Method for separating semiconducting carbon nanotubes, and mixed solution, and dispersion of semiconducting carbon nanotubes
To reduce cost for the method for separating semiconducting carbon nanotube from a mixture of metallic and semiconducting carbon nanotubes. The separation method includes preparing a dispersion by mixing a first substance, a second substance, SDS, SC, and a mixture of metallic and semiconducting carbon nanotubes with a solvent, wherein the dispersion into two layers, which are a first layer mainly containing the first substance and a second layer mainly containing the second substance, whereby the semiconducting carbon nanotube is transferred into the first layer, and the metallic carbon nanotube is transferred into the second layer, wherein the first substance is an α-glucan which is composed of glucose linked via α-glucosidic linkage and which has a weight average molecular weight Mw of 4,000 to 7,000 and has a ratio in amount of α-1, 6 linked glucose residues to the entire glucose residues of 40 to 70%.
1. A semiconducting carbon nanotube separation method characterized in that the method comprises
a first step of mixing a first substance, a second substance which undergoes two-phase separation when mixed with the first substance in a state of solution, an alkyl chain-containing surfactant, a steroidal surfactant, and a mixture of metallic and semiconducting carbon nanotubes with a solvent, to thereby prepare a dispersion; and
a second step of separating the dispersion into two layers, which are a first layer mainly containing the first substance and a second layer mainly containing the second substance, whereby the semiconducting carbon nanotube is transferred into one of the first layer and the second layer, and the metallic carbon nanotube is transferred into the other of the first layer and the second layer, wherein
the first substance is an α-glucan which is composed of glucose linked via α-glucosidic linkage and which has a weight average molecular weight Mw of 4,000 to 7,000 and has a ratio in amount of α-1,6 linked glucose residues to the entire glucose residues of 40 to 70%.
2. The semiconducting carbon nanotube separation method according to claim 1 , wherein the first step includes
mixing the first substance, the second substance, the alkyl chain-containing surfactant, and the steroidal surfactant with the solvent, to thereby prepare a mixed solution; and,
subsequently, adding the mixture of metallic and semiconducting carbon nanotubes to the mixed solution, to thereby prepare a dispersion.
3. The semiconducting carbon nanotube separation method according to claim 1 , wherein the first substance is an α-glucan having a structure in which glucose units are continuously linked via α-1,6 linkages.