A comparative study on properties of multi-walled carbon nanotubes (MWCNTs) modified with acids and oxyfluorination

In this study, the surface modification of multi-walled carbon nanotubes (MWCNTs) with acid and oxyfluorination has been examined. Acid treatment of multi-walled CNTs produces many functionalized groups on the surface of MWCNTs, such as C–N stretching and the asymmetric carboxylate group (–COO–). It...

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Bibliographic Details
Published in:Journal of fluorine chemistry 2007, Vol.128 (1), p.60-64
Main Authors: Kim, Shin Dong, Kim, Ju Wan, Im, Ji Sun, Kim, Young Ho, Lee, Young Seak
Format: Article
Language:English
Subjects:
Acid treatment
Multi-walled carbon nanotubes
Oxyfluorination
Surface modification
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Summary:In this study, the surface modification of multi-walled carbon nanotubes (MWCNTs) with acid and oxyfluorination has been examined. Acid treatment of multi-walled CNTs produces many functionalized groups on the surface of MWCNTs, such as C–N stretching and the asymmetric carboxylate group (–COO–). It can be concluded that nitrogen doping of the graphite sheets may take place and a C–N bond identical to the sp 3-bonded carbon nitride may form during the acid treatment process. In addition, oxyfluorinated MWCNTs exhibit higher BET specific surface area and mesopore volume than those of the as-received and acid treated MWCNTs. Therefore, acid and oxyfluorination treatments are more effective methods for enhancing the chemical and textural properties of MWCNTs. The shape and relative intensity of Raman spectra were changed due to acid treatment and oxyfluorination. Raman spectra of (a) as-received; (b) acid treated; (c) oxyfluorinated MWCNTs. ▪
ISSN:0022-1139
1873-3328
DOI:10.1016/j.jfluchem.2006.10.010