title: Large-scale plasma patterning of transparent graphene electrode on flexible substrates.
abstract: Graphene, a two-dimensional carbon material, has attracted significant interest for applications in flexible electronics as an alternative transparent electrode to indium tin oxide. However, it still remains a challenge to develop a simple, reproducible, and controllable fabrication technique for producing homogeneous large-scale graphene films and creating uniform patterns with desired shapes at defined positions. Here, we present a simple route to scalable fabrication of flexible transparent graphene electrodes using an oxygen plasma etching technique in a capacitively coupled plasma (CCP) system. Ascorbic acid-assisted chemical reduction enables the large-scale production of graphene with solution-based processability. Oxygen plasma in the CCP system facilitates the reproducible patterning of graphene electrodes, which allows controllable feature sizes and shapes on flexible plastic substrates. The resulting graphene electrode exhibits a high conductivity of 80 S cm(-1) and a transparency of 76% and retains excellent flexibility upon hard bending at an angle of ±175° and after repeated bending cycles. A simple LED circuit integrated on the patterned graphene film demonstrates the feasibility of graphene electrodes for use in flexible transparent electrodes.
authors.affiliation: Department of Bionano Engineering, ‡Department of Chemical Engineering, and §Department of Materials Engineering, Hanyang University , Ansan 425-791, South Korea.
authors.forename: Ji Hye
authors.initials: JH
authors.lastname: Kim
authors.forename: Euna
authors.initials: E
authors.lastname: Ko
authors.forename: Joonki
authors.initials: J
authors.lastname: Hwang
authors.forename: Xuan-Hung
authors.initials: XH
authors.lastname: Pham
authors.forename: Joo Heon
authors.initials: JH
authors.lastname: Lee
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Van-Khue
authors.initials: VK
authors.lastname: Tran
authors.forename: Jong-Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Jin-Goo
authors.initials: JG
authors.lastname: Park
authors.forename: Jaebum
authors.initials: J
authors.lastname: Choo
authors.forename: Kwi Nam
authors.initials: KN
authors.lastname: Han
authors.forename: Gi Hun
authors.initials: GH
authors.lastname: Seong
mesh_terms: D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D055595:Mechanical Phenomena; D055620:Optical Phenomena; D010087:Oxides / Q000737:chemistry; D058626:Plasma Gases / Q000737:chemistry*
chemical_list: D010087:Oxides; D058626:Plasma Gases; D006108:Graphite