Metal/semiconductor separation of single-wall carbon nanotubes by selective adsorption and desorption for agarose gel

Metallic and semiconducting single‐wall carbon nanotubes (SWCNTs) were separated by selective adsorption and desorption using agarose gel beads and SWCNTs/sodium dodecyl sulfate dispersion. Comparison to the batch method, the purities of metallic and semiconducting SWCNTs obtained by a column method were improved to 90 and 95%, respectively. When linear‐gradient elution was applied to the column method, semiconducting SWCNTs and presumed mixed bundles could be separated into early‐ and late‐eluted fractions, respectively. In the semiconducting fractions, chirality separation was also detected.