title: Magnetic nanoparticle-based separation of metallic and semiconducting carbon nanotubes.
abstract: We report a simple and scalable method for the separation of semiconducting single-walled carbon nanotubes (SWNTs) from metallic SWNTs using magnetic nanoparticles (MNPs) functionalized with polycationic tri-aminated polysorbate 80 (TP80). MNPs-TP80 are selectively adsorbed on acid-treated semiconducting SWNTs, which makes the semiconducting SWNTs be highly concentrated to over 95% under a magnetic field. Almost all the field effect transistor network devices, which were fabricated using separated semiconducting SWNTs, exhibited a p-type semiconducting behavior with an on/off ratio of higher than 10(4).
authors.affiliation: Nanomedical Graduate Program, Yonsei University, Seoul 120-749, Republic of Korea.
authors.forename: Hyung Joon
authors.initials: HJ
authors.lastname: Kim
authors.forename: Sungsic
authors.initials: S
authors.lastname: Hwang
authors.forename: Jeseung
authors.initials: J
authors.lastname: Oh
authors.forename: Young Wook
authors.initials: YW
authors.lastname: Chang
authors.forename: Eun-Kyung
authors.initials: EK
authors.lastname: Lim
authors.forename: Seungjoo
authors.initials: S
authors.lastname: Haam
authors.forename: Chul Sung
authors.initials: CS
authors.lastname: Kim
authors.forename: Kyung-Hwa
authors.initials: KH
authors.lastname: Yoo
mesh_terms: D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D011136:Polysorbates / Q000737:chemistry; D012666:Semiconductors
chemical_list: D008670:Metals; D037742:Nanotubes, Carbon; D011136:Polysorbates