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Plasma-enhanced chemical vapor deposition of carbon nanotubes using alcohol vapor

Published online by Cambridge University Press:  01 February 2011

Atsushi Okita ,
Yoshiyuki Suda ,
Masayuki Maekawa ,
Junichi Takayama ,
Akinori Oda ,
Hirotake Sugawara  and
Yosuke Sakai
Atsushi Okita
Affiliation:
[email protected], Hokkaido Univ., Laboratory of Integrated Material Processings, Graduate School of Information Science and Technology, N14 W9, Kita-ku, Sapporo, 060-0814, Japan, +81-11-706-6519, +81-11-706-6482
Yoshiyuki Suda
Affiliation:
[email protected], Hokkaido Univ., Laboratory of Integrated Material Processings, Graduate School of Information Science and Technology, N14 W9, Kita-ku, Sapporo, 060-0814, Japan
Masayuki Maekawa
Affiliation:
[email protected], Hokkaido Univ., Laboratory of Integrated Material Processings, Graduate School of Information Science and Technology, N14 W9, Kita-ku, Sapporo, 060-0814, Japan
Junichi Takayama
Affiliation:
[email protected], Hokkaido Univ., Laboratory of Integrated Material Processings, Graduate School of Information Science and Technology, N14 W9, Kita-ku, Sapporo, 060-0814, Japan
Akinori Oda
Affiliation:
[email protected], Nagoya Institute of Technology, Graduate School of Engineering, Gokiso-cho, Showa-ku,, Nagoya, 466-8555, Japan
Hirotake Sugawara
Affiliation:
[email protected], Hokkaido Univ., Laboratory of Integrated Material Processings, Graduate School of Information Science and Technology, N14 W9, Kita-ku, Sapporo, 060-0814, Japan
Yosuke Sakai
Affiliation:
[email protected], Hokkaido Univ., Laboratory of Integrated Material Processings, Graduate School of Information Science and Technology, N14 W9, Kita-ku, Sapporo, 060-0814, Japan
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Abstract

We have successfully grown carbon nanotubes (CNTs) by alcohol plasma-enhanced chemical vapor deposition (PECVD). When 0.01 wt% ferrocene was added to alcohol, vertically-aligned CNTs could be grown using RF (= 13.56 MHz) plasma at 650°C. In contrast, no CNTs were obtained by pure alcohol PECVD. To understand the plasma properties for CNT growth, especially plasma species containing a gas phase of alcohol plasma, we analyzed the plasma using optical emission spectroscopy (OES) and quadrupole mass spectrometry (QMS). From the OES measurement, one could identify the emission peaks from the excitation states of CHO, CO, C2, O2, H, CH+, and H2O+, while the QMS measurement also showed the existence of CO, H2O, and CxHy (x≥2, y≥2). It is considered that such plasma species affect CNT growth by changing the oxidation state of the catalyst or by adjusting the amount of precursor species in the plasma. Comparing this PECVD experiment with thermal alcohol CVD (without plasma), only PECVD can be used to grow CNTs under the reported experimental conditions. It is considered that thermal alcohol CVD requires more energy to grow CNTs because 650°C is a little lower than the temperature required for CNT growth. These results indicate that in alcohol plasma, the active species produced by decomposition and recombination reactions have a possibility to promote/suppress CNT growth depending on the process conditions.

Keywords

plasma-enhanced CVD (PECVD) (deposition)nanostructureplasma-enhanced CVD (PECVD) (chemical reaction)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1057: Symposium II – Nanotubes and Related Nanostructures , 2007 , 1057-II05-10
Copyright
Copyright © Materials Research Society 2008

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References

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