Protonation of carbon single-walled nanotubes studied using 13C and 1H-13C cross polarization nuclear magnetic resonance and Raman spectroscopies

被引:62
作者
Engtrakul, C [1 ]
Davis, MF
Gennett, T
Dillon, AC
Jones, KM
Heben, MJ
机构
[1] Natl Renewable Energy Lab, Ctr Basic Sci, Golden, CO 80401 USA
[2] Natl Renewable Energy Lab, Natl Bioenergy Ctr, Golden, CO 80401 USA
[3] Rochester Inst Technol, Dept Chem, Rochester, NY 14623 USA
[4] Natl Renewable Energy Lab, Natl Ctr Photovolta, Golden, CO 80401 USA
关键词
D O I
10.1021/ja0557886
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The reversible protonation of carbon single-walled nanotubes (SWNTs) in sulfuric acid and Nafion was investigated using solid-state nuclear magnetic resonance (NMR) and Raman spectroscopies. Magic-angle spinning (MAS) was used to obtain high-resolution C-13 and H-1-C-13 cross polarization (CP) NMR spectra. The C-13 NMR chemical shifts are reported for bulk SWNTs, H2SO4-treated SWNTs, SWNT-Nafion polymer composites, SWNT-AQ55 polymer composites, and SWNTs in contact with water. Protonation occurs without irreversible oxidation of the nanotube substrate via a charge-transfer process. This is the first report of a chemically induced change in a SWNT C-13 resonance brought about by a reversible interaction with an acidic proton, providing additional evidence that carbon nanotubes behave as weak bases. Cross polarization was found to be a powerful technique for providing an additional contrast mechanism for studying nanotubes in contact with other chemical species. The CP studies confirmed polarization transfer from nearby protons to nanotube carbon atoms. The CP technique was also applied to investigate water adsorbed on carbon nanotube surfaces. Finally, the degree of bundling of the SWNTs in Nafion films was probed with the H-1-C-13 CP-MAS technique.
引用
收藏
页码:17548 / 17555
页数:8
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