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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.

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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