title: Highly conductive graphene nanoribbons by longitudinal splitting of carbon nanotubes using potassium vapor.
abstract: Here we demonstrate that graphene nanoribbons (GNRs) free of oxidized surfaces can be prepared in large batches and 100% yield by splitting multiwalled carbon nanotubes (MWCNTs) with potassium vapor. If desired, exfoliation is attainable in a subsequent step using chlorosulfonic acid. The low-defect density of these GNRs is indicated by their electrical conductivity, comparable to that of graphene derived from mechanically exfoliated graphite. The possible origins of directionally selective splitting of MWCNTs have been explored using computer modeling, and plausible explanations for the unique role of potassium were found.
authors.affiliation: Richard E. Smalley Institute for Nanoscale Science and Technology, Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas, 77005, USA.
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Kosynkin
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.forename: Alexander
authors.initials: A
authors.lastname: Sinitskii
authors.forename: Gorka
authors.initials: G
authors.lastname: Pera
authors.forename: Zhengzong
authors.initials: Z
authors.lastname: Sun
authors.forename: James M
authors.initials: JM
authors.lastname: Tour