title: Air-tolerant Fabrication and Enhanced Thermoelectric Performance of n-Type Single-walled Carbon Nanotubes Encapsulating 1,1'-Bis(diphenylphosphino)ferrocene.
abstract: The thermally-triggered n-type doping of single-walled carbon nanotubes is demonstrated using 1,1'-bis(diphenylphosphino)ferrocene, a novel n-type dopant. Through a simple thermal vacuum process, the phosphine compounds are moderately encapsulated inside single-walled carbon nanotubes. The encapsulation into SWNTs is carefully characterized using Raman/X-ray spectroscopy and transmission electron microscopy. This easy-to-handle doping with air-stable precursors for n-type SWNTs enables the large-scale fabrication of thermoelectric materials showing an excellent power factor exceeding approximately 240 μW mK(-2) .
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, 630-0192, Japan. nonoguchi@ms.naist.jp.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nonoguchi
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, 630-0192, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Iihara
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, 630-0192, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Ohashi
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, 630-0192, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Murayama
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, 630-0192, Japan. tkawai@ms.naist.jp.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kawai
keywords: charge carrier injection; doping; energy conversion; nanotubes; thermoelectric materials