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Cited by 165Carbon Nanotubes in CompositesGraphene research and applicationsSupercapacitor Materials and Fabrication

The DOI matches its Crossref record; 41 of the 41 references it cites were found in a registry or an index.

Purification of Single-Wall Carbon Nanotubes by Electrochemical Oxidation

Fang, Hai-Tao, Liu, Chen-Guang, Liu, Chang, Li, Feng, Liu, Min, Cheng, Hui-Ming·2004·Chemistry of Materials
DOI 10.1021/cm035263h
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Abstract

The electrochemical cyclic voltammetric (CV) oxidation behavior of an arc-derived single-wall carbon nanotube (SWNT) sample in potassium hydroxide solution was investigated. Amorphous carbon in the as-grown SWNT sample was effectively removed by the CV oxidation, as confirmed by analyzing the sp 3 /sp 2 carbon ratio from C1s XPS spectra and HRTEM observations. The removal of the amorphous carbon led to the exposure of metal nanoparticles, hence facilitating the elimination of the metal impurities by subsequent HCl washing. The CV oxidation can be applied as an alternative oxidative treatment for the purification of SWNT samples. Redox peaks were observed during the CV oxidation. The reduction peaks in the range of −0.96 to −1.0 V and the oxidation peaks in the range of −0.61 to −0.49 V were attributed to the electrochemical redox transformations between metallic Fe and Fe(II) oxide, Fe(II) oxide and Fe(III) oxide, as well as Ni and Ni(II) oxide, and the observed reduction peaks in the potential range of 0.29−0.13 V were believed to be caused by the electrochemical reduction of NiOOH into Ni(OH) 2 . The intensity of all of the redox peaks was dependent on the cycle number because more and more metal nanoparticles could be exposed as a result of the incremental removal or damage of the amorphous carbon coating during the CV oxidation, while the intensity remained almost unchanged after 80 cycles because of the completion of the amorphous carbon removal. Therefore, the redox peaks from the electrochemical redox reactions of Fe and Ni impurities can be considered as a benchmark for the removal extent of the amorphous carbon, and optimal electrochemical oxidation time for the purification of the as-grown SWNT sample can be determined in real time during the CV oxidation treatment. This is a predominant advantage of the CV oxidation over common oxidation methods using air or other oxidizing reagents for SWNT purification.

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Research works printed but not linked: 2

  1. Yang Z. H., 2001, Chem. J. Chin. Univ., 22, 446
  2. Kinoshita, K. Carbon : e lectrochemcial and physicochemical properties ; Wiley: New York, 1987; p 334.

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Metadata

Authors
Fang, H.-T., Liu, C.-G., Liu, C., Li, F., Liu, M., & Cheng, H.-M.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
Cheng, Hui-Ming
ORCID
Venue
Chemistry of Materials
Publisher
American Chemical Society (ACS)
Published
2004-11-17
Volume
16
Issue
26
Pages
5744-5750
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
DOI
10.1021/cm035263h
OpenAlex
W2059361550
Cited by
165
References
41
Citations by year
2026: 5 · 2025: 7 · 2024: 2 · 2023: 6 · 2022: 3 · 2021: 2 · 2020: 6 · 2019: 6 · 2018: 5 · 2017: 12 · 2016: 9 · 2015: 4 · 2014: 11 · 2013: 11 · 2012: 6
FWCI
5.62
Type
journal article
Language
en
Open access
closed
Locations
Chemistry of Materials (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Carbon Nanotubes in Composites
  • Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Supercapacitor Materials and Fabrication
Keywords
single-walled carbon nanotubes, electrochemical oxidation, cyclic voltammetry, nanotube purification, amorphous carbon removal, metal impurity removal, iron oxide, nickel oxide, sp3/sp2 carbon ratio, potassium hydroxide solution

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