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Dispersion of nitric acid-treated SWNTs in organic solvents and solvent mixtures.

Research paper by Geon-Woong GW Lee, Satish S Kumar

Indexed on: 21 Jul '06Published on: 21 Jul '06Published in: Journal of Physical Chemistry B



Abstract

The dispersion of pristine and nitric acid-treated single-wall carbon nanotubes (SWNTs) has been studied in organic solvents and solvent mixtures using optical absorption, as a function of settling time. The extinction coefficients of both the pristine and acid-treated tubes at 500-nm wavelength was measured to be 25.5 (mg/L)(-1) cm(-1) in various solvents. The dispersibility of nitric acid-treated tubes increased with the solvent's hydrogen-bonding ability and reached 27 mg/L in ethanol and 35 mg/L in water. Nitric acid-treated tubes could also be dispersed in butanol/toluene and xylene/ethanol mixtures, which are known to be poor solvents for the pristine SWNTs.