractFor practical deployment of carbon nanotubes, an understanding of their growth mechanism is required in order to obtain better control over their crystallinity, chirality and other structural properties. In this study, we focus on the influences of gas species on carbon nanotube synthesis using thermal chemical vapour deposition. The influence of methane, hydrogen, and helium gases was investigated from the viewpoint of gas chemistry in relation to the nanotube structural change, by varying the growth pressure, the gas-flow ratio and the growth temperature. Simple changes in the hydrogen gas concentration during different growth stages have been found to induce surprising changes to the nanotube formation. The structure of the tubular carbon growth changed from amorphous to graphitic as the growth temperature and the concentration of hydrogen in the initial periods of growth decreases. The excess hydrogen tends to give rise to poor crystalline carbon nanofibres but has the effect of increasing the yields. Hydrogen gas is typically used in reducing metal catalyst particles during the pre-treatment and the carbon nanotube growth periods. We show that while hydrogen species can improve yield, it can also result in the degradation of the nanotube's crystallinity. The use of hydrogen in the growth process is one of the key parameters for enhanced control of carbon nanotube/nanofibre growth and their resulting crystallinity.

Correlation between metal catalyst particle size and carbon nanotube growth

2002 ◽  
Vol 355 (5-6) ◽  
pp. 497-503 ◽  
Author(s):  
E.F. Kukovitsky ◽  
S.G. L'vov ◽  
N.A. Sainov ◽  
V.A. Shustov ◽  
L.A. Chernozatonskii
Keyword(s):  
Particle Size ◽  
Carbon Nanotube ◽  
Catalyst Particle ◽  
Metal Catalyst ◽  
Catalyst Particle Size ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

scholarly journals Deployment of titanium thermal barrier for low-temperature carbon nanotube growth

2005 ◽  
Vol 87 (25) ◽  
pp. 253115 ◽  
Author(s):  
G. Y. Chen ◽  
C. H. P. Poa ◽  
S. J. Henley ◽  
V. Stolojan ◽  
S. R. P. Silva ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Low Temperature ◽  
Thermal Barrier ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth
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