Surface modification of multiwall carbon nanotubes by electrochemical anodic oxidation

ZHANG Wei-song; LIU Yu-ting; WU Gang-ping

doi:10.1016/S1872-5805(20)60481-4

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ZHANG Wei-song, LIU Yu-ting, WU Gang-ping. Surface modification of multiwall carbon nanotubes by electrochemical anodic oxidation. New Carbon Mater., 2020, 35(2): 155-164. doi: 10.1016/S1872-5805(20)60481-4

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ZHANG Wei-song, LIU Yu-ting, WU Gang-ping. Surface modification of multiwall carbon nanotubes by electrochemical anodic oxidation. New Carbon Mater., 2020, 35(2): 155-164. doi: 10.1016/S1872-5805(20)60481-4

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Surface modification of multiwall carbon nanotubes by electrochemical anodic oxidation

doi: 10.1016/S1872-5805(20)60481-4

ZHANG Wei-song^1,2,3,
LIU Yu-ting^1,3,
WU Gang-ping^{1,2,3
,}

1.
CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3.
National Engineering Laboratory for Carbon Fiber Preparation, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Funds: National Natural Science Foundation of China & China National Petroleum Corporation Joint Fund(U1362107); National Natural Science Foundation of China-Shanxi Coal-based Low Carbon Joint Fund (U1810116); Major science and technology projects of Shanxi Provence (20181101020).

Received Date: 2020-01-27
Accepted Date: 2020-04-28
Rev Recd Date: 2020-03-10
Publish Date: 2020-04-28

Abstract

Abstract

The surface modification of multiwall carbon nanotubes (MWCTNs) was achieved by electrochemical anodic oxidation in NaOH and H₂SO₄ electrolytes. Their defect structures, functional groups, morphology and dispersibility in aqueous solutions were characterized by SEM, TEM, XPS, FTIR, Raman spectroscopy, zeta potential analysis and a stability test of their suspensions. Results indicate that anodic oxidation with the NaOH electrolyte removes more amorphous carbon, introduces fewer defects and more oxygen-containing functional groups (mainly -OH), and produces shorter nanotubes, as a result of which the resulting nanotubes are more stable when dispersed in aqueous solutions compared with those oxidized by the H₂SO₄ electrolyte. MWCTNs are more easily oxidized in the NaOH electrolyte, and the numbers of oxygen-containing functional groups and hydroxyl groups increase continuously with the oxidation degree. In the H₂SO₄ electrolyte, however, the numbers of oxygen-containing functional groups and hydroxyl groups increase and level off with the oxidation degree.
- Carbon nanotubes,
- Anodic oxidation,
- Electrolyte,
- Functionalization,
- Defect

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References(47)

References

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