Characteristics of optical emissions of arc plasma processing for high-rate synthesis of highly crystalline single-walled carbon nanotubes

Single-walled carbon nanotubes (SWNTs) were synthesized with a high growth rate using an arc plasma employing carbon electrodes with a Ni-Y mixture catalyst. However, the mechanism of growth of highly crystalline SWNTs has not been clarified. Reactions between carbon and catalyst are considered to b...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2017-03, Vol.56 (3), p.35101-035101
Main Authors: Ando, Atsushi, Takeda, Keigo, Ohta, Takayuki, Ito, Masafumi, Hiramatsu, Mineo, Ishikawa, Kenji, Kondo, Hiroki, Sekine, Makoto, Suzuki, Tomoko, Inoue, Sakae, Ando, Yoshinori, Hori, Masaru
Format: Article
Language:English
Subjects:
Carbon
Catalysts
Crystal structure
Crystallinity
Electrodes
Emission
Single wall carbon nanotubes
Synthesis
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Summary:Single-walled carbon nanotubes (SWNTs) were synthesized with a high growth rate using an arc plasma employing carbon electrodes with a Ni-Y mixture catalyst. However, the mechanism of growth of highly crystalline SWNTs has not been clarified. Reactions between carbon and catalyst are considered to be one of the crucial factors in SWNT growth. Optical emission spectroscopy (OES) provides the information about the species in the plasma. C2, Ni, and Y emissions in the arc plasma at different currents were measured to investigate the relationship between active species in the arc plasma and the SWNT synthesis. On the basis of OES results, it was found that the balance between catalytic metal atoms and C2 radical emissions indicated the crystallinity ratio of SWNTs in thin graphitic or amorphous carbon layers. These results are useful for controlling the growth of SWNTs employing arc plasmas.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.56.035101