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

Lu Yan, Zhang Xin, Wu Jiang-Bin, Li Xiao-Li, Li Qiao-Qiao, Tan Ping-Heng†

Multi-wavelength Raman spectra at SA (a), SB (b), and SC (c). For a specific λ _ex, all the Raman spectra are normalized by I (G1) at SA. Gray-dashed lines show the fits to the G band by Lorentzian peaks.