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Unique Origin of Colors of Armchair Carbon Nanotubes

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journal contribution
posted on 14.03.2012, 00:00 by Erik H. Hároz, Juan G. Duque, Benjamin Y. Lu, Pavel Nikolaev, Sivaram Arepalli, Robert H. Hauge, Stephen K. Doorn, Junichiro Kono
The colors of suspended metallic colloidal particles are determined by their size-dependent plasma resonance, while those of semiconducting colloidal particles are determined by their size-dependent band gap. Here, we present a novel case for armchair carbon nanotubes, suspended in aqueous medium, for which the color depends on their size-dependent excitonic resonance, even though the individual particles are metallic. We observe distinct colors of a series of armchair-enriched nanotube suspensions, highlighting the unique coloration mechanism of these one-dimensional metals.

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