Separation of Armchair SWNTs by Using Polymer Conformation Guided Assembly
Final rept. 1 Jun 2010-31 May 2013
AKRON UNIV OH DEPT OF CHEMISTRY
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Isolation of single-walled carbon nanotubes SWNTs remains to be a key step for realization of the true potential of SWNTs, since the physical properties of SWNTs are dependent on the tube s chirality index n, m. Polymers with enhanced helical conformation are found to be an efficient sorting mechanism for SWNTs, as the cavity of polymer s helical conformation can be tailored to facilitate an intimate interaction between polymer and SWNTs. Polym-phenylenevinylene PmPV demonstrates that the polymer helical conformation can be controlled to sort the SWNTs by their diameters. Polym-phenyleneethynylene-alt-p-phenyleneethynylene PPE reveals the intriguing selectivity toward tube 6,5, illustrating the impact of carbon-carbon triple bonds on the SWNTs selectivity. In another approach, polyethyleneimine PEI is found to exhibit selective interaction with semiconducting SWNTs. By using this property, cellulose impregnated with PEI is found to be a column packing materials for separation of metallic SWNTs from a raw HiPco sample. Analysis by AFM, 2D fluorescence and UV-vis-NIR absorption spectra suggests that the metallic SWNTs 13,4 can be separated from the armchair SWNTs 10,10 and 9,9.
- Refractory Fibers