In aqueous suspension with surfactants
"Investigation of Sodium Dodecyl Benzene Sulphonate Assisted Dispersion and Debundling of Single Wall Carbon Nanotubes." Priya Baskar Rao, Hugh J. Byrne, Journal of Physical Chemistry C, 12, 332-337 (2008) .
Also organic solvents
"Effect of solvent solubility parameters on the dispersion of Single-walled carbon nanotubes"
Qiaohuan Cheng, Sourabhi Debnath, Elizabeth Gregan, Hugh J. Byrne, J. Phys. Chem. C, 112, 20154-20158 (2008)
Many techniques like Surfactants, density gradient centrifugation etc.. See this review article by Mark Hersam's lab. doi:10.1038/nnano.2008.135
What do you mean by "mono-disperse"? Do you mean individually dispersed nanotubes, length sorted, single chirality...? Also, what is the medium of interest? Many techniques are suitable in specific solvents, but are no longer effective if you transfer the material to, for example, a polymer matrix or deposit as an ink. There are techniques for each of the above cases, but they vary widely. I have a few papers on dispersion techniques to obtain individual nanotubes in various media if you are interested, but they do not address the polydispersity in length or chirality. The citations above are more suited for that (a lot of work out of NIST looked at using surfactants for size sorting, I recall; look for work by Erik Hobbie).
If you want to obtain super dispersed CNTs use chlorosulfonic acid - 5 minutes in room temp without sonication or stirring and bundles dissapears. However, the mixture is hard to handle and dangerous. I done it only once for UV-Vis-NIR measurements and M11 was not visible due to CNTs charged surface.
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