Most research into single-walled carbon nanotubes (SWNTs) has been focused on individual tubes, rather than bundles. Dr. A.C. Ferrari and colleagues at Cambridge University, however, have been investigating the electronic properties of SWNT bundles using photoluminescence (PL) spectroscopy.1 Excitons dominate the electronic structure of SWNTs, and individual nanotubes have a low quantum yield in PL, so it seemed reasonable to examine excitons in bundles of SWNTs. Using PL maps of SWNT bundles might lead to better characterization of samples of SWNTs.
1P. H. Tan, et al., “Photoluminescence Spectroscopy of Carbon Nanotube Bundles: Evidence for Exciton Energy Transfer”, Phys. Rev. Lett. 99(2007), 137402.
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