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Nanomaterials 2015, 5(3), 1200-1210; doi:10.3390/nano5031200

The Application of Gas Dwell Time Control for Rapid Single Wall Carbon Nanotube Forest Synthesis to Acetylene Feedstock

National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Academic Editor: Stephen Ralph
Received: 17 April 2015 / Revised: 13 July 2015 / Accepted: 14 July 2015 / Published: 17 July 2015
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Abstract

One aspect of carbon nanotube (CNT) synthesis that remains an obstacle to realize industrial mass production is the growth efficiency. Many approaches have been reported to improve the efficiency, either by lengthening the catalyst lifetime or by increasing the growth rate. We investigated the applicability of dwell time and carbon flux control to optimize yield, growth rate, and catalyst lifetime of water-assisted chemical vapor deposition of single-walled carbon nanotube (SWCNT) forests using acetylene as a carbon feedstock. Our results show that although acetylene is a precursor to CNT synthesis and possesses a high reactivity, the SWCNT forest growth efficiency is highly sensitive to dwell time and carbon flux similar to ethylene. Through a systematic study spanning a wide range of dwell time and carbon flux levels, the relationship of the height, growth rate, and catalyst lifetime is found. Further, for the optimum conditions for 10 min growth, SWCNT forests with ~2500 μm height, ~350 μm/min initial growth rates and extended lifetimes could be achieved by increasing the dwell time to ~5 s, demonstrating the generality of dwell time control to highly reactive gases. View Full-Text
Keywords: single-walled carbon nanotubes; water-assisted chemical vapor deposition; carbon flux; dwell time; acetylene single-walled carbon nanotubes; water-assisted chemical vapor deposition; carbon flux; dwell time; acetylene
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Matsumoto, N.; Oshima, A.; Sakurai, S.; Yamada, T.; Yumura, M.; Hata, K.; Futaba, D.N. The Application of Gas Dwell Time Control for Rapid Single Wall Carbon Nanotube Forest Synthesis to Acetylene Feedstock. Nanomaterials 2015, 5, 1200-1210.

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