Bergin, Shane D. and Nicolosi, Valeria and Cathcart, Helen and Lotya, Mustafa and Rickard, David and Sun, Zhenyu and Blau, Werner J. and Coleman, Jonathan N. (2008) Large populations of individual nanotubes in surfactant-based dispersions without the need for ultracentrifugation. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (4). pp. 972-977.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp076915i
Stable dispersions of single-walled carbon nanotubes have been produced using the surfactant sodium dodecylbenzene sulfonate (SDBS). Atomic force microscopy analysis. shows that, on dilution of these dispersions, the nanotubes exfoliate from bundles, resulting in a concentration-dependent bundle diameter distribution which saturates at D-rms approximate to 2 nm for concentrations, C-NT < 0.05 mg/mL. The total bundle number density increases with concentration, saturating at similar to 6 bundles per mu m(3) for C-NT > 0.05 mg/mL. As the concentration is reduced the number fraction of individual nanotubes grows, approaching 50% at low concentration. In addition, partial concentrations of individual SWNTs approaching 0.01 mg/mL can be realized. These values are far superior to those for solvent dispersions due to repulsion stabilization of the surfactant-coated nanotubes. These methods facilitate the preparation of high-quality nanotube dispersions without the need for ultracentrifugation, thus significantly increasing the yield of dispersed nanotubes.
|Subjects:||Physical Science > Nano objects|
Technology > Manufacturing processes for nanotechnology
|Deposited On:||20 Jan 2009 13:27|
|Last Modified:||20 Jan 2009 13:27|
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