title: Symmetry breaking of graphene monolayers by molecular decoration.
abstract: Aromatic molecules can effectively exfoliate graphite into graphene monolayers, and the resulting graphene monolayers sandwiched by the aromatic molecules exhibit a pronounced Raman G-band splitting, similar to that observed in single-walled carbon nanotubes. Raman measurements and calculations based on the force-constant model demonstrate that the absorbed aromatic molecules are responsible for the G-band splitting by removing the energy degeneracy of in-plane longitudinal and transverse optical phonons at the Gamma point.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Singapore.
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Dong
authors.forename: Yumeng
authors.initials: Y
authors.lastname: Shi
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Dongmeng
authors.initials: D
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Ye
authors.forename: Yugui
authors.initials: Y
authors.lastname: Yao
authors.forename: Fang
authors.initials: F
authors.lastname: Gao
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Ni
authors.forename: Ting
authors.initials: T
authors.lastname: Yu
authors.forename: Zexiang
authors.initials: Z
authors.lastname: Shen
authors.forename: Yinxi
authors.initials: Y
authors.lastname: Huang
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li