title: Flexible graphene-graphene composites of superior thermal and electrical transport properties.
abstract: Graphene is known for high thermal and electrical conductivities. In the preparation of neat carbon materials based on graphene, a common approach has been the use of well-exfoliated graphene oxides (GOs) as the precursor, followed by conversion to reduced GOs (rGOs). However, rGOs are more suitable for the targeted high electrical conductivity achievable through percolation but considerably less effective in terms of efficient thermal transport dictated by phonon progression. In this work, neat carbon films were fabricated directly from few-layer graphene sheets, avoiding rGOs completely. These essentially graphene-graphene composites were of a metal-like appearance and mechanically flexible, exhibiting superior thermal and electrical transport properties. The observed thermal and electrical conductivities are higher than 220 W/m · K and 85000 S/m, respectively. Some issues in the further development of these mechanically flexible graphene-graphene nanocomposite materials are discussed and so are the associated opportunities.
authors.affiliation: Department of Chemistry and Laboratory for Emerging Materials and Technology, Clemson University , Clemson, South Carolina 29634-0973, United States.
authors.forename: Zhi-Ling
authors.initials: ZL
authors.lastname: Hou
authors.forename: Wei-Li
authors.initials: WL
authors.lastname: Song
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Mohammed J
authors.initials: MJ
authors.lastname: Meziani
authors.forename: Chang Yi
authors.initials: CY
authors.lastname: Kong
authors.forename: Ankoma
authors.initials: A
authors.lastname: Anderson
authors.forename: Halidan
authors.initials: H
authors.lastname: Maimaiti
authors.forename: Gregory E
authors.initials: GE
authors.lastname: LeCroy
authors.forename: Haijun
authors.initials: H
authors.lastname: Qian
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Sun
keywords: composite film; electrical conductivity; flexible composite; graphene; graphene oxide; thermal conductivity