Polymer Structure and Solvent Effects on the Selective Dispersion of Single-Walled Carbon Nanotubes

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• 作者：Jeong-Yuan Hwang ; Adrian Nish ; James Doig ; Sigrid Douven ; Chun-Wei Chen ; Li-Chyong Chen ; Robin J. Nicholas
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：March 19, 2008
• 年：2008
• 卷：130
• 期：11
• 页码：3543 - 3553
• 全文大小：1326K
• 年卷期：v.130,no.11(March 19, 2008)
• ISSN：1520-5126

文摘

Combinations of different aromatic polymers and organic solvents have been studied as dispersingagents for preparing single-walled carbon nanotubes solutions, using optical absorbance, photoluminescence-excitation mapping, computer modeling, and electron microscopic imaging to characterize thesolutions. Both the polymer structure and solvent used strongly influence the dispersion of the nanotubes,leading in some cases to very high selectivity in terms of diameter and chiral angle. The highest selectivitiesare observed using toluene with the rigid polymers PFO-BT and PFO to suspend isolated nanotubes. Thespecific nanotube species selected are also dependent on the solvent used and can be adjusted by theuse of THF or xylene. Where the structure has more flexible conformations, the polymers are shown to beless selective but show an enhanced overall solubilization of nanotube material. When chloroform is usedas the solvent, there is a large increase in the overall solubilization, but the nanotubes are suspended asbundles rather than as isolated tubes which leads to a quenching of their photoluminescence.