Unique origin of colors of armchair carbon nanotubes |
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Authors: | Hároz Erik H Duque Juan G Lu Benjamin Y Nikolaev Pavel Arepalli Sivaram Hauge Robert H Doorn Stephen K Kono Junichiro |
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Affiliation: | Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States. |
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Abstract: | 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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