Symmetry Breaking of Graphene Monolayers by Molecular Decoration

Xiaochen Dong, Yumeng Shi, Yang Zhao, Dongmeng Chen, Jun Ye, Yugui Yao, Fang Gao, Zhenhua Ni, Ting Yu, Zexiang Shen, Yinxi Huang, Peng Chen, and Lain-Jong Li
Phys. Rev. Lett. 102, 135501 – Published 31 March 2009

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 Γ point.

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  • Received 14 October 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.135501

©2009 American Physical Society

Authors & Affiliations

Xiaochen Dong1,4, Yumeng Shi1, Yang Zhao1, Dongmeng Chen1, Jun Ye1, Yugui Yao5, Fang Gao1, Zhenhua Ni2, Ting Yu2, Zexiang Shen2, Yinxi Huang3, Peng Chen3,*, and Lain-Jong Li1,*

  • 1School of Materials Science and Engineering, Nanyang Technological University, Singapore
  • 2School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
  • 3School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
  • 4Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing, China
  • 5Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • *ljli@ntu.edu.sg; ChenPeng@ntu.edu.sg

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Vol. 102, Iss. 13 — 3 April 2009

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