TY - JOUR
T1 - Low-temperature growth and field emission of aligned carbon nanotubes by chemical vapor deposition
AU - Shyu, Yih Ming
AU - Hong, Franklin Chau Nan
N1 - Funding Information:
Financial support for this work from the National Science Council, Taiwan, under Contract No. NSC-89-2214-E-006-018 is gratefully acknowledged. The authors would like to acknowledge Prof. K.H. Chen, Mr. Y.C. Cheng, and Mr. S.J. Jen at Institute of Atomic and Molecular Sciences, Academia Sinica for assistance in field emission measurements. The authors also appreciate helpful discussion with Dr. J.J. Wu at National Cheng-Kung University on the field emission results.
PY - 2001/11/1
Y1 - 2001/11/1
N2 - Carbon nanotubes have been grown on silicon substrates coated with metal catalysts containing Ni and Fe at low temperatures by chemical vapor deposition using mixtures of acetylene and nitrogen at 90 Torr. At a growth temperature of 400°C, all nanotubes are well aligned. However, these nanotubes are not made of perfect graphite as characterized by transmission electron microscopy and Raman spectra. The amount of carbon soot in the film increases apparently with increase of the concentration of acetylene and the growth temperature. But, as the growth temperature is raised to 500 or 600°C, the graphitic-sheets begin to appear in the tube shell although the alignment of nanotubes becomes worse due to various growth rates for different sizes of nanotubes. Methane and carbon monoxide reactants are studied and found to be unable to grow carbon nanotubes at the conditions employed for acetylene to successfully grow nanotubes. Field emission of the carbon nanotube film grown at 400°C is also measured. The turn on voltage is 11 V μm-1.
AB - Carbon nanotubes have been grown on silicon substrates coated with metal catalysts containing Ni and Fe at low temperatures by chemical vapor deposition using mixtures of acetylene and nitrogen at 90 Torr. At a growth temperature of 400°C, all nanotubes are well aligned. However, these nanotubes are not made of perfect graphite as characterized by transmission electron microscopy and Raman spectra. The amount of carbon soot in the film increases apparently with increase of the concentration of acetylene and the growth temperature. But, as the growth temperature is raised to 500 or 600°C, the graphitic-sheets begin to appear in the tube shell although the alignment of nanotubes becomes worse due to various growth rates for different sizes of nanotubes. Methane and carbon monoxide reactants are studied and found to be unable to grow carbon nanotubes at the conditions employed for acetylene to successfully grow nanotubes. Field emission of the carbon nanotube film grown at 400°C is also measured. The turn on voltage is 11 V μm-1.
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U2 - 10.1016/S0254-0584(01)00441-2
DO - 10.1016/S0254-0584(01)00441-2
M3 - Article
AN - SCOPUS:0035501112
SN - 0254-0584
VL - 72
SP - 223
EP - 227
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 2
ER -