Patent ID: 8102524

Claim:
A method of determining a degree of dispersion corresponding to a ratio of single-walled carbon nanotubes that do not form aggregates and are in an isolated state within single-walled carbon nanotubes contained in a carbon nanotube-containing substance, comprising: detecting Raman scattering light generated by projecting monochromatic light into a carbon nanotube-containing substance; measuring an intensity of the Raman scattering light corresponding to a predetermined Raman shift corresponding to said monochromatic light; and on the basis of the measured intensity of the Raman scattering light, determining a degree of dispersion of the single-walled carbon nanotubes in said carbon nanotube-containing substance, wherein an energy of the monochromatic light projected into said carbon nanotube-containing substance is 1.9±0.1 eV, and said predetermined Raman shift is 210 to 230 cm −1 in the wave number unit.