title: Super-stretchable graphene oxide macroscopic fibers with outstanding knotability fabricated by dry film scrolling.
abstract: Graphene oxide (GO) has recently become an attractive building block for fabricating graphene-based functional materials. GO films and fibers have been prepared mainly by vacuum filtration and wet spinning. These materials exhibit relatively high Young's moduli but low toughness and a high tendency to tear or break. Here, we report an alternative method, using bar coating and drying of water/GO dispersions, for preparing large-area GO thin films (e.g., 800-1200 cm(2) or larger) with an outstanding mechanical behavior and excellent tear resistance. These dried films were subsequently scrolled to prepare GO fibers with extremely large elongation to fracture (up to 76%), high toughness (up to 17 J/m(3)), and attractive macroscopic properties, such as uniform circular cross section, smooth surface, and great knotability. This method is simple, and after thermal reduction of the GO material, it can render highly electrically conducting graphene-based fibers with values up to 416 S/cm at room temperature. In this context, GO fibers annealed at 2000 °C were also successfully used as electron field emitters operating at low turn on voltages of ca. 0.48 V/μm and high current densities (5.3 A/cm(2)). Robust GO fibers and large-area films with fascinating architectures and outstanding mechanical and electrical properties were prepared with bar coating followed by dry film scrolling.
authors.affiliation: Research Center for Exotic Nanocarbons and ‡Faculty of Engineering, Shinshu University , 4-17-1 Wakasato, Nagano 380-8553, Japan.
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Cruz-Silva
authors.forename: Aaron
authors.initials: A
authors.lastname: Morelos-Gomez
authors.forename: Hyung-Ick
authors.initials: HI
authors.lastname: Kim
authors.forename: Hong-Kyu
authors.initials: HK
authors.lastname: Jang
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Tristan
authors.forename: Sofia
authors.initials: S
authors.lastname: Vega-Diaz
authors.forename: Lakshmy P
authors.initials: LP
authors.lastname: Rajukumar
authors.forename: Ana Laura
authors.initials: AL
authors.lastname: Elías
authors.forename: Nestor
authors.initials: N
authors.lastname: Perea-Lopez
authors.forename: Jonghwan
authors.initials: J
authors.lastname: Suhr
authors.forename: Morinobu
authors.initials: M
authors.lastname: Endo
authors.forename: Mauricio
authors.initials: M
authors.lastname: Terrones