title: A study of graphene films synthesized on nickel substrates: existence and origin of small-base-area peaks.
abstract: Large-area graphene films, synthesized by the chemical vapor deposition (CVD) method, have the potential to be used as electrodes. However, the electrical properties of CVD-synthesized graphene films fall short of the best results obtained for graphene films prepared by other methods. Therefore, it is important to understand the reason why these electrical properties are inferior to improve the applicability of CVD-grown graphene films. Here, we show that CVD-grown graphene films on nickel substrates contain many small-base-area (SBA) peaks that scatter conducting electrons, thereby decreasing the Hall mobility of charges in the films. These SBA peaks were induced by small peaks on the nickel surface and are likely composed of amorphous carbon. The formation of these SBA peaks on graphene films was successfully suppressed by controlling the surface morphology of the nickel substrate. These findings may be useful for the development of a CVD synthesis method that is capable of producing better quality graphene films with large areas.
authors.affiliation: Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea. yhkahng@gist.ac.kr
authors.forename: Yung Ho
authors.initials: YH
authors.lastname: Kahng
authors.forename: Sangchul
authors.initials: S
authors.lastname: Lee
authors.forename: Minhyeok
authors.initials: M
authors.lastname: Choe
authors.forename: Gunho
authors.initials: G
authors.lastname: Jo
authors.forename: Woojin
authors.initials: W
authors.lastname: Park
authors.forename: Jongwon
authors.initials: J
authors.lastname: Yoon
authors.forename: Woong-Ki
authors.initials: WK
authors.lastname: Hong
authors.forename: Chun Hum
authors.initials: CH
authors.lastname: Cho
authors.forename: Byoung Hun
authors.initials: BH
authors.lastname: Lee
authors.forename: Takhee
authors.initials: T
authors.lastname: Lee