Selective Dispersion of Single-Walled Carbon Nanotubes with Specific Chiral Indices by Poly(N-decyl-2,7-carbazole) Institut für Nanotechnologie, Karisruher.
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| Title: | Selective Dispersion of Single-Walled Carbon Nanotubes with Specific Chiral Indices by Poly(N-decyl-2,7-carbazole) Institut für Nanotechnologie, Karisruher. |
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| Authors: | Lemasson, Fabien A.1, Strunk, Timo1, Gerstel, Peter1, Hennrich, Frank2, Lebedkin, Sergei1, Barner-Kowollik2, Christopher, Wenzel, Wolfgang1,3,4, Kappes, Manfred M.1,3,4,5, Mayor, Marcel1,2,3,4 |
| Source: | Journal of the American Chemical Society. 2/2/2011, Vol. 133 Issue 4, p652-655. 4p. |
| Subjects: | Carbon nanotubes, Chirality, Centrifugation, Carbazole, Fluorene, Photoluminescence, Spectrum analysis, Polymer research |
| Abstract: | Physico-chemical methods to sort single- walled carbon nanotubes (SWNTs) by chiral index are presently lacking but are required for in-depth experimental analysis and also for potential future applications of specific species. Here we report the unexpected selectivity of poiy- (N-decyl-2,7-carbazole) to almost exclusively disperse semi- conducting SWNTs with differences of their chiral indices (n - m) 2 in toluene. The observed selectivity comple- ments perfectly the dispersing features of the fluorene analogue poly(9,9-dialkyl-2,7-fluorene), which disperses semiconducting SWNTs with (n - m) S 2 in toluene. The dispersed samples are further purified by density gradient centnfugation and analyzed by photoluminescence excitation spectroscopy. All-atom molecular modeling with decamer model compounds of the polymers and (10,2) and (7,6) SWNTs suggests differences in the Л - Л stacking interaction as origin of the selectivity. We observe energet- ically favored complexes between the (10,2) SWNT and the carbazole decamer and between the (7,6) SWNT and the fluorene decamer, respectively. These findings demon- strate that subtle structural changes of polymers lead to selective solvation of different families of carbon nanotubes. Furthermore, chemical screening of closely related polymers may pave the way toward simple, low-cost, and index-specific isolation of SWNTs. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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