title: Layer-by-layer doping of few-layer graphene film.
abstract: We propose a new method of layer-by-layer (LbL) doping of thin graphene films. Large area monolayer graphene was synthesized on Cu foil by using the chemical vapor deposition method. Each layer was transferred on a polyethylene terephthalate substrate followed by a salt-solution casting, where the whole process was repeated several times to get LbL-doped thin layers. With this method, sheet resistance was significantly decreased up to approximately 80% with little sacrifice in transmittance. Unlike samples fabricated by topmost layer doping, our sample shows better environmental stability due to the presence of dominant neutral Au atoms on the surface which was confirmed by angle-resolved X-ray photoelectron spectroscopy. The sheet resistance of the LbL-doped four-layer graphene (11 x 11 cm(2)) was 54 Omega/sq at 85% transmittance, which meets the technical target for industrial applications.
authors: BK21 Physics Division, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, South Korea.
authors: Fethullah
authors: F
authors: Güneş
authors: Hyeon-Jin
authors: HJ
authors: Shin
authors: Chandan
authors: C
authors: Biswas
authors: Gang Hee
authors: GH
authors: Han
authors: Eun Sung
authors: ES
authors: Kim
authors: Seung Jin
authors: SJ
authors: Chae
authors: Jae-Young
authors: JY
authors: Choi
authors: Young Hee
authors: YH
authors: Lee