Development of a simple method for the separation of metallic and semiconducting carbon nanotubes

Due to the difficulty in the synthesis of SWNTs with a specific chirality，SWNT chirality sorting has been an anticipated technique for realizing practical applications of SWNTs especially in the field of nanoelectronic devices.We presented a novel strategy for SWNT chirality sorting；that is，a method using“nanometal sinkers”that adsorb on specific SWNTs，resulting in the separation of nanometal sinkeradsorbed SWNTs and other SWNTs by DGU。We reported that certain chiral polyfluorene copolymers can well recognize SWNT with certain chirality preferentially，leading to solubilization of specific chiral SWNTs.The chiral copolymers were prepared by the Ni-catalysed Yamamotocoupling reaction of 2，7dibromo9，9dindecylfluoreneand2，7dibromo9，9bis[(S)()2methylbutyl]fluorene comonomers.The selectivity of the SWNT chirality was mainly determined by the relative fraction of the achiral and chiral side groups.

Due to the difficulty in the synthesis of SWNTs with a specific chirality, SWNT chirality sorting has been an anticipated technique for realizing practical applications of SWNTs especially in the field of nanoelectronic devices. We presented a novel strategy for SWNT chirality sorting ; that is, a method using" nanometal sinkers" that adsorb on specific SWNTs, resulting in the separation of nanometal sinkeradsorbed SWNTs and other SWNTs by DGU. We reported that certain chiral polyfluorene copolymers can well recognize SWNT with certain chirality preferentially, leading to solubilization of specific chiral SWNTs. The chiral copolymers were prepared by the Niーcatalysed Yamamotocoupling reaction of 2, 7dibromo9, 9dindecylfluoreneand 2, 7dibromo9, 9bis[(S)(+) 2methylbutyl] fluorene comonomers. The selectivity of the SWNT chirality was mainly determined by the relative fraction of the achiral and chiral side groups.