title: Simultaneous transfer and doping of CVD-grown graphene by fluoropolymer for transparent conductive films on plastic.
abstract: Chemical doping can decrease sheet resistance of graphene while maintaining its high transparency. We report a new method to simultaneously transfer and dope chemical vapor deposition grown graphene onto a target substrate using a fluoropolymer as both the supporting and doping layer. Solvent was used to remove a significant fraction of the supporting fluoropolymer, but residual polymer remained that doped the graphene significantly. This contrasts with a more widely used supporting layer, polymethylmethacrylate, which does not induce significant doping during transfer. The fluoropolymer doping mechanism can be explained by the rearrangement of fluorine atoms on the graphene basal plane caused by either thermal annealing or soaking in solvent, which induces ordered dipole moments near the graphene surface. This simultaneous transfer and doping of the graphene with a fluoropolymer increases the carrier density significantly, and the resulting monolayer graphene film exhibits a sheet resistance of ∼320 Ω/sq. Finally, the method presented here was used to fabricate flexible and a transparent graphene electrode on a plastic substrate.
authors.affiliation: Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, United States.
authors.forename: Wi Hyoung
authors.initials: WH
authors.lastname: Lee
authors.forename: Ji Won
authors.initials: JW
authors.lastname: Suk
authors.forename: Jongho
authors.initials: J
authors.lastname: Lee
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Hao
authors.forename: Jaesung
authors.initials: J
authors.lastname: Park
authors.forename: Jae Won
authors.initials: JW
authors.lastname: Yang
authors.forename: Hyung-Wook
authors.initials: HW
authors.lastname: Ha
authors.forename: Shanthi
authors.initials: S
authors.lastname: Murali
authors.forename: Harry
authors.initials: H
authors.lastname: Chou
authors.forename: Deji
authors.initials: D
authors.lastname: Akinwande
authors.forename: Kwang S
authors.initials: KS
authors.lastname: Kim
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff