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High-density aligned carbon nanotubes with uniform diameters

Published online by Cambridge University Press:  31 January 2011

P. J. Cao,
Y. S. Gu,
H. W. Liu,
F. Shen,
Y. G. Wang,
Q. F. Zhang,
J. L. Wu and
H. J. Gao
P. J. Cao
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Y. S. Gu
Affiliation:
Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
H. W. Liu
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
F. Shen
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Y. G. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Q. F. Zhang
Affiliation:
Department of Electronics, Peking University, Beijing 100871, People's Republic of China
J. L. Wu
Affiliation:
Department of Electronics, Peking University, Beijing 100871, People's Republic of China
H. J. Gao
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

A new method was found to synthesize large-area (7 × 15 mm2), high-density (higher than 109 cm−2), aligned carbon nanotubes (CNTs) with uniform diameters on a silica wafer. Ferrocene/melamine mixtures were pyrolyzed through a three-step process in an Ar atmosphere in a single-stage furnace. The structure and composition of the CNTs were investigated by scanning electron microscopy, transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), and electron energy-loss spectroscopy (EELS). It was found that these nanotubes have uniform outer diameters of about 22 nm and varying lengths from 10 to 40 μm. High-resolution TEM images showed that CNT is composed of graphite-like layers arranged in a stacked-cup-like structure. XPS results showed that the layer covering the tops of the aligned CNTs consists of carbon and iron. The EELS spectrum showed that these tubes are pure carbon.

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Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003, pp. 1686 - 1690
Copyright
Copyright © Materials Research Society 2003

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