Abstract
We functionalized primary amine groups (NH2-) to single-walled carbon nanotubes (SWCNTs) by reacting fluorinated SWCNTs with ammonia gas at a low temperature and characterized NH2-functionalized SWCNTs which were prepared by defluorinating the remaining fluorine groups via a hydrazine treatment. It is evident from the results of the Kaiser test and X-ray photoelectron spectroscopy that a few primary amine groups were functionalized onto the nanotubes. The average number of NH2 groups in the NH2-functionalized SWCNTs was 21.5 μmol/g. One primary amine group was functionalized per about 500 carbon atoms on the outermost surface of the bundled nanotube frame. The zeta potential of the SWCNTs was found to be +14 mV (pH = 3.0) and the specific capacitance of the NH2-SWCNTs was approximately 1.7 times higher than the hc-SWCNTs at a scan rate of 10 mV/s, which indicated the functionalization effect of the primary amine groups.
Original language | English |
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Pages (from-to) | 360-371 |
Number of pages | 12 |
Journal | Carbon |
Volume | 172 |
DOIs | |
Publication status | Published - 2021 Feb |
Keywords
- Capacitance
- Fluorination
- Functionalization
- Primary amine groups
- Single-walled carbon nanotubes
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)