The Control on Morphology and Crystallinity of CNT in Flame Synthesis with One-Dimensional Reaction Zone

Submitting author affiliation:
HiREF Laboratory, FKM, UTM, Skudai, Malaysia

Beilstein Arch. 2023, 20235.

Published 20 Jan 2023

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The growth of carbon nanotubes (CNT) in flame requires imperative conditions that are difficult to achieve in a highly heterogeneous environment. Therefore, the analysis of the properties of the reaction zone within the flame is critical for the optimal growth of CNT.  In the present study, a comprehensive comparison between the CNT synthesis using methane diffusion flame and that of premixed flame is conducted regarding the morphology and crystallinity of the as-grown nanotubes. The premixed burner configuration created a flame that isstabilized across axisymmetric stagnation flow through sintered metal, making the flame one-dimensional in nature as opposed to the co-flow configuration of diffusion flame. The significant difference in temperature distribution between the two flames causes the difference in the characteristic pattern of the growth products. In diffusion flame, the growth is limited to specific regions at certain height-above-burners (HAB) with suitable thermochemical conditions. The identified growth regions at different HAB showed similar temperature distribution that produces CNT of similar characteristics. In contrast with premixed flame, the growth of CNT dictates by only the HAB due to relatively uniform temperature distribution along the radial directions but significantly different in the vertical direction.

Keywords: Carbon nanotubes; flame synthesis; one-dimensional flame; morphology; crystallinity; synthesis control

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Ibrahim, M. H.; Hamzah, N.; Mohd Yasin, M. F.; Mohd Yusop, M. Z.; Septiani, N. L. W. Beilstein Arch. 2023, 20235. doi:10.3762/bxiv.2023.5.v1

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