Doping inhomogeneity and staging of ultra-thin graphite intercalation compound flakes probed by visible and near-infrared Raman spectroscopy

doi:10.1088/1674-1056/24/7/077804

Abstract

When ultra-thin graphite intercalation compounds (GICs) are deposited on the SiO₂/Si substrate, it is found that their colors are dependent on the thickness of GIC flakes. The sample colors of ultrathin GIC flakes can no longer provide qualitative information on the stage index. Here, multi-wavelength Raman spectroscopy is thus applied to study the doping inhomogeneity and staging of ultra-thin GICs by FeCl₃ intercalation. The G band intensity of stage-1 GIC flakes is strongly enhanced by 532-nm laser excitation, while that of stage-2 and stage-3 flakes exhibits strong intensity enhancement for 785-nm laser excitation. The near-infrared lasers are suggested to probe the doping inhomogeneity and staging of ultra-thin GIC flakes.

Keywords: ultra-thin graphite intercalation compounds Raman spectroscopy intensity enhancement doping inhomogeneity

Received: 10 January 2015
Revised: 06 February 2015
Accepted manuscript online:

PACS:	78.67.Wj	(Optical properties of graphene)
	73.22.Pr	(Electronic structure of graphene)
	81.05.ue	(Graphene)
	78.30.-j	(Infrared and Raman spectra)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11225421, 11474277, and 11434010).

Corresponding Authors: Tan Ping-Heng
E-mail: phtan@semi.ac.cn

Cite this article:

Lu Yan (鲁妍), Zhang Xin (张昕), Wu Jiang-Bin (吴江滨), Li Xiao-Li (李晓莉), Li Qiao-Qiao (厉巧巧), Tan Ping-Heng (谭平恒) Doping inhomogeneity and staging of ultra-thin graphite intercalation compound flakes probed by visible and near-infrared Raman spectroscopy 2015 Chin. Phys. B 24 077804

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Doping inhomogeneity and staging of ultra-thin graphite intercalation compound flakes probed by visible and near-infrared Raman spectroscopy

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