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2025 Vol.35, Issue 9 Preview Page

Research Paper

High-Purification of Single-Walled Carbon Nanotubes through Chemical Oxidation Treatment and High-Temperature Chlorine Treatment

화학적 산화 처리 및 고온 염소 처리를 통한 탄소나노튜브의 고순도화

Ho Jun Moon12
,
Sumin Kim1
,
Moo-Sung Lee1†
,
Jong Hun Han1†
문 호준12
,
김 수민1
,
이 무성1†
,
한 종훈1†
1School of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
2NanoSolution Co., Ltd., Jeonju 54853, Republic of Korea
1전남대학교 화학공학부
2주식회사 나노솔루션
†Corresponding author E-Mail : moosung@jnu.ac.kr (M.-S. Lee, Chonnam Nat’l Univ.), jhhan@jnu.ac.kr (J. H. Han, Chonnam Nat’l Univ.)
27 September 2025. pp. 449-457
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Abstract

In this study, carbon nanotube (CNT) purification results were compared between the conventional wet process using strong acids and the dry process using chlorine gas at high temperatures. To evaluate the effect of catalyst support in both methods, purification experiments were conducted using Tuball SWCNT from OCSiAl (without support) and CVD CNT synthesized with supported catalysts (Fe-Mo/MgO). Before and after treatment, the CNT samples were analyzed using scanning electron microscopy (SEM), Raman spectroscopy, and thermogravimetric analysis (TGA) to compare the morphology of CNT bundles, the distribution and content of impurities, and crystallinity. The results confirm that the dry process exhibited superior characteristics for both Tuball SWCNT and CVD CNT. In particular, changes in the IG/ID ratio observed in Raman spectroscopy and the reduction of residue in TGA clearly demonstrate high crystallinity and high-purity purification without damaging the CNTs. TGA reveals a reduction in ash content from 20.2 % to 3.2 % for Tuball SWCNT and from 63.1 % to 5.4 % for CVD CNT, while Raman spectroscopy confirms the preservation of the IG/ID ratio (~50) in Tuball SWCNT and its increase from 6.86 to 9.05 in CVD CNT. The purification method proposed in this study is expected to be effectively applied in fields requiring high-purity SWCNTs, such as electronics, sensors, and energy storage devices.

Keywords
single-walled carbon nanotubes
purification
supported catalyst
crystallinity
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :9
  • Pages :449-457
  • Received Date : 2025-09-09
  • Revised Date : 2025-09-09
  • Accepted Date : 2025-09-12
  • DOI :https://doi.org/10.3740/MRSK.2025.35.9.449
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