PROBLEM TO BE SOLVED: To provide a nano-extraction method and a nano-condensation method for the incorporation of guest molecules into a single-wall carbon nanotube.
SOLUTION: The nano-extraction method comprises putting the below-mentioned guest molecules in a solvent, ultrasonicating the solution, adding one or a plurality of single-wall carbon nanotubes with opened tips and wall holes, and stabilizing the mixture to reach a state in which the guest molecules are incorporated into the single-wall carbon nanotubes to effect extraction. The above-mentioned guest molecules have a poor affinity for the solvent and a strong affinity for a single-wall carbon nanotube. The attractive force between the guest molecules and the single-wall carbon nanotube is greater than that between the guest molecule and the solvent and that between the solvent and the single-wall carbon nanotube. The nano-condensation method comprises dropping a saturated solution including a solvent and guest molecules having strong affinity for the solvent and strong affinity for the single-wall carbon nanotube onto one or a plurality of single-wall carbon nanotubes placed on a grid disk laid on a filter paper for sucking up the excess solution to effect condensation.