Surface enhanced Raman scattering of aged graphene: Effects of annealing in vacuum.
- Resource Type
- Article
- Authors
- Wang, Yingying; Ni, Zhenhua; Li, Aizhi; Zafar, Zainab; Zhang, Yan; Ni, Zhonghua; Qu, Shiliang; Qiu, Teng; Yu, Ting; Xiang Shen, Ze
- Source
- Applied Physics Letters. 12/5/2011, Vol. 99 Issue 23, p233103. 3p. 4 Graphs.
- Subject
- *GRAPHENE
*PHYSICS -- Methodology
*ATOMIC force microscopy
*SURFACE enhanced Raman effect
*CHARGE transfer
*VACUUM technology
*ANNEALING of metals
- Language
- ISSN
- 0003-6951
In this paper, we report a simple method to recover the surface enhanced Raman scattering activity of aged graphene. The Raman signals of Rhodamine molecules absorbed on aged graphene are dramatically increased after vacuum annealing and comparable to those on fresh graphene. Atomic force microscopy measurements indicate that residues on aged graphene surface can efficiently be removed by vacuum annealing, which makes target molecule closely contact with graphene. We also find that the hole doping in graphene will facilitate charge transfer between graphene and molecule. These results confirm the strong Raman enhancement of target molecule absorbed on graphene is due to the charge transfer mechanism. [ABSTRACT FROM AUTHOR]