This article reports a possible functionalization mechanism of isocyanate (NCO) groups on multiwalled carbon nanotubes (CNTs) with low-temperature plasma. The mechanism was clarified according to the analysis with two plasmas generated with the gas mixture of (1) nitrogen and carbon dioxide and (2) nitrogen and oxygen. We analyzed the mechanism through optical emission spectroscopy from these plasmas and the NCO functionalization ratio measured with the fluorescent method after plasma exposure over CNTs. The optical emission gave us information on the quantitative analysis of the gas species of atomic nitrogen (N), atomic oxygen (O), and carbon monoxide (CO) and the qualitative analysis of carbon nitride (CN) species in the plasma. Compared with our results from the gas species in the plasma and the NCO functionalization ratio on CNTs, CO and CN species in the gas phase in plasma are less likely to contribute to forming NCO groups on CNTs. Rather, the equal densities of atomic nitrogen and oxygen species in the plasma could be effective in forming NCO groups on the CNT surface: the NCO groups should form by N, O, and carbon (C) species on the CNT surface. The groups likely build up gradually by N, O, and C individually reaching a CNT surface, or the NCO radicals form in the gas phase and then attach to the CNT surface.
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November 2023
Research Article|
September 15 2023
Plasma functionalization mechanism to modify isocyanate groups on multiwalled carbon nanotubes
Daisuke Ogawa
;
Daisuke Ogawa
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Supervision, Writing – original draft)
Department of Electrical and Electronic Engineering, Chubu University
, 1200 Matsumoto-cho, Kasugai-shi, Aichi-ken 487-8501, Japan
a)Author to whom correspondence should be addressed: d_ogawa@isc.chubu.ac.jp
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Keiji Nakamura
Keiji Nakamura
(Data curation, Formal analysis, Project administration, Resources)
Department of Electrical and Electronic Engineering, Chubu University
, 1200 Matsumoto-cho, Kasugai-shi, Aichi-ken 487-8501, Japan
Search for other works by this author on:
a)Author to whom correspondence should be addressed: d_ogawa@isc.chubu.ac.jp
J. Vac. Sci. Technol. A 41, 063001 (2023)
Article history
Received:
May 16 2023
Accepted:
August 21 2023
Citation
Daisuke Ogawa, Keiji Nakamura; Plasma functionalization mechanism to modify isocyanate groups on multiwalled carbon nanotubes. J. Vac. Sci. Technol. A 1 November 2023; 41 (6): 063001. https://doi.org/10.1116/6.0002835
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