An Effect of Gas-Phase Reactions on the Vertically Aligned CNT Growth by Temperature Gradient Chemical Vapor Deposition
SCIE
SCOPUS
- Title
- An Effect of Gas-Phase Reactions on the Vertically Aligned CNT Growth by Temperature Gradient Chemical Vapor Deposition
- Authors
- Yang, Ning; Youn, Seul Ki; Frouzakis, Christos; PARK, HYUNG GYU
- Date Issued
- 2018-04
- Publisher
- Pergamon Press Ltd.
- Abstract
- Gas-phase reactions among carbon precursors could have a significant effect on the catalytic synthesis of vertically aligned (VA-) carbon nanotubes (CNTs). State-of-the-art adjustment of the gas-phase reaction conditions is done ad hoc with low reproducibility, ascribed partly to an incomplete understanding of the mechanism how the gas-phase reaction influences the growth kinetics of VA-CNTs. Here, we investigate this mechanism and propose that in the presence of prominent gas-phase reaction, the growth kinetics characterization shifts from a single rate-limiting reaction to a multi-route reaction with each pathway having its own rate-limiting step. The rate of the gas-phase reaction could be tailored by the partial pressure and thermal history of a carbon feedstock (e.g., acetylene). According to in-situ mass spectrometry and numerical simulation, a rich set of thermally rearranged secondary species (e.g., C4H4 and C6H6) are found above the catalyst surface. It appears that these secondary species, along with a chief precursor (C2H2), can give variation to a yield of CNTs through various reaction pathways with altering the overall growth rate of VA-CNTs. Our findings would further the current understanding of the VA-CNT growth from thermally rearranged precursors, instrumental to applications such as diameter-controlled growth and CMOS-compatible low-temperature growth. (c) 2018 Elsevier Ltd. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/98786
- DOI
- 10.1016/j.carbon.2018.01.072
- ISSN
- 0008-6223
- Article Type
- Article
- Citation
- Carbon, vol. 130, page. 607 - 613, 2018-04
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