Directly measured optical absorption cross sections for structure-selected single-walled carbon nanotubes.
basic_science · Level V
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- Record sourced from PubMed, PMID 24502235.
- Also identified by DOI 10.1021/nl404791y.
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Abstract
We have measured peak and spectrally integrated absolute absorption cross sections for the first (E11) and second (E22) optical transitions of seven semiconducting single-walled carbon nanotube (SWCNT) species in bulk suspensions. Species-specific concentrations were determined using short-wave IR fluorescence microscopy to directly count SWCNTs in a known sample volume. Measured cross sections per atom are inversely related to nanotube diameter. E11 cross sections are larger for mod 1 species than for mod 2; the opposite is found for E22.