Figure 4. Separated single-chirality and metallic SWCNTs.

(a) Optical absorption spectra of 13 (n, m) semiconducting species together with those of metallic and pristine HiPco mixtures. The spectra are ranked according to interaction strength between the (n, m) species and the gel (that is, their separation order), as indicated by the arrow. (b) Photographs of various (n, m) species, showing their distinct colours. (c) Photoluminescence contour maps of separated (n, m) fractions. Each fraction is highly enriched with a single semiconducting species.