title: Large area films of alternating graphene-carbon nanotube layers processed in water.
abstract: We report the preparation of hybrid paperlike films consisting of alternating layers of graphene (or graphene oxide) and different types of multiwalled carbon nanotubes (N-doped MWNTs, B-doped MWNTs, and pristine MWNTs). We used an efficient self-assembly method in which nanotubes were functionalized with cationic polyelectrolytes in order to make them dispersible in water, and subsequently these suspensions were mixed with graphene oxide (GO) suspensions, and the films were formed by casting/evaporation processes. The electronic properties of these films (as produced and thermally reduced) were characterized, and we found electrical resistivities as low as 3 × 10(-4) Ω cm. Furthermore, we observed that these films could be used as electron field emission sources with extraordinary efficiencies; threshold electric field of ca. 0.55 V/μm, β factor as high as of 15.19 × 10(3), and operating currents up to 220 μA. These values are significantly enhanced when compared to previous reports in the literature for other carbon nanostructured filmlike materials. We believe these hybrid foils could find other applications as scaffolds for tissue regeneration, thermal and conducting papers, and laminate composites with epoxy resins.
authors.affiliation: Research Center for Exotic Nanocarbons (JST), and ‡Faculty of Engineering, Shinshu University , Wakasato 4-17-1, Nagano 380-8553, Japan.
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Tristán-López
authors.forename: Aaron
authors.initials: A
authors.lastname: Morelos-Gómez
authors.forename: Sofía Magdalena
authors.initials: SM
authors.lastname: Vega-Díaz
authors.forename: María Luisa
authors.initials: ML
authors.lastname: García-Betancourt
authors.forename: Néstor
authors.initials: N
authors.lastname: Perea-López
authors.forename: Ana L
authors.initials: AL
authors.lastname: Elías
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Muramatsu
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Cruz-Silva
authors.forename: Shuji
authors.initials: S
authors.lastname: Tsuruoka
authors.forename: Yoong Ahm
authors.initials: YA
authors.lastname: Kim
authors.forename: Takuya
authors.initials: T
authors.lastname: Hayahsi
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kaneko
authors.forename: Morinobu
authors.initials: M
authors.lastname: Endo
authors.forename: Mauricio
authors.initials: M
authors.lastname: Terrones