Symmetry breaking of graphene monolayers by molecular decoration.
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.
Dong
Xiaochen
X
School of Materials Science and Engineering, Nanyang Technological University, Singapore.
Shi
Yumeng
Y
Zhao
Yang
Y
Chen
Dongmeng
D
Ye
Jun
J
Yao
Yugui
Y
Gao
Fang
F
Ni
Zhenhua
Z
Yu
Ting
T
Shen
Zexiang
Z
Huang
Yinxi
Y
Chen
Peng
P
Li
Lain-Jong
LJ