Unique Origin of Colors of Armchair Carbon Nanotubes
2012
Hároz, Erik H. | Duque, Juan G. | Lu, Benjamin Y. | Nikolaev, Pavel | Arepalli, Sivaram | Hauge, Robert H. | Doorn, Stephen K. | Kono, Junichiro
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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