Effects of chlorinated aromatic solvents on the dispersion of HiPco SWNTS

Qiaohun Cheng, Dublin Institute of Technology
Sourabhi Debnath, Dublin Institute of Technology
Elizabeth Gregan, Dublin Institute of Technology
Hugh Byrne, Dublin Institute of Technology

Document Type Article

Published in Physica Status Solidi (b), Vol. 245, issue 10, pp. 1947-50 (2008) http://www3.interscience.wiley.com/journal/121420238/issue


A systematic study of the effect of chlorinated aromatic solvents such as monochlorobenzene (MCB), 1,2-dichlorobenzene (o-DCB), 1,3-dichlorobenzene (m-DCB) and 1,2,4-trichlorobenzene (TCB) on the dispersion of HiPco SWNTs has been conducted. UV-Vis-NIR absorption spectroscopy coupled with an integrating sphere is employed to differentiate absorbance and scattering. An investigation of the effect of sonication time on sample preparation shows that sonication has a sig-nificant effect on the dispersion of SWNTs in organic solvents. The effect of centrifugation of the samples is also explored. For each solvent, a concentration depend-ent study demonstrates a clear transition between aggregates and dispersed tubes. A critical examination of the efficacy of the solvents in dispersing and solubilising the nanotubes is presented.