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Originally published in Science Express on 29 November 2002
Science 20 December 2002:
Vol. 298. no. 5602, pp. 2361 - 2366
DOI: 10.1126/science.1078727
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Reports

Structure-Assigned Optical Spectra of Single-Walled Carbon Nanotubes

Sergei M. Bachilo,1 Michael S. Strano,1 Carter Kittrell,1 Robert H. Hauge,1 Richard E. Smalley,12 R. Bruce Weisman1*

Spectrofluorimetric measurements on single-walled carbon nanotubes (SWNTs) isolated in aqueous surfactant suspensions have revealed distinct electronic absorption and emission transitions for more than 30 different semiconducting nanotube species. By combining these fluorimetric results with resonance Raman data, each optical transition has been mapped to a specific (n,m) nanotube structure. Optical spectroscopy can thereby be used to rapidly determine the detailed composition of bulk SWNT samples, providing distributions in both tube diameter and chiral angle. The measured transition frequencies differ substantially from simple theoretical predictions. These deviations may reflect combinations of trigonal warping and excitonic effects.

1 Department of Chemistry, Center for Nanoscale Science and Technology, and Center for Biological and Environmental Nanotechnology, Rice University, 6100 Main Street, Houston, TX 77005, USA.
2 Department of Physics, Rice University, 6100 Main Street, Houston, TX 77005, USA.
*   To whom correspondence should be addressed. E-mail: weisman{at}rice.edu

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