Crochet, Jared and Clemens, Michael and Hertel, Tobias (2007) Quantum yield heterogeneities of aqueous single-wall carbon nanotube suspensions. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 129 (26). 8058+.
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Official URL: http://dx.doi.org/10.1021/ja071553d
Aqueous suspensions of single-wall carbon nanotubes (SWNTs) prepared by traditional methods from the supernatant of ultracentrifuged micellar SWNT mixtures are shown to be strongly heterogeneous with respect to the quantum yield of their constituents. The heterogeneities are isolated using preparative ultracentrifugation in iodixanol density gradients and are optically characterized by photoluminescence and linear absorption spectroscopy. We find that the most buoyant fractions with a density of 1.055 +/- 0.005 g center dot cm(-3) have the highest photoluminescence quantum yield eta of 1.1%, a factor of 5 higher than that of the supernatant. Denser fractions with lower eta make up for about (2)/(3) of these samples and contain mostly small ropes in which the quantum yield is reduced by nonradiative decay through coupling to metallic tubes.
|Subjects:||Physical Science > Nano objects|
Material Science > Nanostructured materials
Material Science > Nanochemistry
|Deposited By:||Anuj Seth|
|Deposited On:||13 Jan 2009 12:28|
|Last Modified:||20 Jan 2009 14:51|
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