Later an organic solvent assisted surfactant exchange experiment was performed to receive DOC dispersed SWCNTs for ATPE . In detail, a certain volume of acetonitrile was mixed with SDBS-dSWCNTs solution to precipitate SWCNTs, then it was washed with water to remove residual SDBS. Finally, the SWCNTs were redispersed with 1% DOC solution, tip sonicated for 5 min and centrifuged at 21000 g. The DOC-dSWCNT solution was obtained by collecting the supernatant.