title: Sorting centimetre-long single-walled carbon nanotubes.
abstract: While several approaches have been developed for sorting metallic (m) or semiconducting (s) single-walled carbon nanotubes (SWCNTs), the length of SWCNTs is limited within a micrometer, which restricts excellent electrical performances of SWCNTs for macro-scale applications. Here, we demonstrate a simple sorting method of centimetre-long aligned m- and s-SWCNTs. Ni particles were selectively and uniformly coated along the 1-cm-long m-SWCNTs by applying positive gate bias during electrochemical deposition with continuous electrolyte injection. To sort s-SWCNTs, the Ni coating was oxidized to form insulator outer for blocking of current flow through inner m-SWCNTs. Sorting of m-SWCNTs were demonstrated by selective etching of s-SWCNTs via oxygen plasma, while the protected m-SWCNTs by Ni coating remained intact. The series of source-drain pairs were patterned along the 1-cm-long sorted SWCNTs, which confirmed high on/off ratio of 10(4)-10(8) for s-SWCNTs and nearly 1 for m-SWCNTs.
authors.affiliation: Department of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 16419, South Korea.|Samsung-SKKU Graphene Center (SSGC), Sungkyunkwan University, Suwon 16419, South Korea.
authors.forename: Woo Jong
authors.initials: WJ
authors.lastname: Yu
authors.affiliation: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, South Korea.
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Chae
authors.affiliation: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, South Korea.|Department of Energy Science, Sungkyunkwan University, Suwon 16419, South Korea.
authors.forename: Quoc An
authors.initials: QA
authors.lastname: Vu
authors.affiliation: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, South Korea.|Department of Energy Science, Sungkyunkwan University, Suwon 16419, South Korea.|Department of Physics, Sungkyunkwan University, Suwon 16419, South Korea.
authors.forename: Young Hee
authors.initials: YH
authors.lastname: Lee