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Title: “Synthesis-on” and “synthesis-off” modes of carbon arc operation during synthesis of carbon nanotubes

Arc discharge synthesis of single-walled carbon nanotubes (SWCNTs) remains largely uncontrollable, due to incomplete understanding of the synthetic process itself. Here, we show that synthesis of SWCNTs by a carbon arc may not constitute a single continuous process, but may instead consist of two distinct modes. One of these, a “synthesis-on” mode, produces the majority of the nanomaterials. During the synthesis-on mode, proportionally more carbon nanotubes are collected than in another mode, a “synthesis-off” mode. Both synthesis-on and synthesis-off modes for a typical arc configuration, employing a hollow anode filled with a mixture of powdered metal catalyst and graphite, were characterized by using in situ electrical, imaging, and spectroscopic diagnostics, along with ex situ imaging and spectroscopy. The synthesis-on mode duration is rare compared to the total arc run-time, helping to explain the poor selectivity found in the final collected products, a known inadequacy of arc synthesis. Finally, the rarity of the synthesis on mode occurence may be due to the synthesis off mode being more favorable energetically.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [2] ;  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Princeton Univ., NJ (United States). Dept. of Chemical and Biological Engineering
Publication Date:
Grant/Contract Number:
AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 125; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1411592

Yatom, Shurik, Selinsky, Rachel S., Koel, Bruce E., and Raitses, Yevgeny. “Synthesis-on” and “synthesis-off” modes of carbon arc operation during synthesis of carbon nanotubes. United States: N. p., Web. doi:10.1016/j.carbon.2017.09.034.
Yatom, Shurik, Selinsky, Rachel S., Koel, Bruce E., & Raitses, Yevgeny. “Synthesis-on” and “synthesis-off” modes of carbon arc operation during synthesis of carbon nanotubes. United States. doi:10.1016/j.carbon.2017.09.034.
Yatom, Shurik, Selinsky, Rachel S., Koel, Bruce E., and Raitses, Yevgeny. 2017. "“Synthesis-on” and “synthesis-off” modes of carbon arc operation during synthesis of carbon nanotubes". United States. doi:10.1016/j.carbon.2017.09.034. https://www.osti.gov/servlets/purl/1411592.
@article{osti_1411592,
title = {“Synthesis-on” and “synthesis-off” modes of carbon arc operation during synthesis of carbon nanotubes},
author = {Yatom, Shurik and Selinsky, Rachel S. and Koel, Bruce E. and Raitses, Yevgeny},
abstractNote = {Arc discharge synthesis of single-walled carbon nanotubes (SWCNTs) remains largely uncontrollable, due to incomplete understanding of the synthetic process itself. Here, we show that synthesis of SWCNTs by a carbon arc may not constitute a single continuous process, but may instead consist of two distinct modes. One of these, a “synthesis-on” mode, produces the majority of the nanomaterials. During the synthesis-on mode, proportionally more carbon nanotubes are collected than in another mode, a “synthesis-off” mode. Both synthesis-on and synthesis-off modes for a typical arc configuration, employing a hollow anode filled with a mixture of powdered metal catalyst and graphite, were characterized by using in situ electrical, imaging, and spectroscopic diagnostics, along with ex situ imaging and spectroscopy. The synthesis-on mode duration is rare compared to the total arc run-time, helping to explain the poor selectivity found in the final collected products, a known inadequacy of arc synthesis. Finally, the rarity of the synthesis on mode occurence may be due to the synthesis off mode being more favorable energetically.},
doi = {10.1016/j.carbon.2017.09.034},
journal = {Carbon},
number = C,
volume = 125,
place = {United States},
year = {2017},
month = {9}
}